Conceptual Model

This provides a reference of information entities and relationships relevant to the ATM operational discourse. It is intended for use by operational experts. It can be used, for example, in disambiguating terms used in operational documents and developing information exchange requirements.

4DPoint

Point described by three-dimensional (3D) coordinates and a time.

Source:
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Common:Geometry:4DPoint

Associations:

Name Type
described by Time


4DTrajectory

A four-dimensional (x, y, z, and time) trajectory of an aircraft from gate-to-gate, at the level of fidelity required for attaining the agreed ATM system performance levels.

Source: ICAO Doc 9965;
Synonyms: Trajectory
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:Movement:4DTrajectory

Associations:

Name Type
has AlongRouteDistance
is expressed as TrajectoryPoint
has CruisingSpeed
has CruisingLevel
has TotalEstimatedElapsedTime
has EnRouteDelay
has SpeedSchedule
has PerformanceProfile
has EstimatedTakeOffWeight


AccelerateStopDistanceAvailable

The length of the take-off run available plus the length of the stopway, if provided.

Source: ICAO Annex 14;
Abbreviations: ASDA
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:AccelerateStopDistanceAvailable


AcceptanceMessage

A message transmitted by an accepting unit to the transferring unit to indicate that the data in a current flight plan or estimate message is accepted.

It shall also be transmitted to indicate that the data received in a coordination message is accepted and that the coordination dialogue is completed.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:InformationServicesProducts:FlightInformationProduct:AcceptanceMessage

Associations:

Name Type
indicates acceptance of conditions in CoordinationAndTransfer


AcceptingUnitOrController

Air traffic control unit next to take control of an aircraft.

Source: ICAO Annex 1; ICAO Annex 11; ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:Role:AcceptingUnitOrController

Associations:

Name Type
initially is ReceivingUnitOrController
during dialogue may be SendingUnitOrController
consents with CoordinationAndTransfer


Accuracy

A degree of conformance between the estimated or measured value and the true value.

Source: ICAO Annex 1; ICAO Annex 11; ICAO Annex 14; ICAO Annex 15;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:InformationServicesProducts:AeronauticalInformationProduct:Accuracy


AcrobaticFlight

Manoeuvres intentionally performed by an aircraft involving an abrupt change in its attitude, an abnormal attitude, or an abnormal variation in speed.

Source: ICAO Annex 2;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:AcrobaticFlight


AdvisoryAirspace

An airspace of defined dimensions, or designated route, within which air traffic advisory service is available.

Source: ICAO Annex 1; ICAO Annex 11; ICAO Annex 2;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:Airspace:AdvisoryAirspace

Associations:

Name Type
can be AdvisoryArea
can correspond to ATSRoute


AdvisoryArea

A designated area within a flight information region where air traffic advisory service is available.

Source: ICAO Doc 9426;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:Airspace:AdvisoryArea


AerialRefuelling

A procedure used by the military to transfer fuel from one aircraft to another during flight.

Source: EUROCONTROL-FAA AIXM v.5.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:RouteAndProcedure:AerialRefuelling

Associations:

Name Type
has RouteLayout
has RouteLayout


AerialWork

An aircraft operation in which an aircraft is used for specialized services such as agriculture, construction, photography, surveying, observation and patrol, search and rescue, aerial advertisement, etc.

Source: ICAO Annex 1; ICAO Annex 17; ICAO Annex 6;
Abbreviations: AW
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:AerialWork


Aerodrome

A defined area on land or water (including any buildings, installations and equipment) intended to be used either wholly or in part for the arrival, departure and surface movement of aircraft.

Source: ICAO; ICAO Annex 1; ICAO Annex 15;
Synonyms: AirportHeliport
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:Aerodrome

Associations:

Name Type
has AerodromeReferencePoint
has AircraftStand
may be collocated with Aerodrome
may provide information for multiple OperationalFlightInformationService
alternate Aerodrome
uses AltimeterSource
identified by AerodromeLocationIndicator
serves City
may be CoordinatedAirport


AerodromeControlService

Air traffic control service for aerodrome traffic.

Source: ICAO Annex 1; ICAO Annex 11; ICAO Annex 2;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:AirTrafficServices:AerodromeControlService

Associations:

Name Type
is provided for Heliport
is provided for Aerodrome


AerodromeControlTower

A unit established to provide air traffic control service to aerodrome traffic.

Source: ICAO Annex 1; ICAO Annex 11; ICAO Annex 2; ICAO Annex 3;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:Organisation:AerodromeControlTower

Associations:

Name Type
provides AerodromeControlService


AerodromeElevation

The elevation of the highest point of the landing area.

Source: ICAO Annex 1; ICAO Annex 14; ICAO Annex 3; ICAO Annex 4;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:AerodromeElevation


AerodromeHotSpot

A location on an aerodrome movement area with a history or potential risk of collision or runway incursion, and where heightened attention by pilots/drivers is necessary.

Source: ICAO; ICAO Annex 4;
Synonyms: Hot Spot, Airport Hot Spot
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:AerodromeHotSpot

Associations:

Name Type
on MovementArea
on Aerodrome


AerodromeLocationIndicator

A four-letter code group formulated in accordance with rules prescribed by ICAO and assigned to the aerodrome.

Source: ICAO Annex 10;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:CommunicationInfrastructure:AerodromeLocationIndicator


AerodromeMappingData

Data collected for the purpose of compiling aerodrome mapping information.

Source: ICAO Annex 15;
Abbreviations: AMD
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:InformationServicesProducts:AeronauticalInformationProduct:AerodromeMappingData


AerodromeMappingDatabase

A collection of aerodrome mapping data organized and arranged as a structured data set.

Source: ICAO Annex 15;
Abbreviations: AMDB
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:InformationServicesProducts:AeronauticalInformationProduct:AerodromeMappingDatabase


AerodromeMarker

An object displayed at an aerodrome above ground level in order to indicate an obstacle or delineate a boundary.

Source: ICAO Annex 1; ICAO Annex 14;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:AerodromeMarker


AerodromeMeteorologicalOffice

An office, located at an aerodrome, designated to provide meteorological service for international air navigation.

Source: ICAO; ICAO Annex 3;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:Organisation:AerodromeMeteorologicalOffice


AerodromeProtectionArea

An area situated in the vicinity of a runway, Final Approach and Take-Off Area (FATO) or Touchdown and Liftoff Area (TLOF), provided to protect aircraft during manoeuvring, take-off and/or landing operations.

Source: EUROCONTROL-FAA AIXM v.5.1;
Synonyms: AirportHeliportProtectionArea
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:AerodromeProtectionArea


AerodromeReferencePoint

The designated geographical location of an aerodrome.

Source: ICAO Annex 14;
Abbreviations: ARP
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:AerodromeReferencePoint


AerodromeSign

A sign presenting messages related to aircraft and vehicle movement.

Source: ICAO Annex 14, Vol. I, Fifth Edition;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:AerodromeSign

Associations:

Name Type
convey destination on MovementArea


AerodromeSurfaceRoutingNetwork

A connected and directed graph defined by Node and Edge features that represents logical and physical connections between taxiways, runways and other features related to the movement area of an aerodrome.

Source: EUROCAE ED 99D;
Abbreviations: ASRN
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:AerodromeSurfaceRoutingNetwork

Associations:

Name Type
defined by AerodromeSurfaceRoutingNetworkNode
defined by AerodromeSurfaceRoutingNetworkEdge
is for Aerodrome


AerodromeSurfaceRoutingNetworkEdge

A directional or bi-directional connection between nodes having an attached geometry which can be used for a graphical depiction of the taxi route.

Source: EUROCAE ED 99C;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:AerodromeSurfaceRoutingNetworkEdge


AerodromeSurfaceRoutingNetworkNode

Representation of the intersection of two or more aerodrome features related to taxi operations, or other special location such as holding position or entry or exit to a parking area.

Source: EUROCAE ED 99C;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:AerodromeSurfaceRoutingNetworkNode


AerodromeTrafficZone

An airspace of defined dimensions established around an aerodrome for the protection of aerodrome traffic.

Source: ICAO Annex 2;
Synonyms: AirportTrafficZone
Abbreviations: ATZ
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:Airspace:AerodromeTrafficZone

Associations:

Name Type
is established around Aerodrome


AerodromeWarning

Concise information of meteorological conditions which could adversely affect aircraft on the ground, including parked aircraft, and the aerodrome facilities and services.

Source: ICAO Annex 3;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:InformationServicesProducts:MeteorologicalInformationProduct:AerodromeWarning


AeronauticalChart

A representation of a portion of the Earth, its culture and relief, specifically designated to meet the requirements of air navigation.

Source: ICAO Annex 4;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:InformationServicesProducts:AeronauticalInformationProduct:AeronauticalChart


AeronauticalInformationCircular

A notice containing information that does not qualify for the origination of a NOTAM or for inclusion in the AIP, but which relates to flight safety, air navigation, technical, administrative or legislative matters.

Source: ICAO Annex 15;
Abbreviations: AIC
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:InformationServicesProducts:AeronauticalInformationProduct:AeronauticalInformationCircular


AeronauticalInformationPublication

A publication issued by or with the authority of a State and containing aeronautical information of a lasting character essential to air navigation.

Source: ICAO Annex 15;
Abbreviations: AIP
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:InformationServicesProducts:AeronauticalInformationProduct:AeronauticalInformationPublication


AeronauticalInformationService

A service established within the defined area of coverage responsible for the provision of aeronautical information/data necessary for the safety, regularity and efficiency of air navigation.

Source: ICAO Annex 15;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:AirTrafficServices:AeronauticalInformationService

Associations:

Name Type
publishes AeronauticalInformationPublication


AeronauticalMeteorologicalStation

A station designated to make observations and meteorological reports for use in international air navigation.

Source: ICAO Annex 3;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:Organisation:AeronauticalMeteorologicalStation


AeronauticalTelecommunicationNetwork

A global internetwork architecture that allows ground, air-ground and avionic data subnetworks to exchange digital data for the safety of air navigation and for the regular, efficient and economic operation of air traffic services.

Source: ICAO Annex 10, Vol. III, Second Edition;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:CommunicationInfrastructure:AeronauticalTelecommunicationNetwork


AeroplaneConfiguration

A particular combination of the positions of the moveable elements, such as wing flaps and landing gear, etc. that affect the aerodynamic characteristics of the aeroplane.

Source: ICAO Annex 8;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Aircraft:AeroplaneConfiguration

Associations:

Name Type
describes aeroplane configuration at TrajectoryPoint


AerospaceManufacturer

A company or individual involved in the various aspects of designing, building, testing, selling, and maintaining Aircraft, aircraft parts, missiles, rockets, and/or spacecraft.

Source: SESAR;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:Organisation:AerospaceManufacturer

Associations:

Name Type
is predefined by ManufacturerConfiguration


Agent

Someone who produces or is capable of producing an effect.

Source: Merriam-Webster Online Dictionary;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:OrganisationRoleAndService:Agent

Associations:

Name Type
is member of Organisation
holds Role
is based at Location
has ContactInformation


Agreed4DTrajectory

The current 4D trajectory that is agreed between the airspace user and the ASP after collaboration, or imposition of pre-collaborated rules.

Source: ICAO Doc 9965;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:Agreed4DTrajectory

Associations:

Name Type
represents a particular status of the trajectory during TrajectorySynchronisation


AIPAmendment

Permanent changes to the information contained in the AIP.

Source: ICAO Annex 15;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:InformationServicesProducts:AeronauticalInformationProduct:AIPAmendment


AIPSupplement

Temporary changes to the information contained in the AIP which are published by means of special pages.

Source: ICAO Annex 15;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:InformationServicesProducts:AeronauticalInformationProduct:AIPSupplement


AirborneHolding

A tactical ATFM measure requiring aircraft to hold at a waypoint in a predefined standard holding pattern.

Source: ICAO Doc 9971;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:DemandAndCapacityBalancing:AirborneHolding


AirborneSegment

The airborne segment of the trajectory describes the anticipated 4D path of the aircraft using data elements and resolution necessary to deliver a level of fidelity commensurate with requirements for each portion of the trajectory.

Source: ICAO Doc 9965;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:Movement:AirborneSegment


Aircraft

Any machine that can derive support in the atmosphere from the reactions of the air other than the reactions of the air against the earth's surface.

Source: ICAO Annex 1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Aircraft:Aircraft

Associations:

Name Type
has AircraftConfiguration
is manufactured by AerospaceManufacturer
has AircraftType
has category AircraftCategory
has AircraftModel
has AircraftMake
has AircraftSeries
is part of fleet of Operator
is equipped AircraftEquipment
has AircraftRegistration
has weight AircraftWeight
is operated by Operator


AircraftAddress

A unique combination of twenty-four bits available for assignment to an aircraft for the purpose of air-ground communications, navigation and surveillance.

Source: ICAO;
Synonyms: 24-bit aircraft address, 24-Bits Address
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Aircraft:AircraftAddress

Associations:

Name Type
assigned by State
is hardcoded in Aircraft


AircraftApproachCategory

Classification of aircraft based on 1.3 times stall speed in landing configuration at certified maximum landing mass.

Source: EUROCONTROL-FAA AIXM v.5.1;
Synonyms: Aircraft Landing Category
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Aircraft:AircraftApproachCategory


AircraftAvionics

Any electronic device - including its electrical part - for use in an aircraft, including radio, automatic flight control and instrument systems.

Source: ICAO Annex 1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Aircraft:AircraftAvionics


AircraftCapability

The ability of an aircraft or an aircraft equipment to provide a service or perform a function that, either on its own or with other services or functions, can deliver a definable level of performance. This level of performance is measurable within a framework of performance indicators and safety requirements.

Source: ICAO Doc 9854;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Aircraft:AircraftCapability

Associations:

Name Type
exempted by Organisation
depends on AircraftConfiguration


AircraftCategory

The aircraft categorization according to a set of criteria.

Source: SESAR;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Aircraft:AircraftCategory


AircraftConfiguration

An arrangement of one or more aircraft equipments in a particular form, figure, or combination.

Source: Oxford English Dictionary;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Aircraft:AircraftConfiguration

Associations:

Name Type
configures AircraftEquipment


AircraftEarthStation

A mobile earth station in the aeronautical mobile-satellite service located on board an aircraft.

Source: ICAO Annex 10, Vol. III, Second Edition;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:CommunicationInfrastructure:AircraftEarthStation


AircraftEquipment

Articles, including first-aid and survival equipment and commissary supplies, but not spare parts or stores, for use on board an aircraft during flight.

Source: ICAO Annex 9;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Aircraft:AircraftEquipment

Associations:

Name Type
is manufactured by AerospaceManufacturer


AircraftGroundService

The availability of maintenance, support and/or supply operations to aircraft at an aerodrome.

Source: DGIWG;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:AirTrafficServices:AircraftGroundService


AircraftIdentification

A group of letters, figures or a combination thereof which is either identical to, or the coded equivalent of, the aircraft call sign to be used in air-ground communications, and which is used to identify the aircraft in ground-ground air traffic services communications.

Source: ICAO Doc 4444, 15th Ed;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:FlightIdentifier:AircraftIdentification

Associations:

Name Type
may use ICAO code of Operator
may use AircraftRegistration


AircraftIntent

Information on planned future aircraft behaviour, which can be obtained from the aircraft systems (avionics). It is associated with the commanded trajectory and will enhance airborne functions. The aircraft intent data correspond either to aircraft trajectory data that directly relate to the future aircraft trajectory as programmed inside the avionics, or the aircraft control parameters as managed by the automatic flight control system. These aircraft control parameters could either be entered by the flight crew or automatically derived by the flight management system.

Source: ICAO Doc 9854;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:Movement:AircraftIntent

Associations:

Name Type
corresponds to FlightIntent
is representation of 4DTrajectory
is used during TrajectorySynchronisation


AircraftMake

The aircraft brand.

Source:
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Aircraft:AircraftMake

Associations:

Name Type
is owned by AerospaceManufacturer


AircraftModel

Each of a set of aircraft designs for a given aircraft make.

Source: Oxford English Dictionary;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Aircraft:AircraftModel


AircraftMovement

An aircraft take-off or landing at an airport. For aircraft traffic purposes one arrival and one departure is counted as two aircraft movements.

Source: ICAO;
Synonyms: GroundMovement
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:AircraftMovement

Associations:

Name Type
is performed during FlightPhase
is part of Flight
is sequenced after AircraftMovement
uses Taxiway
uses AircraftStand


AircraftObservation

The evaluation of one or more meteorological elements made from an aircraft in flight.

Source: ICAO; ICAO Annex 3;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:AircraftObservation


AircraftOperatingManual

A manual, acceptable to the State of the Operator, containing normal, abnormal and emergency procedures, checklists, limitations, performance information, details of the aircraft systems and other material relevant to the operation of the aircraft.

Source: ICAO Annex 6;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:DocumentAndAgreement:AircraftOperatingManual


AircraftRegistration

A unique, alphanumeric string that identifies a civil aircraft and consists of the Aircraft Nationality or Common Mark and an additional alphanumeric string assigned by the state of registry or common mark registering authority.

Source: FIXM v3.0;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Aircraft:AircraftRegistration

Associations:

Name Type
may consist of CommonMark
may consist of NationalityMark


AircraftSeries

A modifier, such as a numeral or sequential letter, denoting particular variations of a given aircraft model.

Source: Oxford English Dictionary;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Aircraft:AircraftSeries


AircraftStand

A designated area on an apron intended to be used for parking an aircraft.

Source: ICAO; ICAO Annex 1; ICAO Annex 14;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:AircraftStand

Associations:

Name Type
located on Apron
interdependant with AircraftStand


AircraftState

A vector describing the current state of an aircraft or a vehicle, e.g. position, speed, acceleration.

Source: EUROCONTROL ASTERIX;
Synonyms: StateVector, AircraftStateVector
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:AircraftState

Associations:

Name Type
describes state of aircraft at TrajectoryPoint
describes state of Aircraft


AircraftType

The type of an aircraft.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Aircraft:AircraftType

Associations:

Name Type
identified by AircraftTypeDesignator


AircraftTypeDesignator

A group of alphanumeric characters used to identify, in an abbreviated form, a type of aircraft.

Source: ICAO Doc 9426;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Aircraft:AircraftTypeDesignator


AircraftWeight

A characteristic weight value of an aircraft.

Source: SESAR;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Aircraft:AircraftWeight


AirDefenceIdentificationZone

Special designated airspace of defined dimensions within which aircraft are required to comply with special identification and/or reporting procedures additional to those related to the provision of air traffic services (ATS).

Source: EUROCONTROL-FAA AIXM v.5.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:Airspace:AirDefenceIdentificationZone


AIREP

A report from an aircraft in flight prepared in conformity with requirements for position, and operational and/or meteorological reporting.

Source: ICAO; ICAO Annex 3;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:InformationServicesProducts:MeteorologicalInformationProduct:AIREP


AirFiledFlightPlan

A flight plan provided to an air traffic services unit by an aircraft during its flight.

Source: ICAO Doc 9426;
Abbreviations: AFIL
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:InformationServicesProducts:FlightInformationProduct:AirFiledFlightPlan

Associations:

Name Type
is initial air filed instance of FlightPlan
is received by appropriate AirTrafficServicesUnit


Airline

As provided in Article 96 of the Convention, any air transport enterprise offering or operating a scheduled international air service.

Source: ICAO Annex 9;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:Organisation:Airline


AIRMET

Information issued by a meteorological watch office concerning the occurrence or expected occurrence of specified en-route weather phenomena which may affect the safety of low-level aircraft operations and which was not already included in the forecast issued for low-level flights in the flight information region concerned or sub-area thereof.

Source: ICAO; ICAO Annex 1; ICAO Annex 11; ICAO Annex 3;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:InformationServicesProducts:MeteorologicalInformationProduct:AIRMET


AirOperatorCertificate

A certificate authorizing an operator to carry out specified commercial air transport operations.

Source: ICAO Annex 6;
Abbreviations: AOC
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:DocumentAndAgreement:AirOperatorCertificate


AirportArrivalSlot

Permission given by a coordinator to use the full range of airport infrastructure necessary to operate an air service at a coordinated airport on a specific date and time for the purpose of landing.

Source: EUROCONTROL ATM Lexicon;
Abbreviations: ASLT
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:AerodromeOperations:AirportSlotManagement:AirportArrivalSlot

Associations:

Name Type
relates to InBlock
gives permission to use for landing Aerodrome
has allocated time AirportArrivalSlotTime


AirportArrivalSlotTime

The time for the Airport Arrival Slot as allocated by the Airport Slot Coordinator

Source: SESAR;
Abbreviations: AAST
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:AerodromeOperations:AirportSlotManagement:AirportArrivalSlotTime


AirportClearanceService

An airport ground service providing clearance capabilities for airport surfaces.

Source: EUROCONTROL-FAA AIXM v.5.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:AirTrafficServices:AirportClearanceService


AirportDepartureSlot

Permission given by a coordinator to use the full range of airport infrastructure necessary to operate an air service at a coordinated airport on a specific date and time for the purpose of take-off.

Source: EUROCONTROL ATM Lexicon;
Abbreviations: DSLT
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:AerodromeOperations:AirportSlotManagement:AirportDepartureSlot

Associations:

Name Type
relates to OffBlock
gives permission to use for take-off Aerodrome
has allocated time DepartureAirportSlotTime


AirportGroundService

Services that provide maintenance of the airport infrastructure and direct support to aircraft on the ground.

Source: EUROCONTROL-FAA AIXM v.5.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:AirTrafficServices:AirportGroundService


AirportSlot

The scheduled time of arrival or departure available for allocation by, or as allocated by, a coordinator for an aircraft movement on a specific date at a coordinated airport. For scheduling purposes, the slot is the scheduled time of arrival or departure at the terminal, not the time of landing or take-off from the runway. An allocated slot will take account of all the coordination parameters at the airport e.g. runway(s), taxiways, aircraft parking stands, gates, terminal capacity (e.g. check-in and baggage delivery), environmental constraints e.g. night restrictions etc.

Source: IATA Worldwide Scheduling Guidelines, 21st Edition;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:AerodromeOperations:AirportSlotManagement:AirportSlot

Associations:

Name Type
constrains DepartureSurfaceSegment
constrains ArrivalSurfaceSegment
is allocated to allow AircraftMovement


AirportSuppliesService

A service that provides supplies (fuel, oil, oxygen, etc.) to aircraft.

Source: EUROCONTROL-FAA AIXM v.5.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:AirTrafficServices:AirportSuppliesService


AirportSurveillanceRadar

A category of surveillance radars. ASR is designed to provide relatively short-range coverage in the general vicinity of an airport and to serve as an expeditious means of handling terminal area traffic through observation of precise aircraft locations on a radarscope. The ASR can also be used as an instrument approach aid.

Source: FAA (Federal Aviation Administration);
Abbreviations: ASR
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:AirportSurveillanceRadar


AirService

iI its broadest sense, includes any service performed by aircraft for public transportation, whether on a scheduled or non-scheduled basis.

For regulatory purposes, however, the term always has a specific meaning (defined in Article 96(a) of the Convention on International Civil Aviation and used in most bilateral air transport agreements between States) and refers to any scheduled air service performed by aircraft for the public transport of passengers, mail or cargo.

Source: ICAO Doc 9626;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:AirService


Airspace

A defined three dimensional region of space relevant to air traffic.

Source: EUROCONTROL-FAA AIXM v.5.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:Airspace:Airspace

Associations:

Name Type
protects ATSRoute
identified by AirspaceLocationIndicator
may be classified and designated in accordance with AirspaceClassification
protects AerialRefuelling
is under responsibility of FormalOrganisation
has volume Geometry


AirspaceClassA

Airspace Classification whereby IFR flights only are permitted, all flights are provided with air traffic control service and are separated from each other.

Source: ICAO Annex 11;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:Airspace:AirspaceClassA


AirspaceClassB

Airspace Classification whereby IFR and VFR flights are permitted, all flights are provided with air traffic control service and are separated from each other.

Source: ICAO Annex 11;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:Airspace:AirspaceClassB


AirspaceClassC

Airspace Classification whereby IFR and VFR flights are permitted, all flights are provided with air traffic control service and IFR flights are separated from other IFR flights and from VFR flights. VFR flights are separated from IFR flights and receive traffic information in respect of other VFR flights.

Source: ICAO Annex 11;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:Airspace:AirspaceClassC


AirspaceClassD

Airspace Classification whereby IFR and VFR flights are permitted and all flights are provided with air traffic control service, IFR flights are separated from other IFR flights and receive traffic information in respect of VFR flights, VFR flights receive traffic information in respect of all other flights.

Source: ICAO Annex 11;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:Airspace:AirspaceClassD


AirspaceClassE

Airspace Classification whereby IFR and VFR flights are permitted, IFR flights are provided with air traffic control service and are separated from other IFR flights. All flights receive traffic information as far as is practical. Class E shall not be used for control zones.

Source: ICAO Annex 11;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:Airspace:AirspaceClassE


AirspaceClassF

Airspace Classification whereby IFR and VFR flights are permitted, all participating IFR flights receive an air traffic advisory service and all flights receive flight information service if requested.

Source: ICAO Annex 11;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:Airspace:AirspaceClassF


AirspaceClassG

Airspace Classification whereby IFR and VFR flights are permitted and receive flight information service if requested.

Source: ICAO Annex 11;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:Airspace:AirspaceClassG


AirspaceClassification

A classification of airspace which determines the operating rules, flight requirements, and services provided.

Source: EUROCONTROL-FAA AIXM v.5.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:Airspace:AirspaceClassification


AirspaceEntry

The event of entering an airspace.

Source: SESAR;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:FlightEvent:AirspaceEntry

Associations:

Name Type
into Airspace


AirspaceExit

The event of exiting an airspace.

Source: SESAR;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:FlightEvent:AirspaceExit

Associations:

Name Type
from Airspace


AirspaceLocationIndicator

A four-letter code group formulated in accordance with rules prescribed by ICAO and assigned to the airspace.

Source: ICAO Annex 10;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:CommunicationInfrastructure:AirspaceLocationIndicator


AirspaceRestriction

A defined volume of airspace within which, variously, activities dangerous to the flight of aircraft may be conducted at specified times (a 'danger area'); or such airspace situated above the land areas or territorial waters of a State, within which the flight of aircraft is restricted in accordance with certain specified conditions (a 'restricted area'); or airspace situated above the land areas or territorial waters of a State, within which the flight of aircraft is prohibited (a 'prohibited area').

Source: SESAR;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:Airspace:AirspaceRestriction

Associations:

Name Type
may be ProhibitedArea
may be RestrictedArea
may be DangerArea


AirspaceStatus

The activation status of the airspace.

Source: EUROCONTROL-FAA AIXM v.5.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:AirspaceOrganizationAndManagement:AirspaceStatus


AirspaceUser

A generic term designating an organization operating aircraft and its pilots, the flight operations centres (FOC) responsible for the strategic planning of a flight and the entity responsible for the execution of a flight which is traditionally a flight deck.

Source: ICAO Doc 9965;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:Organisation:AirspaceUser

Associations:

Name Type
requests AirportSlot


AirTaxiService

A type of on-demand air service usually performed by small capacity aircraft on short notice in a very similar way to an automobile taxi service; or in some cases, a service operated on a scheduled basis with stops made only at points where passengers and cargo are to be picked up or discharged.

Source: ICAO Doc 9626;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:AirTaxiService


AirTraffic

All aircraft in flight or operating on the manoeuvring area of an aerodrome.

Source: ICAO Annex 2;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:DemandAndCapacityBalancing:AirTraffic


AirTrafficAdvisoryService

A service provided within advisory airspace to ensure separation, in so far as practical, between aircraft which are operating on IFR flight plans.

Source: ICAO Annex 1; ICAO Annex 11; ICAO Annex 2;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:AirTrafficServices:AirTrafficAdvisoryService

Associations:

Name Type
serves IFR flights in AdvisoryAirspace


AirTrafficControlService

A service provided for the purpose of: a) preventing collisions: 1. between aircraft, and 2. on the manoeuvring area between aircraft and obstructions; and b) expediting and maintaining an orderly flow of air traffic.

Source: ICAO; ICAO Annex 1; ICAO Annex 11; ICAO Annex 2;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:AirTrafficServices:AirTrafficControlService

Associations:

Name Type
is provided for TerminalProcedure
is provided for RoutePortion
is provided for HoldingProcedure
is provided for ControlledAirspace


AirTrafficControlUnit

A generic term meaning variously, area control centre, approach control unit or aerodrome control tower.

Source: ICAO Annex 1; ICAO Annex 11; ICAO Annex 2;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:Organisation:AirTrafficControlUnit

Associations:

Name Type
has role TransferringUnitOrController
implements Separator
has role AcceptingUnitOrController
enters RegionalAirNavigationAgreement
provides FlightInformationService
provides AlertingService
provides AirTrafficControlService


AirTrafficFlowManagement

A service established with the objective of contributing to a safe, orderly and expeditious flow of air traffic by ensuring that ATC capacity is utilized to the maximum extent possible and that the traffic volume is compatible with the capacities declared by the appropriate ATS authority.

Source: ICAO Annex 1; ICAO Annex 11;
Abbreviations: ATFM
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:AirTrafficServices:AirTrafficFlowManagement

Associations:

Name Type
is carried out in ATFMPhase


AirTrafficManagementSystem

A system that provides ATM through the collaborative integration of humans, information, technology, facilities and services, supported by air and ground- and/or space-based communications, navigation and surveillance.

Source: ICAO Doc 9854;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:Organisation:AirTrafficManagementSystem


AirTrafficService

A generic term meaning variously, flight information service, alerting service, air traffic advisory service, air traffic control service (area control service, approach control service or aerodrome control service).

Source: ICAO Annex 1; ICAO Annex 10; ICAO Annex 11; ICAO Annex 2; ICAO Annex 4;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:AirTrafficServices:AirTrafficService

Associations:

Name Type
covers Airspace


AirTrafficServicesAirspaces

Airspaces of defined dimensions, alphabetically designated, within which specific types of flights may operate and for which air traffic services and rules of operation are specified.

Source: ICAO Annex 1; ICAO Annex 11; ICAO Annex 2;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:Airspace:AirTrafficServicesAirspaces


AirTrafficServicesReportingOffice

A unit established for the purpose of receiving reports concerning air traffic services and flight plans submitted before departure.

Source: ICAO Annex 1; ICAO Annex 11; ICAO Annex 2;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:Organisation:AirTrafficServicesReportingOffice


AirTrafficServicesUnit

A generic term meaning variously, air traffic control unit, flight information centre or air traffic services reporting office.

Source: ICAO Annex 1; ICAO Annex 11; ICAO Annex 2; ICAO Annex 3;
Abbreviations: ATSU
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:Organisation:AirTrafficServicesUnit

Associations:

Name Type
coordinates with MeteorologicalWatchOffice
notifies of alert or uncertainty phase Operator
reached by ServiceProviderCallsign
provides AirTrafficService
provides AirTrafficAdvisoryService
identified by ATSUnitLocationIndicator
issues AlertMessage
receives AlertMessage
considers flight to be in EmergencyPhase


Airway

A control area or portion thereof established in the form of a corridor.

Source: ICAO Annex 1; ICAO Annex 11; ICAO Annex 2; ICAO Annex 4;
Abbreviations: AWY
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:Airspace:Airway

Associations:

Name Type
forms corridor around ATSRoute


AlertArea

An airspace which may contain a high volume of pilot training activities or unusual type of aerial activity, neither of which is hazardous to aircraft.

Source: EUROCONTROL-FAA AIXM v.5.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:Airspace:AlertArea


AlertingService

A service provided to notify appropriate organizations regarding aircraft in need of search and rescue aid, and assist such organizations as required.

Source: ICAO Annex 1; ICAO Annex 11; ICAO Annex 2;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:AirTrafficServices:AlertingService

Associations:

Name Type
is provided within FlightInformationRegion


AlertMessage

Message transmitted when an ATS Unit considers that an aircraft is in a state of emergency. Message is transmitted to all ATS Units that may be concerned with the flight and to the associated coordination centres.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:InformationServicesProducts:FlightInformationProduct:AlertMessage


AlertPhase

A situation wherein apprehension exists as to the safety of an aircraft and its occupants.

Source: ICAO Annex 12;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:EmergencyOperations:AlertPhase


AlongRouteDistance

The distance along the route. For an ASP-provided expanded route, it is computed from the first converted fix in the ASP's airspace for each route point in the expanded route. For an operator-provided expanded route, it is computed from the beginning of the route.

Source: ICAO;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:Movement:AlongRouteDistance

Associations:

Name Type
is distance along FlightRoute
from TrajectoryPoint


AltimeterSettingRegion

An airspace of defined dimensions within which standardized altimeter setting procedures apply.

Source: EUROCONTROL-FAA AIXM v.5.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:Airspace:AltimeterSettingRegion


AltimeterSource

An instrument which measures vertical distance with respect to a reference level.

Source: NATO AAP-6 (2004);
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:AltimeterSource


Altitude

The vertical distance of a level, a point or an object considered as a point, measured from mean sea level (MSL).

Source: ICAO Annex 1; ICAO Annex 10; ICAO Annex 11; ICAO Annex 2; ICAO Annex 3; ICAO Annex 4;
Abbreviations: ALT
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Common:Geometry:Altitude

Associations:

Name Type
can be expressed in FlightLevel
is measured from MeanSeaLevel


Altocumulus

White or grey, or both white and grey, patch, sheet or layer of cloud, generally with shading, composed of laminae, rounded masses, rolls, etc., which are sometimes partly fibrous or diffuse and which may or may not be merged; most of the regularly arranged small elements usually have an apparent width of between one and five degrees.

Source: WMO International Meteorological Vocabulary;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:Altocumulus


Altostratus

Greyish or bluish cloud sheet or layer of striated, fibrous or uniform appearance, totally or partly covering the sky, and having parts thin enough to reveal the Sun at least vaguely, as through ground glass. Altostratus does not show halo phenomena.

Source: WMO International Meteorological Vocabulary;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:Altostratus


Ampere

The ampere is that constant electric current which, if maintained in two straight parallel conductors of infinite length, of negligible circular cross-section, and placed 1 metre apart in a vacuum, would produce between these conductors a force equal to 2 x 10-7 newton per metre of length.

Source: ICAO Annex 5;
Abbreviations: A
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Common:UnitsOfMeasure:Ampere


AnchorageArea

An area designated specifically for the parking of seaplanes.

Source: FAA (Federal Aviation Administration);
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:AnchorageArea

Associations:

Name Type
marked by MarkingBuoy


ApproachControlService

Air traffic control service for arriving or departing controlled flights.

Source: ICAO Annex 1; ICAO Annex 11; ICAO Annex 2;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:AirTrafficServices:ApproachControlService

Associations:

Name Type
consumes Operator


ApproachControlUnit

A unit established to provide air traffic control service to controlled flights arriving at, or departing from, one or more aerodromes.

Source: ICAO Annex 1; ICAO Annex 11; ICAO Annex 2; ICAO Annex 3;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:Organisation:ApproachControlUnit

Associations:

Name Type
provides ApproachControlService


ApproachHolding

The phase of flight in which a pre-determined ad-hoc manoeuvre during the approach keeps the aircraft within a specified airspace awaiting further instructions.

Source: ICAO ADREP 2000;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:FlightPhase:ApproachHolding

Associations:

Name Type
may be based on HoldingProcedure


ApproachLightingSystem

An airport lighting facility which provides visual guidance to landing aircraft by radiating light beams in a directional pattern by which the pilot aligns the aircraft with the final approach path for landing.

Source: EUROCONTROL-FAA AIXM v.5.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:ApproachLightingSystem


ApproachPhase

The phase of flight from the outer marker to the to the point of transition from nose-low to nose-high attitude immediately prior to the flare above the runway [ifr]; or [vfr] from 1500 feet (450 metres) above the runway end elevation or from the point of vfr pattern entry to the flare above the runway.

Source: ICAO ADREP 2000;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:FlightPhase:ApproachPhase

Associations:

Name Type
includes ApproachHolding


ApproachProcedureWithVerticalGuidance

An instrument approach procedure which utilizes lateral and vertical guidance but does not meet the requirements established for precision approach and landing operations.

Source: ICAO;
Abbreviations: APV
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:RouteAndProcedure:ApproachProcedureWithVerticalGuidance

Associations:

Name Type
has DecisionAltitude
has DecisionHeight


ApproachSequence

The order in which two or more aircraft are cleared to approach to land at the aerodrome.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:TrafficSynchronization:ArrivalManagement:ApproachSequence


AppropriateATSAuthority

The relevant authority designated by the State responsible for providing air traffic services in the airspace concerned.

Source: ICAO Annex 1; ICAO Annex 11; ICAO Annex 2; ICAO Annex 3;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:Organisation:AppropriateATSAuthority

Associations:

Name Type
coordinates with MeteorologicalAuthority
may in the context of a given flight be AppropriateAuthority
implements AirTrafficServicesUnit
is responsible for providing AirTrafficService
communicates DeclaredCapacity


AppropriateAuthority

a) Regarding flight over the high seas: The relevant authority of the State of Registry. b) Regarding flight other than over the high seas: The relevant authority of the State having sovereignty over the territory being overflown.

Source: ICAO Annex 2;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:Organisation:AppropriateAuthority


Apron

A defined area, on a land aerodrome/heliport, intended to accommodate aircraft/helicopters for purposes of loading and unloading passengers, mail or cargo, and for fuelling, parking or maintenance.

Source: ICAO Annex 1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:Apron

Associations:

Name Type
part of MovementArea
on Heliport
has Geometry
on Aerodrome


ApronManagementService

A service provided to regulate the activities and the movement of aircraft and vehicles on an apron.

Source: ICAO Annex 1; ICAO Annex 11; ICAO Annex 14;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:AirTrafficServices:ApronManagementService


AreaControlCentre

A unit established to provide air traffic control service to controlled flights in control areas under its jurisdiction.

Source: ICAO Annex 1; ICAO Annex 11; ICAO Annex 2; ICAO Annex 3;
Abbreviations: ACC
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:Organisation:AreaControlCentre

Associations:

Name Type
provides AreaControlService


AreaControlService

Air traffic control service for controlled flights in control areas.

Source: ICAO Annex 1; ICAO Annex 11; ICAO Annex 2;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:AirTrafficServices:AreaControlService


AreaNavigationRoute

An ATS route established for the use of aircraft capable of employing area navigation.

Source: ICAO Annex 1; ICAO Annex 11;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:RouteAndProcedure:AreaNavigationRoute

Associations:

Name Type
requires specific AircraftCapability


AreaOfCommonInterest

A route or portion of a route that is in close proximity to flight information boundaries. The extent is usually determined by the required separation minima.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:TrafficSynchronization:Coordination:AreaOfCommonInterest

Associations:

Name Type
must as a minimum cover SeparationMinima
covers part of FlightInformationRegion


AreaReport

A meteorological report that includes information related to a region rather than a single point.

Source: ICAO Annex 3;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:InformationServicesProducts:MeteorologicalInformationProduct:AreaReport


ArrestingGear

A series of devices (for example: engaging or catching devices and energy absorption devices) that are used to stop an aircraft by absorbing its momentum in a routine landing, emergency landing or aborted take-off.

Source: DGIWG;
Synonyms: Arresting System
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:ArrestingGear

Associations:

Name Type
situated at RunwayDirection


ArrivalMessage

A message transmitted by the appropriate ATS unit on receiving an arrival report.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:InformationServicesProducts:FlightInformationProduct:ArrivalMessage


ArrivalOperations

The set of flight operations following procedures associated with the destination aerodrome.

Source: SESAR;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:AerodromeOperations:ArrivalOperations

Associations:

Name Type
follows procedures associated with Aerodrome
at Gate
is set of operations related to Flight
comprises ApproachPhase
ends with InBlock
comprises LandingPhase
may use StandardInstrumentArrival


ArrivalSurfaceSegment

This segment describes the elements of the trajectory from the arrival runway, if applicable, to the arrival gate/stand. This segment reuses the same information items as for the departure surface segment, but in reverse.

Source: ICAO Doc 9965;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:Movement:ArrivalSurfaceSegment

Associations:

Name Type
uses Taxiway
uses Runway
uses AircraftStand
is relevant for ArrivalOperations


ASHTAM

A special series NOTAM notifying by means of a specific format change in activity of a volcano, a volcanic eruption and/or volcanic ash cloud that is of significance to aircraft operations.

Source: ICAO Annex 15;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:InformationServicesProducts:AeronauticalInformationProduct:ASHTAM


AssumedAltimeterSetting

The altimeter setting that was used during prediction at this trajectory point for the computation of barometric altitude is provided.

Source: [AIRM]
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Aircraft:AssumedAltimeterSetting

Associations:

Name Type
at TrajectoryPoint


ATCBlindSpot

A location on an aerodrome movement area that is not visible to ATC personnel due to obstructions and is not designated as a Hot Spot.

Source: EUROCAE ED 99D;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:ATCBlindSpot

Associations:

Name Type
on MovementArea
on Aerodrome


ATCClearance

Authorization for an aircraft to proceed under conditions specified by an air traffic control unit.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:ATCClearance

Associations:

Name Type
authorises taking constraints into account 4DTrajectory
takes into account ATMTrajectoryConstraint


ATCInstruction

Directives issued by air traffic control for the purpose of requiring a pilot to take a specific action.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:ATCInstruction

Associations:

Name Type
implements ATMTrajectoryConstraint


ATFMPhase

A phase in which ATFM is carried out.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:DemandAndCapacityBalancing:ATFMPhase


ATISMessage

May contain: - meteorological information to be extracted from the local routine report (MET Report) or the local special report (SPECIAL) - aeronautical info from the NOTAM

Source: ICAO; ICAO Annex 1; ICAO Annex 11;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:InformationServicesProducts:ATISMessage

Associations:

Name Type
is a subset of METREPORT


AtLevelProceedDirectToPosition

Instruction to proceed, upon reaching the specified level, directly to the specified position.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:AtLevelProceedDirectToPosition


ATMCommunity

The aggregate of organizations, agencies or entities that may participate, collaborate and cooperate in the planning, development, use, regulation, operation and maintenance of the ATM system.

Source: ICAO Doc 9854;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:Organisation:ATMCommunity

Associations:

Name Type
includes AirTrafficServicesUnit
includes PublicAuthority
provides AirTrafficManagementSystem
includes Operator
includes MeteorologicalAuthority
includes AerospaceManufacturer


ATMPlanning

The ATFM phase during which the following measures are taken: a) reviewing airspace design (route structure and ATS sectors) and airspace utilization policies to look for potential capacity improvements; b) reviewing the technical infrastructure to assess the possibility of improving capacity. This is typically accomplished by upgrading various ATM support tools or enabling navigation, communications or surveillance infrastructure; c) reviewing and updating ATM procedures induced by changes to airspace design and technical infrastructure; d) reviewing staffing practices to evaluate the potential for matching staffing resources with workload and the eventual need for adjustments in staffing levels; and e) reviewing the training that has been developed and delivered to ATFM stakeholders.

Source: ICAO Doc 9971;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:DemandAndCapacityBalancing:ATMPlanning


ATMTrajectoryConstraint

Trajectory constraint imposed by the ATM system.

Source: ICAO Doc 9965;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:Movement:ATMTrajectoryConstraint

Associations:

Name Type
restricts planning and execution of 4DTrajectory
complies with FlightRestriction


AtNode

The event of arriving at an aerodrome surface routing network node.

Source: SESAR;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:FlightEvent:AtNode

Associations:

Name Type
at AerodromeSurfaceRoutingNetworkNode


AtPositionClearedProcedure

Instruction to proceed from the specified position via the specified procedure.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:AtPositionClearedProcedure


AtPositionClearedRoute

Instruction to proceed from the specified position via the specified route.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:AtPositionClearedRoute


AtPositionClimbToLevel

Instruction that at the specified time or position (exclusive) a climb to the specified level is to commence and once reached the specified level is to be maintained.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:AtPositionClimbToLevel


AtPositionDescendToLevel

Instruction that at the specified position a descent to the specified level is to commence and once reached the specified level is to be maintained.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:AtPositionDescendToLevel


AtPositionProceedDirectToPosition

Instruction to proceed, at the specified position, directly to the next specified position.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:AtPositionProceedDirectToPosition


ATSRoute

A specified route designed for channelling the flow of traffic as necessary for the provision of air traffic services.

Source: ICAO Annex 1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:RouteAndProcedure:ATSRoute

Associations:

Name Type
connects to StandardInstrumentArrival
may designate TerminalProcedure
has RouteLayout


ATSSurveillanceService

A term used to indicate a service provided directly by means of an ATS surveillance system.

Source: ICAO Annex 1; ICAO Annex 15;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:AirTrafficServices:ATSSurveillanceService


ATSSurveillanceSystem

A generic term meaning variously, ADS-B, PSR, SSR or any comparable ground-based system that enables the identification of aircraft.

Source: ICAO Annex 1; ICAO Annex 15;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:SurveillanceInfrastructure:ATSSurveillanceSystem


ATSUnitLocationIndicator

A four-letter code group formulated in accordance with rules prescribed by ICAO and assigned to the ATS unit.

Source: ICAO Annex 10;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:CommunicationInfrastructure:ATSUnitLocationIndicator


AtTimeClimbToLevel

Instruction that at the specified time a climb to the specified level is to commence and once reached the specified level is to be maintained.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:AtTimeClimbToLevel


AtTimeCrossPositionAtAndMaintainLevel

Instruction that at the specified time the specified position is to be crossed at the specified level and the level is to be maintained.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:AtTimeCrossPositionAtAndMaintainLevel


AtTimeCrossPositionAtAndMaintainLevelAtSpeed

Instruction that at the specified time the specified position is to be crossed at the specified level and speed, and the level and speed are to be maintained.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:AtTimeCrossPositionAtAndMaintainLevelAtSpeed


AtTimeDescendToLevel

Instruction that at a specified time a descent to a specified level is to commence and once reached the specified level is to be maintained.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:AtTimeDescendToLevel


AtTimeProceedDirectToPosition

Instruction to proceed, at the specified time, directly to the specified position.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:AtTimeProceedDirectToPosition


AuroralActivity

Natural light display in the sky particularly in the high latitude regions, caused by the collision of energetic charged particles with atoms in the high altitude atmosphere (thermosphere).

Source: FAA (Federal Aviation Administration);
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:AuroralActivity


AuthorizedAgent

A person who represents an aircraft operator and who is authorized by or on behalf of such operator to act on formalities connected with the entry and clearance of the operator's aircraft, crew, passengers, cargo, mail, baggage or stores and includes, where national law permits, a third party authorized to handle cargo on the aircraft.

Source: ICAO Annex 9;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:Agent:AuthorizedAgent


AutomatedWeatherObservationSystem

Automated sensor suites which are designed to serve aviation and meteorological observing needs for safe and efficient aviation operations and weather forecasting.

Source: FAA (Federal Aviation Administration);
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:AutomatedWeatherObservationSystem


AutomaticDependentSurveillance

A function for use by air traffic services (ATS) in which aircraft automatically transmit, via a data link, data derived from on-board navigation systems. As a minimum, the data include aircraft identification and three-dimensional position. Additional data may be provided as appropriate.

Source: ICAO Annex 3;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:SurveillanceInfrastructure:AutomaticDependentSurveillance


AutomaticDependentSurveillanceBroadcast

A means by which aircraft, aerodrome vehicles and other objects can automatically transmit and/or receive data such as identification, position and additional data, as appropriate, in a broadcast mode via a data link.

Source: ICAO Annex 10, Vol. III, Second Edition;
Abbreviations: ADS-B
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:SurveillanceInfrastructure:AutomaticDependentSurveillanceBroadcast


AutomaticDependentSurveillanceContract

A means by which the terms of an ADS-C agreement will be exchanged between the ground system and the aircraft, via a data link, specifying under what conditions ADS-C reports would be initiated, and what data would be contained in the reports.

Source: ICAO; ICAO Annex 2;
Abbreviations: ADS-C
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:SurveillanceInfrastructure:AutomaticDependentSurveillanceContract


AutomaticDeployableELT

An ELT which is rigidly attached to an aircraft and which is automatically deployed and activated by impact, and, in some cases, also by hydrostatic sensors. Manual deployment is also provided.

Source: ICAO Doc 9713;
Abbreviations: ELT(AD)
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Aircraft:AutomaticDeployableELT


AutomaticFixedELT

An automatically activated ELT which is permanently attached to an aircraft.

Source: ICAO Doc 9713;
Abbreviations: ELT(AF)
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Aircraft:AutomaticFixedELT


AutomaticPortableELT

An automatically activated ELT which is rigidly attached to an aircraft but readily removable from the aircraft.

Source: ICAO Doc 9713;
Abbreviations: ELT(AP)
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Aircraft:AutomaticPortableELT


AutomaticTerminalInformationService

The automatic provision of current, routine information to arriving and departing aircraft throughout 24 hours or a specified portion thereof.

Source: ICAO Annex 1;
Abbreviations: ATIS
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:AirTrafficServices:AutomaticTerminalInformationService

Associations:

Name Type
provides information for Aerodrome
distributes ATISMessage


AuxiliaryPowerUnit

A self-contained power-unit on an aircraft providing electrical/pneumatic power to aircraft systems during ground operations.

Source: ICAO Annex 1;
Abbreviations: APU
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Aircraft:AuxiliaryPowerUnit


Becquerel

The activity of a radionuclide having one spontaneous nuclear transition per second.

Source: ICAO Annex 5;
Abbreviations: Bq
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Common:UnitsOfMeasure:Becquerel


BeginStay

The beginning of an operation at which the flight will remain for some time.

Source: ICAO;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:FlightEvent:BeginStay

Associations:

Name Type
marks the start of StayPhase


Bridge

A structure forming or carrying a road over a river, a ravine, etc., or affording passage between two points at a height above the ground.

Source: Oxford English Dictionary;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:Bridge

Associations:

Name Type
has BridgeSide


BridgeSide

Line representing the side extent of aerodrome feature(s) associated with the vertical drop section of an overpass.

Source: EUROCAE ED 99D;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:BridgeSide


BriefingService

Pre-flight and post-flight briefing service.

Source: EUROCONTROL-FAA AIXM v.5.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:AirTrafficServices:BriefingService

Associations:

Name Type
publishes PreFlightInformationBulletin


BusinessService

The provision of tangible goods, information, instructions or guidance.

Source: EUROCONTROL-FAA AIXM v.5.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:OrganisationRoleAndService:BusinessService

Associations:

Name Type
communicates on RadioCommunicationChannel


CabinCrewMember

A crew member who performs, in the interest of safety of passengers, duties assigned by the operator or the pilot-in-command of the aircraft, but who shall not act as a flight crew member.

Source: ICAO Annex 6;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:Agent:CabinCrewMember


Calendar

Discrete temporal reference system that provides the basis for defining temporal position to a resolution of one day (ISO 19108).

Source: ICAO Annex 1; ICAO Annex 11; ICAO Annex 14; ICAO Annex 15; ICAO Annex 4;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Common:Temporal:Calendar


CalibratedAirspeed

Indicated airspeed corrected for instrument errors and position error (due to incorrect pressure at the static port caused by airflow disruption).

Source: SESAR;
Abbreviations: CAS
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:CalibratedAirspeed


CancellationMessage

A message transmitted when a flight, for which basic flight plan data (FPL) has been previously distributed, has been cancelled.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:InformationServicesProducts:FlightInformationProduct:CancellationMessage


Candela

The luminous intensity, in the perpendicular direction, of a surface of 1/600 000 square metre of black body at the temperature of freezing platinum under a pressure of 101 325 newtons per square metre.

Source: ICAO Annex 5;
Abbreviations: cd
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Common:UnitsOfMeasure:Candela


Capacity

The maximum number of aircraft that can be accommodated in a given time period by the system or one of its components (throughput).

Source: ICAO Doc 9854;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:DemandAndCapacityBalancing:Capacity

Associations:

Name Type
defined for Heliport
is defined for Airspace


Cargo

Any property carried on an aircraft other than mail, stores and accompanied or mishandled baggage.

Source: ICAO Annex 1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Aircraft:Cargo


CargoAirService

An air service provided for the public transport of freight and mail.

Source: ICAO Doc 9626;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:CargoAirService


CDNMessage

A message transmitted during the coordination dialogue by an accepting unit to the transferring unit when the former wishes to propose a change to coordination data as contained in a previous current flight plan or estimate message.

If the transferring unit wishes to propose a change to the data contained in a Coordination message, a coordination message shall be transmitted to the accepting unit.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:InformationServicesProducts:FlightInformationProduct:CDNMessage

Associations:

Name Type
proposes changes of conditions in CoordinationAndTransfer
may refer to TransferOfControlPoint
may refer to ControlAreaBoundaryPoint


Ceiling

Height above the Earth's surface of the base of the lower cloud layer whose amount exceeds a specific value.

Source: WMO International Meteorological Vocabulary;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:Ceiling


ChangeMessage

A message transmitted when any change is to be made to the basic flight plan data (FPL). It is sent to all recipients of basic flight plan data affected by the change.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:InformationServicesProducts:FlightInformationProduct:ChangeMessage


ChangeOfCruiseLevelPhase

The phase of flight during which the aircraft climbs, or descends, from one cruising flight level or altitude to the next cruising flight level or altitude.

Source: ICAO ADREP 2000;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:FlightPhase:ChangeOfCruiseLevelPhase


ChangeOverPoint

The point at which an aircraft navigating on an ATS route segment defined by reference to very high frequency omnidirectional radio ranges is expected to transfer its primary navigational reference from the facility behind the aircraft to the next facility ahead of the aircraft.

Source: ICAO Annex 1; ICAO Annex 11; ICAO Annex 2; ICAO Annex 4;
Abbreviations: COP
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:InfrastructurePoint:ChangeOverPoint


CirclingApproach

An extension of an instrument approach procedure which provides for visual circling of the aerodrome prior to landing.

Source: ICAO Doc 8168, Vol. I, 5th Ed;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:RouteAndProcedure:CirclingApproach

Associations:

Name Type
extends for visual circling InstrumentApproachProcedure


Cirrocumulus

Thin, white patch, sheet or layer of cloud without shading, composed of very small elements in the form of grains, ripples, etc., merged or separated, and more or less regularly arranged; most of the elements have an apparent width of less than one degree.

Source: WMO International Meteorological Vocabulary;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:Cirrocumulus


Cirrostratus

Transparent, whitish cloud veil of fibrous (hair-like) or smooth appearance, totally or partially covering the sky, and generally producing halo phenomena.

Source: WMO International Meteorological Vocabulary;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:Cirrostratus


Cirrus

Detached clouds in the form of white, delicate filaments or white or mostly white patches or narrow bands. These clouds have a fibrous (hair-like) appearance, or a silky sheen, or both.

Source: WMO International Meteorological Vocabulary;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:Cirrus


City

A town or other inhabited place.

Source: Oxford English Dictionary;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Common:Geospatial:City


ClearAirTurbulence

Upper-atmospheric turbulence encountered by an aircraft when flying through clear air.

Source: WMO International Meteorological Vocabulary;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:ClearAirTurbulence


ClearedRoute

Instruction to proceed via the specified route.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:ClearedRoute


Clearway

A defined rectangular area on the ground or water under the control of the appropriate authority, selected or prepared as a suitable area over which an aeroplane may make a portion of its initial climb to a specified height.

Source: ICAO Annex 14, Vol. I, Fifth Edition;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:Clearway

Associations:

Name Type
adjoins Runway


ClimbAtVerticalRateMaximum

Instruction to climb at not above the specified rate.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:ClimbAtVerticalRateMaximum


ClimbAtVerticalRateMinimum

Instruction to climb at not less than the specified rate.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:ClimbAtVerticalRateMinimum


ClimbToCruisingLevelOrAltitude

The phase of flight in which the climb from the completion of the initial climb to cruising level or altitude occurs.

Source: ICAO ADREP 2000;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:FlightPhase:ClimbToCruisingLevelOrAltitude


ClimbToLevel

Instruction that a climb to a specified level is to commence and once reached the specified level is to be maintained.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:ClimbToLevel


ClimbToReachLevelByPosition

Instruction that a climb is to commence at a rate such that the specified level is reached at or before the specified position. When this message element is not concatenated with another vertical clearance, the level specified is the assigned level which is to be maintained.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:ClimbToReachLevelByPosition


ClimbToReachLevelByTime

Instruction that a climb is to commence at a rate such that the specified level is reached at or before the specified time. When this message element is not concatenated with another vertical clearance, the level specified is the assigned level which is to be maintained.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:ClimbToReachLevelByTime


ClockTime

A time is given by an hour, minute and second.

Source: ISO 19103:2005;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Common:Temporal:ClockTime


Cloud

A hydrometeor consisting of minute particles of liquid water or ice, or of both, suspended in the free air and usually not touching the ground. It may also include larger particles of liquid water or ice and non-aqueous liquid or solid particles such as those present in fumes, smoke and dust.

Source: WMO International Meteorological Vocabulary;
Synonyms: Cloud Layer
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:Cloud

Associations:

Name Type
impacts ATMCommunity


CommencementDeicingTime

Time at which the deicing operation commences.

Source: SESAR;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:AerodromeOperations:Deicing:CommencementDeicingTime

Associations:

Name Type
is start of Deicing


CommercialAirTransportOperation

An aircraft operation involving the transport of passengers, cargo or mail for remuneration or hire.

Source: ICAO Annex 1; ICAO Annex 17; ICAO Annex 6;
Synonyms: Commercial air transport flight
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:CommercialAirTransportOperation


CommonMark

A mark assigned by the International Civil Aviation Organization to the common mark registering authority registering aircraft of an international operating agency on other than a national basis.

Source: ICAO Annex 7;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:Organisation:CommonMark

Associations:

Name Type
assigned to CommonMarkRegisteringAuthority


CommonMarkRegisteringAuthority

The authority maintaining the non-national register or, where appropriate, the part thereof, in which aircraft of an international operating agency are registered.

Source: ICAO Annex 7;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:Organisation:CommonMarkRegisteringAuthority

Associations:

Name Type
registers Aircraft


CommonPoint

A point on the surface of the earth common to the tracks of two aircraft, used as a basis for the application of separation (e.g. significant point, waypoint, navigation aid, fix).

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ConflictManagement:CommonPoint


ConfigurationDeviationList

A list established by the organization responsible for the type design with the approval of the State of Design which identifies any external parts of an aircraft type which may be missing at the commencement of a flight, and which contains, where necessary, any information on associated operating limitations and performance correction.

Source: ICAO Annex 6;
Abbreviations: CDL
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:DocumentAndAgreement:ConfigurationDeviationList

Associations:

Name Type
elaborates TypeCertificate


Conflict

Any situation involving an aircraft and a hazard in which the applicable separation minima may be compromised.

Source: ICAO Doc 9854;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ConflictManagement:Conflict

Associations:

Name Type
is managed if within ConflictHorizon
for other aircraft, occurs at CommonPoint


ConflictHorizon

The extent to which hazards along the aircraft's future trajectory are considered for separation provision.

Source: ICAO Doc 9854;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ConflictManagement:ConflictHorizon

Associations:

Name Type
defines scope of SeparationProvision


ConstrainedAirspaceCrossing

The event of crossing constrained airspace designated as a line.

Source: ICAO;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:FlightEvent:ConstrainedAirspaceCrossing_


ContactInformation

Information required to enable contact with the responsible person and/or organisation.

Source: EUROCONTROL-FAA AIXM v.5.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:OrganisationRoleAndService:ContactInformation


ContinuePresentHeading

Instruction to continue to fly on the current heading.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:ContinuePresentHeading


Contour

An estimated or observed outline of a particular weather situation.

Source: EUROCONTROL-FAA WXXM v.1.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:Contour


ControlArea

A controlled airspace extending upwards from a specified limit above the earth.

Source: ICAO Annex 1; ICAO Annex 11; ICAO Annex 2; ICAO Annex 3;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:Airspace:ControlArea

Associations:

Name Type
is subdivided into ControlSector


ControlAreaBoundaryPoint

A defined point on the control area boundary common to adjacent Air Traffic Service Units.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:TrafficSynchronization:Coordination:ControlAreaBoundaryPoint

Associations:

Name Type
is in AreaOfCommonInterest
is on boundary of ControlArea


ControlledAirspace

An airspace of defined dimensions within which air traffic control service is provided in accordance with the airspace classification.

Source: ICAO Annex 1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:Airspace:ControlledAirspace


ControlSector

A subdivision of a designated control area within which responsibility is assigned to one controller or to a small group of controllers.

Source: ICAO Doc 9426;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:Airspace:ControlSector

Associations:

Name Type
is under the responsibility of RatedAirTrafficController


ControlZone

A controlled airspace extending upwards from the surface of the earth to a specified upper limit.

Source: ICAO Annex 1; ICAO Annex 11; ICAO Annex 2;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:Airspace:ControlZone


Convection

In the atmosphere, convection is the dominant vertical transport process in convective boundary layers, which are common over tropical oceans and, during sunny days, over continents. Moist convection in the atmosphere is characterized by deep, saturated updrafts and downdrafts, and unsaturated downdrafts driven by the evaporation and melting of precipitation. This form of convection is made visible by cumulus clouds and cumulonimbus clouds in the case of precipitation convection.

Source: EUROCONTROL-FAA WXXM v.1.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:Convection

Associations:

Name Type
can produce Lightning


ConvectionCell

A volume of convective air.

Source: SESAR;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:ConvectionCell

Associations:

Name Type
concerns Convection
occurs within Airspace


CoordinatedAirport

Any airport where, in order to land or take-off, it is necessary for an aircraft operator to have been allocated a slot by an appropriate authority.

Source: ICAO Doc 9965;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:AerodromeOperations:AirportSlotManagement:CoordinatedAirport

Associations:

Name Type
requires the use of AirportSlot


CoordinateReferenceSystem

Coordinate system that is related to the real world by a datum.

Source: SESAR;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Common:Geometry:CoordinateReferenceSystem


CoordinationAndTransfer

A dialogue procedure between ATC Units successively in control of a flight, comprising - notification of the flight - coordination of conditions of transfer by the transferring ATC unit - coordination, if necessary, and acceptance of conditions of transfer by the accepting ATC unit - transfer of control to the accepting ATC unit.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:TrafficSynchronization:Coordination:CoordinationAndTransfer

Associations:

Name Type
occurs between AirTrafficControlUnit
transfer occurs at TransferOfControlPoint
occurs between ControlArea


CoordinationMessage

A message transmitted in support of the coordination dialogue between ATS Units.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:InformationServicesProducts:FlightInformationProduct:CoordinationMessage

Associations:

Name Type
is grouped as LogicalAcknowledgementMessage
is consumed by ReceivingUnitOrController
is provided by SendingUnitOrController


Copilot

A licensed pilot serving in any piloting capacity other than as pilot-in-command but excluding a pilot who is on board the aircraft for the sole purpose of receiving flight instruction.

Source: ICAO Annex 1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:Role:Copilot


CorporateAviation

The non-commercial operation or use of aircraft by a company for the carriage of passengers or goods as an aid to the conduct of company business, flown by a professional pilot employed to fly the aircraft. (Note that corporate aviation is a subset of general aviation.)

Source: ICAO Annex 17;
Synonyms: business aviation
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:CorporateAviation


Coulomb

The quantity of electricity transported in 1 second by a current of 1 ampere.

Source: ICAO Annex 5;
Abbreviations: C
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Common:UnitsOfMeasure:Coulomb


Course

The intended direction of travel of an aircraft, expressed in degrees from North (true, magnetic or grid).

Source: ICAO Doc 8168, Vol. I, 5th Ed;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:Movement:Course


CrewMember

A person assigned by an operator to duty on an aircraft during a flight duty period.

Source: ICAO; ICAO Annex 1; ICAO Annex 18; ICAO Annex 6; ICAO Annex 9;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:Agent:CrewMember

Associations:

Name Type
uses AircraftOperatingManual


CrossBorderArea

Airspace of defined dimensions, above the land areas or territorial waters of more than one state.

Source: EUROCONTROL-FAA AIXM v.5.1;
Abbreviations: CBA
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:Airspace:CrossBorderArea

Associations:

Name Type
is above the land areas or territorial waters of State


CrossBorderService

An international shorthaul air service operating across the borders of two contiguous States.

Source: ICAO Doc 9626;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:CrossBorderService


CrossOverAltitudePoint

The point in climb or descent where the airplane will transition between Mach and IAS control.

Source: ICAO;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:Movement:CrossOverAltitudePoint


CrossPositionAtAndMaintainLevel

Instruction that the specified position is to be crossed at the specified level and that level is to be maintained when reached.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:CrossPositionAtAndMaintainLevel


CrossPositionAtAndMaintainLevelAtSpeed

Instruction that the specified position is to be crossed at the specified level and speed, and the level and speed are to be maintained.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:CrossPositionAtAndMaintainLevelAtSpeed


CrossPositionAtLevel

Instruction that the specified position is to be crossed at the specified level. This may require the aircraft to modify its climb or descent profile.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:CrossPositionAtLevel


CrossPositionAtOrAboveLevel

Instruction that the specified position is to be crossed at or above the specified level.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:CrossPositionAtOrAboveLevel


CrossPositionAtOrAfterTime

Instruction that the specified position is to be crossed at or after the specified time.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:CrossPositionAtOrAfterTime


CrossPositionAtOrBeforeTime

Instruction that the specified position is to be crossed at or before the specified time.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:CrossPositionAtOrBeforeTime


CrossPositionAtOrBelowLevel

Instruction that the specified position is to be crossed at or below the specified level.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:CrossPositionAtOrBelowLevel


CrossPositionAtSpeed

Instruction that the specified position is to be crossed at the specified speed and the specified speed is to be maintained until further advised.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:CrossPositionAtSpeed


CrossPositionAtTime

Instruction that the specified position is to be crossed at the specified time.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:CrossPositionAtTime


CrossPositionBetweenLevelAndLevel

Instruction that the specified position is to be crossed at a level between the specified levels.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:CrossPositionBetweenLevelAndLevel


CrossPositionBetweenTimeAndTime

Instruction that the specified position is to be crossed at a time between the specified times.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:CrossPositionBetweenTimeAndTime


CruiseClimb

An aeroplane cruising technique resulting in a net increase in altitude as the aeroplane mass decreases.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:CruiseClimb

Associations:

Name Type
is aeroplane cruising technique during ChangeOfCruiseLevelPhase


CruiseClimbSpeed

The true airspeed to be maintained during cruise climb.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:CruiseClimbSpeed

Associations:

Name Type
is speed to be maintained during ChangeOfCruiseLevelPhase


CruisePhase

The phase of flight from the top of climb to cruise altitude, or flight level, to the start of the descent toward the destination aerodrome or landing site.

Source: ICAO ADREP 2000;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:FlightPhase:CruisePhase


CruiseReliefPilot

A flight crew member who is assigned to perform pilot tasks during cruise flight, to allow the pilot-in-command or a co-pilot to obtain planned rest.

Source: ICAO Annex 6;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:Role:CruiseReliefPilot


CruisingLevel

A level maintained during a significant portion of a flight.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:FlightPhase:CruisingLevel


CruisingSpeed

A true air speed maintained during a significant portion of a flight.

Source:
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:FlightPhase:CruisingSpeed

Associations:

Name Type
is true airspeed at which an aircraft flies during CruisePhase


Cumulonimbus

Dense and heavy cloud with a considerable mountain- or tower-shaped vertical extension. These clouds, the base of which is quite dark, may give rise to thunderstorms and generally heavy precipitation in the form of rain, snow, fine or large hail, sometimes accompanied by strong wind gusts.

Source: ICAO IWXXM;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:Cumulonimbus


Cumulus

Detached cloud, generally dense and with sharp outlines, developing vertically in the form of rising mounds, domes or towers, of which the bulging upper part is often like a cauliflower. The sunlit parts are mostly brilliant white and the base is relatively dark and nearly horizontal. Sometimes Cumulus clouds are ragged.

Source: WMO International Meteorological Vocabulary;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:Cumulus


CurrentFlightPlan

The flight plan, including changes, if any, brought about by subsequent clearances.

This information is transmitted by each ATSU to the next ATSU in case no basic flight plan data (FPL) has already been distributed.

Source: ICAO; ICAO Annex 2;
Abbreviations: CPL
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:InformationServicesProducts:FlightInformationProduct:CurrentFlightPlan

Associations:

Name Type
notifies of upcoming CoordinationAndTransfer
shared when trajectory in AreaOfCommonInterest
is operational reference instance of FlightPlan


DangerArea

An airspace of defined dimensions within which activities dangerous to the flight of aircraft may exist at specified times.

Source: ICAO Annex 1; ICAO Annex 15; ICAO Annex 2; ICAO Annex 4;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:Airspace:DangerArea


DataLinkAutomaticTerminalInformationService

The provision of ATIS via data link.

Source: ICAO Annex 1; ICAO Annex 10;
Abbreviations: D-ATIS
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:AirTrafficServices:DataLinkAutomaticTerminalInformationService


DataLinkVOLMETService

The provision of VOLMET via DataLink.

Source: ICAO Annex 11;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:AirTrafficServices:DataLinkVOLMETService


DataQuality

A degree or level of confidence that the data provided meet the requirements of the data user in terms of accuracy, resolution and integrity.

Source: ICAO Annex 1; ICAO Annex 11; ICAO Annex 14; ICAO Annex 15; ICAO Annex 4;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:InformationServicesProducts:AeronauticalInformationProduct:DataQuality

Associations:

Name Type
requires satisfying requirements in terms of Resolution
requires satisfying requirements in terms of Integrity
requires satisfying requirements in terms of Accuracy


Date

A date gives values for year, month and day.

Source: ISO 19103:2005;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Common:Temporal:Date

Associations:

Name Type
expressed according to Calendar


DateTime

A DateTime is a combination of a date and a time type.

Source: ISO 19103:2005;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Common:Temporal:DateTime


DatumCrossingPoint

The DCP is a point on the glide path directly above the LTP or FTP at a height specified by the RDH.

Source: ICAO Doc 8168, Vol. II, 5th Ed;
Abbreviations: DCP
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:InfrastructurePoint:DatumCrossingPoint


DecisionAltitude

A specified altitude in the precision approach or approach with vertical guidance at which a missed approach must be initiated if the required visual reference to continue the approach has not been established.

Source: ICAO Annex 6;
Abbreviations: DA
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:RouteAndProcedure:DecisionAltitude

Associations:

Name Type
is published for AircraftCategory


DecisionHeight

A specified height in the precision approach or approach with vertical guidance at which a missed approach must be initiated if the required visual reference to continue the approach has not been established.

Source: ICAO Annex 6;
Abbreviations: DH
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:RouteAndProcedure:DecisionHeight

Associations:

Name Type
is published for AircraftCategory


DeclaredCapacity

A measure of the ability of the ATC system or any of its subsystems or operating positions to provide service to aircraft during normal activities. It is expressed as the number of aircraft entering a specified portion of the ATM infrastructure in a given period of time, taking due account of weather, ATC unit configuration, staff and equipment available, and any other factors that may affect the workload of the controller responsible for the infrastructure.

Source: ICAO Annex 1; ICAO Annex 11;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:DemandAndCapacityBalancing:DeclaredCapacity

Associations:

Name Type
defined for SignificantPoint
defined for Aerodrome
defined for Airspace


DegreeCelsius

The special name for the unit kelvin for use in stating values of Celsius temperature.

Source: ICAO Annex 5;
Abbreviations: �C
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Common:UnitsOfMeasure:DegreeCelsius


Deicing

De-icing operation on an aircraft that may consist of removal of snow, ice or frost from the aircraft (de-icing), and/or also application of chemicals that remain on a surface and continue to delay the reformation of ice up (anti-icing).

Source: FOIPS;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:AerodromeOperations:Deicing:Deicing


DeicingArea

An area comprising an inner area for the parking of an aeroplane to receive de-icing / anti-icing treatment and an outer area for the manoeuvring of two or more mobile de-icing / anti-icing equipment.

Source: ICAO; ICAO Annex 1; ICAO Annex 14;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:DeicingArea

Associations:

Name Type
on Taxiway
part of DeicingGroup
located on Apron
located at AircraftStand


DeicingGroup

A group of deicing areas.

Source: EUROCAE ED 99D;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:DeicingGroup


DeicingTime

Duration of the deicing operation.

Source: SESAR;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:AerodromeOperations:Deicing:DeicingTime

Associations:

Name Type
is duration of Deicing


DelayMessage

A message transmitted when the departure of an aircraft, for which basic flight plan data (FPL) has been sent,is delayed by more than 30 minutes after the estimated off-block time contained in the basic flight plan data.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:InformationServicesProducts:FlightInformationProduct:DelayMessage


Demand

The number of aircraft requesting to use the ATM system in a given time period.

Source: ICAO Doc 9854;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:DemandAndCapacityBalancing:Demand


DepartureAirportSlotTime

The time of the Airport Departure Slot as allocated by the Airport Slot Coordinator

Source: SESAR;
Abbreviations: ADST
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:AerodromeOperations:AirportSlotManagement:DepartureAirportSlotTime


DepartureClearance

Authorization for an aircraft to take-off under conditions specified by an air traffic control unit.

Source: ICAO Doc 4444, 15th Ed;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:DepartureClearance


DepartureMessage

A message transmitted (unless otherwise prescribed on the basis of regional air navigation agreements) immediately after the departure of an aircraft for which basic flight plan data (FPL) has been previously distributed.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:InformationServicesProducts:FlightInformationProduct:DepartureMessage


DepartureOperations

The set of flight operations following procedures associated with the departure aerodrome.

Source: SESAR;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:AerodromeOperations:DepartureOperations

Associations:

Name Type
comprises WheelsOff
manages departure of Flight
at Gate
comprises StartUp
comprises TakeOffPhase
follows procedures associated with Aerodrome
starts with OffBlock
followed by ArrivalOperations
uses StandardInstrumentDeparture


DepartureSurfaceSegment

This segment describes the elements of the overall trajectory from the departure gate up to and including the departure runway.

Source: ICAO Doc 9965;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:Movement:DepartureSurfaceSegment

Associations:

Name Type
uses Taxiway
uses Runway
uses AircraftStand
is relevant for DepartureOperations


DescendAtVerticalRateMaximum

Instruction to descend at not above the specified rate.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:DescendAtVerticalRateMaximum


DescendAtVerticalRateMinimum

Instruction to descend at not less than the specified rate.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:DescendAtVerticalRateMinimum


DescendToLevel

Instruction that a descent to a specified level is to commence and once reached the specified level is to be maintained.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:DescendToLevel


DescendToReachLevelByPosition

Instruction that a descent is to commence at a rate such that the specified level is reached at or before the specified position. When this message element is not concatenated with another vertical clearance, the level specified is the assigned level which is to be maintained.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:DescendToReachLevelByPosition


DescendToReachLevelByTime

Instruction that a descent is to commence at a rate such that the specified level is reached at or before the specified time. When this message element is not concatenated with another vertical clearance, the level specified is the assigned level which is to be maintained.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:DescendToReachLevelByTime


DescentFix

A fix established in a precision approach at the FAP to eliminate certain obstacles before the FAP, which would otherwise have to be considered for obstacle clearance purposes.

Source: ICAO Doc 8168, Vol. I, 5th Ed;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:InfrastructurePoint:DescentFix


DesignatedPoint

A geographical location not marked by the site of a radio navigation aid, used in defining an ATS route, the flight path of an aircraft or for other navigation or ATS purposes.

Source: EUROCONTROL-FAA AIXM v.5.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:InfrastructurePoint:DesignatedPoint

Associations:

Name Type
is a named InfrastructurePointUsage
is not marked by the site of RadioNavigationAid


Desired4DTrajectory

The current 4D trajectory that is requested and generated by the airspace user with knowledge of the ATM system's operational constraints and resource contention.

Source: ICAO Doc 9965;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:Desired4DTrajectory

Associations:

Name Type
is representation of Trajectory for AirspaceUser
represents the best suited Ranked4DTrajectory
reflects the most recent Airspace User request during TrajectorySynchronisation


DiplomaticClearance

A special permission for military transport aircraft of the participants to fly over each other country's territory and to land at and take-off from military and civilian airports (to the exception of the airports and/or areas specifically mentioned in a list of exempted airports and/or areas to be completed by each participant) whilst adhering to all national rules, international agreements, ICAO rules, restrictions described in the national military and civilian Aeronautical Information Publications, ATC regulations, NOTAMs or other special requirements.

Source: EU/EC European Defence Agency;
Abbreviations: DIC
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:MilitaryOperations:DiplomaticClearance

Associations:

Name Type
from State


DirectFlightSegment

A direct flight (DCT) between two specified significant points.

Source: SESAR;
Abbreviations: DCT
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:Movement:DirectFlightSegment

Associations:

Name Type
to InfrastructurePoint


DirectionFinder

An electronic device used to determine the position of a radio source by means of directional antennas, which receives the strongest radio signal when it is pointing directly at the transmitter.

Source: EUROCONTROL-FAA AIXM v.5.1;
Abbreviations: DF
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:NavigationInfrastructure:DirectionFinder


Disembarkation

The leaving of an aircraft after a landing, except by crew or passengers continuing on the next stage of the same through-flight.

Source: ICAO Annex 9;
Synonyms: Deboarding
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:AerodromeOperations:Turnaround:Disembarkation

Associations:

Name Type
is sub-process GroundHandling
enabled by Gate
from Aircraft


DistressPhase

A situation wherein there is reasonable certainty that an aircraft and its occupants are threatened by grave and imminent danger or require immediate assistance.

Source: ICAO Annex 12;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:EmergencyOperations:DistressPhase


DME

Ultra High Frequency (UHF) ground equipment that is used in conjunction with airborne equipment to determine distance between the airborne and ground equipment.

Source: EUROCONTROL-FAA AIXM v.5.1;
Synonyms: Distance Measuring Equipment
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:NavigationInfrastructure:DME


DockingArea

A defined area on a seaplane base either fixed or floating, intended to accommodate aircraft for purposes of loading or unloading passengers or cargo, refueling, parking, or maintenance.

Source: FAA (Federal Aviation Administration);
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:DockingArea

Associations:

Name Type
includes Gangway
includes MarineRailway
includes Pier
includes FloatingDockSite
includes capability to Hoist
includes FloatingBarge


Document

A piece of written, printed, or electronic matter that provides information or evidence or that serves as an official record.

Source: Oxford English Dictionary;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:OrganisationRoleAndService:Document


DomesticAirService

An air service operated wholly within the territory of a State.

Source: ICAO Doc 9626;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:DomesticAirService


Drizzle

Fairly uniform precipitation in very fine drops of water (diameter less than 0.5 mm) very close to one another, falling from a cloud.

Source: WMO International Meteorological Vocabulary;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:Drizzle


Duration

Lasting, continuance in time; the continuance or length of time; the time during which a thing, action, or state continues.

Source: Oxford English Dictionary;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Common:Temporal:Duration

Associations:

Name Type
has Period
is a concept of Time


Dust

Earth or other solid matter in a minute and fine state of subdivision, so that the particles are small and light enough to be easily raised and carried in a cloud by the wind; any substance comminuted or pulverized; powder.

Source: Oxford English Dictionary;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:Dust


DustStorm

An ensemble of particles of dust energetically lifted to great heights by a strong and turbulent wind.

Source: WMO International Meteorological Vocabulary;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:DustStorm


DustWhirl

An ensemble of particles of dust or sand, sometimes accompanied by small litter, raised from the ground in the form of a whirling column of varying height with a small diameter and an approximately vertical axis.

Source: WMO International Meteorological Vocabulary;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:DustWhirl


ElevatedHeliport

A heliport located on a raised structure on land.

Source: ICAO Annex 1; ICAO Annex 14; ICAO Annex 6;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:ElevatedHeliport


Elevation

The vertical distance of a point or a level, on or affixed to the surface of the earth, measured from mean sea level.

Source: ICAO Annex 1; ICAO Annex 10; ICAO Annex 3; ICAO Annex 4;
Synonyms: gravity-related height
Abbreviations: ELEV
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Common:Geometry:Elevation


Embarkation

The boarding of an aircraft for the purpose of commencing a flight, except by such crew or passengers as have embarked on a previous stage of the same through-flight.

Source: ICAO Annex 9;
Synonyms: Boarding
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:AerodromeOperations:Turnaround:Embarkation

Associations:

Name Type
enabled by Gate
is sub-process GroundHandling
into Aircraft


EmergencyLocatorTransmitter

A generic term describing equipment which broadcast distinctive signals on designated frequencies and, depending on application, may be automatically activated by impact or be manually activated.

Source: ICAO Annex 6;
Abbreviations: ELT
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Aircraft:EmergencyLocatorTransmitter


EmergencyMessage

Message used during emergency phases as per ICAO Annex 12, or other emergency (such as radio communications failure, unlawful interference or passenger illness).

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:InformationServicesProducts:FlightInformationProduct:EmergencyMessage


EmergencyPhase

A generic term meaning, as the case may be, uncertainty phase, alert phase or distress phase.

Source: ICAO Annex 11;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:EmergencyOperations:EmergencyPhase

Associations:

Name Type
may apply to Flight


EndDeicingTime

Time at which the deicing operation ends.

Source: SESAR;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:AerodromeOperations:Deicing:EndDeicingTime

Associations:

Name Type
is end of Deicing


EndOfExpectVectors

The end of the vectoring, when procedures specify "Expect Vectors".

Source: ICAO;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:FlightEvent:EndOfExpectVectors


EndOfLandingRoll

The event of coming to a full stop on the arrival runway.

Source: ICAO;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:FlightEvent:EndOfLandingRoll

Associations:

Name Type
marks the end of the LandingRoll


EndPredictionPoint

The final point at which a prediction was made.

Source: ICAO;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:Movement:EndPredictionPoint


EndStay

The termination of an operation at which the flight remained for some time.

Source: ICAO;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:FlightEvent:EndStay

Associations:

Name Type
marks the end of StayPhase


Engine

A unit used or intended to be used for aircraft propulsion. It consists of at least those components and equipment necessary for functioning and control, but excludes the propeller/rotors (if applicable).

Source: ICAO; ICAO Annex 6; ICAO Annex 8;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Aircraft:Engine


EnRouteClearance

A clearance covering the flight path of an aircraft after take-off to the point at which an approach to land is expected to commence.

Note.- In some circumstances it may be necessary to subdivide this clearance, e.g. into sections divided by control area boundaries or into the departure, climb, or descent phases of flight.

Source: ICAO Doc 9426;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:EnRouteClearance


EnRouteDelay

A time duration for which a flight is expected to loiter; i.e. they will depart from IFR operations at the associated point and expect to request resumption of IFR operations after the indicated duration.

Source: ICAO;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:EnRouteDelay

Associations:

Name Type
at TrajectoryPoint


EnRouteHolding

The phase of flight, in which a pre-determined ad-hoc manoeuvre occurs, which keeps the aircraft within a specified airspace en-route awaiting further instructions.

Source: ICAO ADREP 2000;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:FlightPhase:EnRouteHolding

Associations:

Name Type
may be based on HoldingProcedure


EnRoutePhase

The phase of flight from the completion of initial climb at the departure aerodrome to the completion of controlled descent to the outer marker [ifr] or [vfr] to completion of the controlled descent to the vfr pattern or 1,500 feet [450 metres] above runway end elevation, whichever comes first.

Source: ICAO ADREP 2000;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:FlightPhase:EnRoutePhase

Associations:

Name Type
includes EnRouteHolding
includes CruisePhase
includes ClimbToCruisingLevelOrAltitude
includes ChangeOfCruiseLevelPhase
authorized by EnRouteClearance


EntryIntoAnRestrictedOrReservedAirspace

The event of entering an airspace restriction/reservation.

Source: ICAO;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:FlightEvent:EntryIntoAnRestrictedOrReservedAirspace

Associations:

Name Type
marks the entry into AirspaceRestriction


EntryIntoConstrainedAirspace

The event of crossing into designated constrained airspace.

Source: ICAO;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:FlightEvent:EntryIntoConstrainedAirspace


EstimatedCommencementOfDeicingTime

The estimated time when de-icing operations on an aircraft are expected to start.

Source: EUROCONTROL A-CDM Implementation manual;
Abbreviations: ECZT
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:AerodromeOperations:Deicing:EstimatedCommencementOfDeicingTime


EstimatedDeicingTime

Time difference between the Estimated End of De-icing Time (EEZT) minus the Estimated Commencement of De-icing Time (ECZT).

Source: EUROCONTROL A-CDM Implementation manual;
Abbreviations: EDIT
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:AerodromeOperations:Deicing:EstimatedDeicingTime


EstimatedElapsedTime

The estimated time required to proceed from one significant point to another.

Source: ICAO Doc 4444;
Abbreviations: EET
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:EstimatedElapsedTime

Associations:

Name Type
is time required to complete TrajectorySegment


EstimatedElapsedTimeReporting

The reporting of the estimated elapsed time.

Source: ICAO;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:FlightEvent:EstimatedElapsedTimeReporting

Associations:

Name Type
happens at PrescribedEETReportingPoint
is about reporting EstimatedElapsedTime
may be prescribed when crossing FlightInformationRegion


EstimatedEndOfDeicingTime

The estimated time when de-icing operations on an aircraft are expected to end.

Source: EUROCONTROL A-CDM Implementation manual;
Abbreviations: EEZT
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:AerodromeOperations:Deicing:EstimatedEndOfDeicingTime


EstimatedInBlockTime

The estimated time that an aircraft will arrive in-block.

Source: EUROCONTROL A-CDM Implementation manual;
Synonyms: Airline/Handler ETA
Abbreviations: EIBT
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:FlightEvent:EstimatedInBlockTime


EstimatedLandingTime

The estimated time that an aircraft will land.

Source: SESAR;
Synonyms: Estimated Runway Time; Estimated Time of Arrival
Abbreviations: ELDT
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:FlightEvent:EstimatedLandingTime

Associations:

Name Type
is EstimatedTimeOver
is estimated time at Threshold


EstimatedOffBlockTime

The estimated time at which the aircraft will commence movement associated with departure.

Source: ICAO Annex 2;
Abbreviations: EOBT
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:FlightEvent:EstimatedOffBlockTime


EstimatedTakeOffTime

The estimated take-off time taking into account the Estimated Off-Block Time plus the Estimated Taxi-Out Time.

Source: EUROCONTROL ATM Lexicon;
Abbreviations: ETOT
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:FlightEvent:EstimatedTakeOffTime


EstimatedTakeOffWeight

The estimated takeoff weight of the aircraft.

Source: FIXM v3.0;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Aircraft:EstimatedTakeOffWeight


EstimatedTimeOfArrival

For IFR flights, the time at which it is estimated that the aircraft will arrive over that designated point, defined by reference to navigation aids, from which it is intended that an instrument approach procedure will be commenced, or, if no navigation aid is associated with the aerodrome, the time at which the aircraft will arrive over the aerodrome. For VFR flights, the time at which it is estimated that the aircraft will arrive over the aerodrome.

Source: ICAO; ICAO Annex 2;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:FlightEvent:EstimatedTimeOfArrival

Associations:

Name Type
indicates the time at which a VFR flight (or IFR flight under certain circumstances) will fly over Aerodrome


EstimatedTimeOver

The time at which it is estimated that the flight will pass a point on its intended trajectory.

Source: ICAO Doc 4444;
Synonyms: Estimated Time of Arrival
Abbreviations: ETO
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:FlightEvent:EstimatedTimeOver


EstimateMessage

A message transmitted by each ACC for flight information centre to the next ACC or flight information centre along the route of flight. It is transmitted at least 20 minutes before the time at which the aircraft is estimated to pass the transfer of control point or boundary point at which it comes under the control of such unit, unless another period of time has been prescribed by the appropriate ATS authority.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:InformationServicesProducts:FlightInformationProduct:EstimateMessage

Associations:

Name Type
may refer to TransferOfControlPoint
may refer to ControlAreaBoundaryPoint
proposes conditions in CoordinationAndTransfer


Event

An action which occurs at an Instant.

Source: ISO 19108:2002;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Common:Temporal:Event


Executed4DTrajectory

The actual 4D trajectory of the aircraft from the start-up to the present position.

Source: ICAO Doc 9965;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:Movement:Executed4DTrajectory

Associations:

Name Type
is representation of 4DTrajectory
is constrained by AircraftCapability


ExitFromRestrictedORReservedAirspace

The event of exiting from an airspace restriction/reservation.

Source: ICAO;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:FlightEvent:ExitFromRestrictedORReservedAirspace

Associations:

Name Type
marks the exit from AirspaceRestriction


ExitIntoConstrainedAirspace

The event of exiting from designated constrained airspace.

Source: ICAO;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:FlightEvent:ExitIntoConstrainedAirspace


ExtendedFlightOverWater

A flight operated over water at a distance of more than 93 km (50 NM), or 30 minutes at normal cruising speed, whichever is the lesser, away from land suitable for making an emergency landing.

Source: ICAO Annex 6;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:ExtendedFlightOverWater


Farad

The capacitance of a capacitor between the plates of which there appears a difference of potential of 1 volt when it is charged by a quantity of electricity equal to 1 coulomb.

Source: ICAO Annex 5;
Abbreviations: F
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Common:UnitsOfMeasure:Farad


FFICEInformation

A generic construct representing the information that is exchanged globally between Airspace users, Aerodrome operators, ATM service providers, Airspace providers and Emergency service providers, as prescribed by ICAO Doc 9965.

Source: SESAR;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:InformationServicesProducts:FlightInformationProduct:FFICEInformation

Associations:

Name Type
is global representation of Flight for ATMCommunity
is technically originated by Agent
is global representation of Flight
is updated in support of TrajectorySynchronisation
is exchanged in support of TacticalOperationalPlanning
is exchanged in support of SchedulingAndStrategicActivities
is exchanged in support of PreTacticalOperationalPlanning


FictitiousThresholdPoint

The FTP is a point over which the final approach segment path passes at a relative height specified by the reference datum height. It is defined by the WGS-84 latitude, longitude and ellipsoid height. The FTP replaces the LTP when the final approach course is not aligned with the runway extended centreline or when the threshold is displaced from the actual runway threshold. For non-aligned approaches the FTP lies on the intersection of the perpendicular from the FAS to the runway threshold. The FTP elevation is the same as the actual runway threshold elevation.

Source: ICAO Doc 8168, Vol. II, 5th Ed;
Abbreviations: FTP
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:InfrastructurePoint:FictitiousThresholdPoint


Filed4DTrajectory

The 4D trajectory filed by the FF-ICE enabled airspace user (eAU) with the FF-ICE enabled Air Traffic Management Service Providers (eASP).

Source: FIXM v3.0;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:Filed4DTrajectory

Associations:

Name Type
is filed by Airspace User during TrajectorySynchronisation


FiledFlightPlan

The flight plan as filed with an ATS unit by the pilot or a designated representative, without any subsequent changes.

Source: ICAO;
Abbreviations: FPL
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:InformationServicesProducts:FlightInformationProduct:FiledFlightPlan

Associations:

Name Type
is a filed FlightPlan
information is generated by Operator
is received by AirTrafficServicesReportingOffice


FinalApproach

That part of an instrument approach procedure which commences at the specified final approach fix or point, or where such a fix or point is not specified, a) at the end of the last procedure turn, base turn or inbound turn of a racetrack procedure, if specified; or b) at the point of interception of the last track specified in the approach procedure; and ends at a point in the vicinity of an aerodrome from which: 1) a landing can be made; or 2) a missed approach procedure is initiated.

Source: ICAO ADREP 2000; ICAO Annex 1; ICAO Annex 11; ICAO Annex 4;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:RouteAndProcedure:FinalApproach

Associations:

Name Type
is part of InstrumentApproachProcedure


FinalApproachAndTakeOffArea

A defined area over which the final phase of the approach manoeuvre to hover or landing is completed and from which the take-off manoeuvre is commenced. Where the FATO is to be used by helicopters operating in performance Class 1, the defined area includes the rejected take-off area available.

Source: ICAO Annex 14;
Abbreviations: FATO
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:FinalApproachAndTakeOffArea

Associations:

Name Type
part of Heliport


FinalApproachFix

That fix or point of an instrument approach procedure where the final approach segment commences.

Source: ICAO Annex 4;
Synonyms: FinalApproachPoint
Abbreviations: FAF
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:InfrastructurePoint:FinalApproachFix


FinalApproachSegment

That segment of an instrument approach procedure in which alignment and descent for landing are accomplished.

Source: ICAO; ICAO Annex 4;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:RouteAndProcedure:FinalApproachSegment

Associations:

Name Type
has part aligned with runway centerline described by FinalApproachTrack
has published VerticalPathAngle
has GlidePath
may end at MissedApproachPoint
may end at LandingThresholdPoint
starts at FinalApproachFix


FinalApproachTrack

The flight track in the final approach segment that is normally aligned with the runway centreline. For offset final approach segments, the final approach track is aligned with the orientation of the FTP and the FPAP.

Source: ICAO Doc 8168, Vol. II, 5th Ed;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:RouteAndProcedure:FinalApproachTrack

Associations:

Name Type
is normally aligned with RunwayCentreLine
has alignment defined by FlightPathAlignmentPoint
for offset procedure, has aligment defined by FictitiousThresholdPoint


FIRBoundaryCrossing

The event of crossing from one FIR into another.

Source: ICAO;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:FlightEvent:FIRBoundaryCrossing

Associations:

Name Type
marks the crossing between FlightInformationRegion


FireFightingService

An airport service that provides rescue and fire fighting capabilities for aircraft in emergency at and around the airport.

Source: EUROCONTROL-FAA AIXM v.5.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:AirTrafficServices:FireFightingService


FixBalancing

A tactical ATFM measure aiming at distributing demand and avoiding delays whereby the aircraft is assigned a different arrival or departure fix than the one indicated in the flight plan.

Source: ICAO Doc 9971;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:DemandAndCapacityBalancing:FixBalancing


FixToleranceArea

An area surrounding an intersection within which the corresponding point may be. The dimensions of the fix tolerance area are determined by the system use accuracy of the navigation aid(s) on which the fix is based.

Source: ICAO Doc 8168, Vol. II, 5th Ed;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:InfrastructurePoint:FixToleranceArea


Flight

The operation of an aircraft which, in the case of a manned aircraft, takes place between the time any person boards the aircraft with the intention of flight until such time as all such persons have disembarked, or in the case of an unmanned aircraft, takes place between the time the aircraft is ready to move with the purpose of flight until such time as it comes to rest at the end of the flight and the primary propulsion system is shut down.

Source: ICAO Annex 13;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:Flight

Associations:

Name Type
may be identified by AircraftIdentification
may be identified by GloballyUniqueFlightIdentifier
may be identified by SSRCode
has predicted movement described by 4DTrajectory
has predicted movement described by FlightRoute
is conducted in accordance with FlightRules
has crew CrewMember
is operated by Operator
may have FlightStatus
has FlightCapability
joins FormationFlight
leaves FormationFlight
is divided into FlightPhase
has take-off alternate Aerodrome
intends to land at Aerodrome
has (alternative) destination aerodrome Aerodrome
has ETOPS en-route alternate Aerodrome
has en-route alternate Aerodrome
when controlled is subject to CoordinationAndTransfer
executes Mission
may require SpecialHandling
plan cleared by DepartureClearance
may have OperatorFlightPriority
uses Airspace
is configured during execution in FlightConfiguration
is enabled by Aircraft


FlightCapability

The capabilities of the flight comprising of the: a) presence of relevant serviceable equipment on board the aircraft; b) equipment and capabilities commensurate with flight crew qualifications; and c) where applicable, authorization from the appropriate authority.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:FlightCapability

Associations:

Name Type
depends on FlightCrewApplicationAndApproval
can meet RequiredCommunicationPerformance
can meet RequiredNavigationPerformance
depends on AircraftCapability


FlightConditionCombination

A combination of conditions involving: 1) an operator such as \"AND\", \"OR\", \"AND NOT\", \"SEQUENCE\", \"NONE\" and 2) one or more operands, each of these being either a condition element or another combination of conditions.

Source: EUROCONTROL-FAA AIXM v.5.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:DemandAndCapacityBalancing:FlightConditionCombination

Associations:

Name Type
is a combination of FlightConditionElement


FlightConditionElement

An operand in a flight condition combination.

Source: EUROCONTROL-FAA AIXM v.5.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:DemandAndCapacityBalancing:FlightConditionElement

Associations:

Name Type
may refer to Aerodrome
may refer to AircraftCapability
may refer to FlightCrewApplicationAndApproval
may refer to Airspace


FlightConfiguration

Configuration of aircraft in operation.

Source: SESAR;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Aircraft:FlightConfiguration


FlightCrewApplicationAndApproval

Equipment and procedures for which the air crew is qualified.

Source: ICAO Doc 9965;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:Agent:FlightCrewApplicationAndApproval


FlightCrewMember

A licensed crew member charged with duties essential to the operation of an aircraft during a flight duty period.

Source: ICAO Annex 1; ICAO Annex 11; ICAO Annex 18; ICAO Annex 2; ICAO Annex 3; ICAO Annex 6;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:Agent:FlightCrewMember

Associations:

Name Type
has FlightCrewApplicationAndApproval


FlightDeck

Term encompassing the flight crew and/or aircraft systems.

Source: ICAO Doc 9854;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:Agent:FlightDeck

Associations:

Name Type
executes PilotInCommand
operated by Operator
in uncontrolled airspace executes Separator
encompasses CrewMember
issues CurrentFlightPlan


FlightEvent

An event happening to a given flight.

Source:
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:FlightEvent:FlightEvent

Associations:

Name Type
may mark the start or end of FlightPhase
falls within FlightPhase


FlightInformationCentre

A unit established to provide flight information service and alerting service.

Source: ICAO Annex 1; ICAO Annex 11; ICAO Annex 2; ICAO Annex 3;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:Organisation:FlightInformationCentre

Associations:

Name Type
provides FlightInformationService
provides AlertingService


FlightInformationRegion

An airspace of defined dimensions within which flight information service and alerting service are provided.

Source: ICAO Annex 1; ICAO Annex 11; ICAO Annex 2; ICAO Annex 3; ICAO Annex 4;
Abbreviations: FIR
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:Airspace:FlightInformationRegion

Associations:

Name Type
contains ControlledAirspace


FlightInformationService

A service provided for the purpose of giving advice and information useful for the safe and efficient conduct of flights.

Source: ICAO Annex 1; ICAO Annex 10; ICAO Annex 11; ICAO Annex 2;
Abbreviations: FIS
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:AirTrafficServices:FlightInformationService

Associations:

Name Type
is provided within FlightInformationRegion


FlightIntent

The future aircraft trajectory expressed as a 4-D profile until destination (taking account of aircraft performance, weather, terrain, and ATM service constraints), calculated and "owned" by the aircraft flight management system, and agreed by the pilot.

Source: ICAO Doc 9854;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:Movement:FlightIntent


FlightLevel

A surface of constant atmospheric pressure which is related to a specific pressure datum, 1 013.2 hectopascals (hPa), and is separated from other such surfaces by specific pressure intervals.

Source: ICAO Annex 1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Common:UnitsOfMeasure:FlightLevel


FlightManual

A manual, associated with the certificate of airworthiness, containing limitations within which the aircraft is to be considered airworthy, and instructions and information necessary to the flight crew members for the safe operation of the aircraft.

Source: ICAO Annex 6;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:DocumentAndAgreement:FlightManual

Associations:

Name Type
elaborates TypeCertificate


FlightOperationsOfficerOrFlightDispatcher

A person designated by the operator to engage in the control and supervision of flight operations, whether licensed or not, suitably qualified in accordance with Annex 1, who supports, briefs and/or assists the pilot-in-command in the safe conduct of the flight.

Source: ICAO Annex 6;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:Role:FlightOperationsOfficerOrFlightDispatcher

Associations:

Name Type
assists PilotInCommand
files FiledFlightPlan
signs OperationalFlightPlan


FlightPathAlignmentPoint

A point in the same lateral plane as the LTP or FTP that is used to define the alignment of the final approach segment. For approaches aligned with the runway centreline, the FPAP is located at or beyond the opposite threshold of the runway. The delta length offset from the opposite threshold of the runway defines its location.

Source: ICAO Doc 8168, Vol. II, 5th Ed;
Abbreviations: FPAP
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:InfrastructurePoint:FlightPathAlignmentPoint


FlightPhase

A period-in-time occurrence during a Flight.

Source: SESAR;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:FlightPhase:FlightPhase


FlightPlan

Specified information provided to air traffic services units, relative to an intended flight or portion of a flight of an aircraft.

Source: ICAO;
Synonyms: ICAO Flight Plan, ATC Flight Plan
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:InformationServicesProducts:FlightInformationProduct:FlightPlan

Associations:

Name Type
is accepted / rejected by FormalOrganisation
is technically originated by Agent
information is generated by Agent
is representation of OperationalFlightPlan


FlightRestriction

A rule meant to regulate the use of the route network, by identifying a set of flights which fulfil a combination of elementary flow conditions and either forbidding them on a particular routing or obliging them to follow one routing out of a set of mandatory alternatives.

Source: EUROCONTROL-FAA AIXM v.5.1;
Synonyms: FlowRestriction
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:DemandAndCapacityBalancing:FlightRestriction

Associations:

Name Type
regulates the use of FlightRestrictionRoute
is applicable to flights that fulfil FlightConditionCombination


FlightRestrictionLevel

A single level or a level band associated with a flight restriction, either condition or routing element.

Source: EUROCONTROL-FAA AIXM v.5.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:DemandAndCapacityBalancing:FlightRestrictionLevel


FlightRestrictionRoute

A sequence of routing elements (points, route portions or airspace) that must/must not appear in the specified order in the flight plan of an aircraft fulfilling the conditions of the related Flight Restriction.

Source: EUROCONTROL-FAA AIXM v.5.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:DemandAndCapacityBalancing:FlightRestrictionRoute

Associations:

Name Type
is a sequence of FlightRoutingElement


FlightRoute

The path of a flight over the surface of the earth, including also altitude and speed information.

Source: FIXM v3.0;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:Movement:FlightRoute

Associations:

Name Type
has RoutePoint
has DirectFlightSegment
is a subset of 4DTrajectory
uses ATSRoute


FlightRoutingElement

An airspace, route or point that is concerned by a specified flight restriction.

Source: EUROCONTROL-FAA AIXM v.5.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:DemandAndCapacityBalancing:FlightRoutingElement


FlightRules

The regulations that govern all aspects of operations under which the pilot flies.

Source: FIXM v3.0;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:FlightRules


FlightRulesChange

A change in flight rules during the execution of the flight.

Source:
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:FlightEvent:FlightRulesChange

Associations:

Name Type
is change of FlightRules


FlightSafetyDocumentsSystem

A set of interrelated documentation established by the operator, compiling and organizing information necessary for flight and ground operations, and comprising, as a minimum, the operations manual and the operator's maintenance control manual.

Source: ICAO Annex 6;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:DocumentAndAgreement:FlightSafetyDocumentsSystem

Associations:

Name Type
contains OperationsManual
contains OperatorsMaintenanceControlManual


FlightStatus

An indication of whether a given aircraft requires special handling by air traffic services units or not.

Source: ICAO Doc 9426;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:FlightStatus

Associations:

Name Type
indicates whether the flight requires SpecialHandling


FloatingBarge

A long, large, usually flatbottom boat for transporting freight that is generally unpowered and towed or pushed by other craft. A barge anchored offshore makes an excellent seaplane service facility. An office, lounge, or shop is normally included "aboard;" and floating docks can be added alongside the barge. The barge may be anchored directly to the shore or to a pier by booms and a gangway or anchored offshore in a fixed position.

Source: FAA (Federal Aviation Administration);
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:FloatingBarge


FloatingDockSite

Floating facility which can serve as a mooring place for vessels or as a floating dry dock.

Source: EUROCONTROL-FAA AIXM v.5.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:FloatingDockSite


FlyByWaypoint

A waypoint which requires turn anticipation to allow tangential interception of the next segment of a route or procedure.

Source: ICAO Doc 9713;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:InfrastructurePoint:FlyByWaypoint


FlyHeading

Instruction to fly on the specified heading.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:FlyHeading


FlyoverWaypoint

A waypoint at which a turn is initiated in order to join the next segment of a route or procedure.

Source: ICAO Doc 9713;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:InfrastructurePoint:FlyoverWaypoint


Fog

A suspension of very small, usually microscopic water droplets in the air, reducing visibility at the Earth's surface.

Source: WMO International Meteorological Vocabulary;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:Fog


The length equal to 0.304 8 metre exactly.

Source: ICAO Annex 5;
Abbreviations: ft
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Common:UnitsOfMeasure:Foot


Forecast

A statement of expected meteorological conditions for a specified time or period, and for a specified area or portion of airspace.

Source: ICAO Annex 1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:InformationServicesProducts:MeteorologicalInformationProduct:Forecast


FormalOrganisation

An organisation which is recognized in the world at large, in particular in legal jurisdiction, with associated rights and responsibilities

Source: W3C Organization Ontology;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:OrganisationRoleAndService:FormalOrganisation

Associations:

Name Type
issues Document


FormationFlight

A flight consisting of more than one aircraft which, by prior arrangement between the pilots, operates as a single aircraft with regard to navigation and position reporting, as well as clearances issued by ATC.

Source: SESAR;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:FormationFlight

Associations:

Name Type
merges into FormationFlight
splits from FormationFlight
operates as Flight
is formed by Aircraft


FreeTextEmergencyMessage

Generic message applicable in all situations when no standardised emergency of AIDC message can be applied.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:InformationServicesProducts:FlightInformationProduct:FreeTextEmergencyMessage


FuelEndurance

The estimated maximum length of time the aircraft can spend in the cruise phase of flight, determined by the amount of fuel at take-off.

Source: FIXM v3.0;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:FuelEndurance

Associations:

Name Type
is maximum time the aircraft can spend in CruisePhase


FunnelCloud

Cloud formed at the core of a waterspout or tornado vortex, sometimes extending right down to the ground, caused by the reduction of pressure at the centre of the vortex.

Source: WMO International Meteorological Vocabulary;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:FunnelCloud


G-AIRMET

A graphical AIRMET report.

Source: ICAO; ICAO Annex 3;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:InformationServicesProducts:MeteorologicalInformationProduct:G-AIRMET

Associations:

Name Type
may be represented as AIRMET


G-SIGMET

A graphical SIGMET report.

Source: ICAO; ICAO Annex 3;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:InformationServicesProducts:MeteorologicalInformationProduct:G-SIGMET

Associations:

Name Type
may be represented as SIGMET


GalacticCosmicRay

Highly energetic radiation thought to be created by supernovae, etc., where the outer layers of an exploding star are shock-accelerated to enormous speeds. This radiation, primarily protons, crosses the galaxy and possibly even between galaxies.

Source: FAA (Federal Aviation Administration);
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:GalacticCosmicRay


GAMET

An area forecast in abbreviated plain language for low-level flights for a flight information region or sub-area thereof, prepared by the meteorological office designated by the meteorological authority concerned and exchanged with meteorological offices in adjacent flight information regions, as agreed between the meteorological authorities concerned.

Source: ICAO Annex 3;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:InformationServicesProducts:MeteorologicalInformationProduct:GAMET


Gangway

A variable-sloped pedestrian walkway that links a fixed structure or land with a floating structure.

Source: FAA (Federal Aviation Administration);
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:Gangway


Gate

Access to an airport terminal on the passenger side.

Source: SESAR;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:Gate

Associations:

Name Type
gives access to Terminal
serves AircraftStand


GBASAzimuthReferencePoint

The GARP is defined to be beyond the FPAP along the procedure centreline by a fixed offset of 305 m (1 000 ft). It is used to establish the lateral deviation display limits.

Source: ICAO Doc 8168, Vol. II, 5th Ed;
Abbreviations: GARP
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:InfrastructurePoint:GBASAzimuthReferencePoint


GeneralAviationOperation

An aircraft operation other than a commercial air transport operation or an aerial work operation.

Source: ICAO Annex 1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:GeneralAviationOperation


GeomagneticActivity

Disturbances in the geomagnetic field caused by gusts in the solar wind that blows by the Earth.

Source: FAA (Federal Aviation Administration);
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:GeomagneticActivity


GeometricalTaxiRoute

Geometrical representation of "TaxiRoute". The geometrical route consists of Nodes and Edges.

Source: SESAR;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:Movement:GeometricalTaxiRoute

Associations:

Name Type
is taxi route represention for avionic system TaxiPath
is derived from AerodromeSurfaceRoutingNetwork


Geometry

Geometry constructs used to describe the physical shape of entities.

Source: SESAR;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Common:Geometry:Geometry

Associations:

Name Type
uses given CoordinateReferenceSystem


GlidePath

A descent profile determined for vertical guidance during a final approach.

Source: ICAO Annex 4;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:RouteAndProcedure:GlidePath

Associations:

Name Type
may be given by NavigationAidInfrastructure


GloballyUniqueFlightIdentifier

A single reference for FF-ICE information pertinent to a flight that is unique globally.

Source: ICAO Doc 9965;
Abbreviations: GUFI
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:FlightIdentifier:GloballyUniqueFlightIdentifier


A worldwide position and time determination system that includes one or more satellite constellations, aircraft receivers and system integrity monitoring, augmented as necessary to support the required navigation performance for the intended operation.

Source: ICAO Doc 9881;
Abbreviations: GNSS
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:NavigationInfrastructure:GlobalNavigationSatelliteSystem


GregorianCalendar

Calendar in general use; first introduced in 1582 to define a year that more closely approximates the tropical year than the Julian calendar (ISO 19108).

Source: ICAO Annex 1; ICAO Annex 11; ICAO Annex 14; ICAO Annex 15; ICAO Annex 4;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Common:Temporal:GregorianCalendar


GroundBasedFix

A specified geographical location used in describing the base or airspace infrastructure, which is found by reference to radio navigation aids.

Source:
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:InfrastructurePoint:GroundBasedFix

Associations:

Name Type
might be Waypoint
references RadioNavigationAid
has FixToleranceArea


GroundDelayProgramme

A strategic, pre-tactical, or tactical ATFM measure where aircraft are held on the ground in order to manage capacity and demand in a specific volume of airspace or at a specific airport.

Source: ICAO Doc 9971;
Abbreviations: GDP
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:DemandAndCapacityBalancing:GroundDelayProgramme


GroundEarthStation

An earth station in the fixed satellite service, or, in some cases, in the aeronautical mobile-satellite service, located at a specified fixed point on land to provide a feeder link for the aeronautical mobile satellite service.

Source: ICAO Annex 10, Vol. III, Second Edition;
Synonyms: AeronauticalEarthStation
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:CommunicationInfrastructure:GroundEarthStation


GroundHandling

Services necessary for an aircraft's arrival at, and departure from, an airport, other than air traffic services.

Source: ICAO Annex 6;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:AerodromeOperations:Turnaround:GroundHandling

Associations:

Name Type
ends at OffBlockReady


GroundLightSystem

One or more light sources located on the ground that provide visual assistance for air and ground navigation.

Source: EUROCONTROL-FAA AIXM v.5.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:GroundLightSystem

Associations:

Name Type
on VerticalStructure
provided for GuidanceLine
provided for Taxiway
provided for TouchDownLiftOff
provided for TaxiwayHoldingPosition
provided for RunwayDirection
provided for Apron


GroundStop

A tactical ATFM measure where some selected aircraft remain on the ground.

Source: ICAO Doc 9971;
Abbreviations: GS
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:DemandAndCapacityBalancing:GroundStop


GroundTrafficControlService

An ATC service provided for the purpose of: (a) preventing collisions on the manoeuvring area between aircraft and between aircraft and obstacles or vehicles; and (b) expediting and maintaining an orderly flow of aircraft operating on the manoeuvring area.

Source:
Synonyms: Ground control
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:AirTrafficServices:GroundTrafficControlService


GuidanceLine

A line used to guide aircraft on and between airport movement areas.

Source: EUROCONTROL-FAA AIXM v.5.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:GuidanceLine

Associations:

Name Type
connects Runway
connects Taxiway
connects TouchDownLiftOff
connects RunwayCentrelinePoint
connects Apron
connects AircraftStand


Hail

Precipitation of either transparent, or partly or completely opaque particles of ice (hailstones), usually spheroidal, conical or irregular in form and of diameter very generally between 5 and 50 millimetres, which falls from a cloud either separately or agglomerated into irregular lumps.

Source: WMO International Meteorological Vocabulary;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:Hail


Hazard

The objects or elements that an aircraft can be separated from. These are: other aircraft, terrain, weather, wake turbulence, incompatible airspace activity and, when the aircraft is on the ground, surface vehicles and other obstructions on the apron and manoeuvring area.

Source: ICAO Doc 9854;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ConflictManagement:Hazard

Associations:

Name Type
includes Terrain


Haze

Suspension in the atmosphere of extremely small, dry particles which are invisible to the naked eye but numerous enough to give the sky an opalescent appearance.

Source: WMO International Meteorological Vocabulary;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:Haze


Heading

The direction in which the longitudinal axis of an aircraft is pointed, usually expressed in degrees from North (true, magnetic, compass or grid).

Source: ICAO;
Abbreviations: HDG
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:Movement:Heading


Height

The vertical distance of a level, a point or an object considered as a point, measured from a specified datum.

Source: ICAO Annex 10; ICAO Annex 11; ICAO Annex 15; ICAO Annex 2; ICAO Annex 3; ICAO Annex 4;
Abbreviations: HGT
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Common:Geometry:Height


HelicopterAirTaxiwayAndTaxiRoute

A defined path on the surface established for the air taxiing of helicopters.

Source: ICAO Annex 14;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:HelicopterAirTaxiwayAndTaxiRoute

Associations:

Name Type
defined for Heliport


HelicopterClearway

A defined area on the ground or water, selected and/or prepared as a suitable area over which a helicopter operated in performance class 1 may accelerate and achieve a specific height.

Source: ICAO Annex 1; ICAO Annex 14;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:HelicopterClearway

Associations:

Name Type
defined for Heliport


HelicopterGroundTaxiwayAndTaxiRoute

A ground taxiway and taxi route intended for the ground movement of wheeled undercarriage helicopters.

Source: ICAO Annex 1; ICAO Annex 14;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:HelicopterGroundTaxiwayAndTaxiRoute

Associations:

Name Type
defined for Heliport


Helideck

A heliport located on an offshore structure such as an exploration or production platform used for the exploitation of oil or gas.

Source: ICAO Annex 1; ICAO Annex 14; ICAO Annex 6;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:Helideck


Heliport

An aerodrome or a defined area on a structure intended to be used wholly or in part for the arrival, departure and surface movement of helicopters.

Source: ICAO Annex 1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:Heliport

Associations:

Name Type
can be on VerticalStructure
alternate Heliport
has AerodromeReferencePoint
can be Aerodrome


Henry

The inductance of a closed circuit in which an electromotive force of 1 volt is produced when the electric current in the circuit varies uniformly at a rate of 1 ampere per second.

Source: ICAO Annex 5;
Abbreviations: H
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Common:UnitsOfMeasure:Henry


Hertz

The frequency of a periodic phenomenon of which the period is 1 second.

Source: ICAO Annex 5;
Abbreviations: Hz
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Common:UnitsOfMeasure:Hertz


A constituent mobile subnetwork of the aeronautical telecommunication network (ATN), operating in the aeronautical mobile (R) high frequency bands. In addition, the HFDL may provide non-ATN functions, such as direct link service (DLS). The HFDL system must enable aircraft to exchange data with ground-based users.

Source: ICAO Annex 10, Vol. III, Second Edition;
Abbreviations: HFDL
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:CommunicationInfrastructure:HighFrequencyDataLink


Hoist

A hoist is a device used for lifting or lowering a load by means of a drum or lift-wheel around which rope or chain wraps. It may be manually operated, electrically or pneumatically driven and may use chain, fiber or wire rope as its lifting medium. The load is attached to the hoist by means of a lifting hook.

Source: FAA (Federal Aviation Administration);
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:Hoist


HoldAtPositionAsPublishedMaintainLevel

Instruction to enter a holding pattern with the published characteristics at the specified position and level.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:HoldAtPositionAsPublishedMaintainLevel


HoldEntry

The event of entering into planned holding.

Source: ICAO;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:FlightEvent:HoldEntry

Associations:

Name Type
marks the start of ApproachHolding
marks the start of EnRouteHolding


HoldExit

The event of exiting from planned holding.

Source: ICAO;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:FlightEvent:HoldExit

Associations:

Name Type
marks the end of EnRouteHolding
marks the end of ApproachHolding


HoldingAssessment

The geometry of surfaces that define altitude levels and the structure of an area used to evaluate obstacles for determining holding patterns.

Source: EUROCONTROL-FAA AIXM v.5.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:Obstacle:HoldingAssessment

Associations:

Name Type
uses ObstacleAssessmentArea
analyses the protection against obstacles of HoldingProcedure


HoldingBay

A defined area where aircraft can be held, or bypassed, to facilitate efficient surface movement of aircraft.

Source: ICAO Annex 14;
Synonyms: Holding
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:HoldingBay


HoldingFix

A geographical location that serves as a reference for a holding procedure.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:InfrastructurePoint:HoldingFix


HoldingProcedure

A predetermined manoeuvre which keeps an aircraft within a specified airspace while awaiting further clearance.

Source: ICAO Annex 4;
Synonyms: HoldingPattern
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:RouteAndProcedure:HoldingProcedure

Associations:

Name Type
can be described, as part of a Terminal Procedure, as SegmentLeg
has Geometry
is based on HoldingFix
has span defined using TM_Duration
has span defined using Distance


ICAOAircraftCategory

Classification of aircraft according to specified basic characteristics, e.g. aeroplane, helicopter, glider, free balloon.

Source: ICAO Annex 1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Aircraft:ICAOAircraftCategory


ICAOAircraftTypeCode

The ICAO designator of an aircraft type as published in ICAO doc 8643.

Source: SESAR;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Aircraft:ICAOAircraftTypeCode


IceCrystals

Any one of a number of macroscopic crystalline forms of ice including hexagonal columns and platelets, dendritic crystals, ice needles and their combinations.

Source: WMO International Meteorological Vocabulary;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:IceCrystals


IcePellets

Precipitation of transparent particles of ice which are spherical or irregular, rarely conical, and which have a diameter of 5 mm or less.

Source: WMO International Meteorological Vocabulary;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:IcePellets


Icing

Formation of ice, rime, or hoarfrost on an aircraft in flight.

Source: EUROCONTROL-FAA WXXM v.1.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:Icing


IFRFlight

A flight conducted in accordance with the instrument flight rules.

Source: ICAO Annex 2;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:IFRFlight


ILSProtectionArea

An area protecting ILS signal distortion by forbidding large objects in the area.

Source: EUROCONTROL-FAA AIXM v.5.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:ILSProtectionArea

Associations:

Name Type
protects signal distortion of InstrumentLandingSystem


Imbalance

An occurrence when the traffic demand exceeds the available capacity.

Source: SESAR;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:DemandAndCapacityBalancing:Imbalance


InBlock

The arrival of the aircraft at its parking position.

Source: SESAR;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:FlightEvent:InBlock

Associations:

Name Type
in-blocks at InBlockTime
qualifies ArrivalSurfaceSegment
in AircraftStand
followed by GroundHandling


InBlockTime

The time that an aircraft arrives in-blocks.

Source: SESAR;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:FlightEvent:InBlockTime


InCloudTurbulence

Upper-atmospheric turbulence encountered by an aircraft when flying through a cloud.

Source: SESAR;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:InCloudTurbulence

Associations:

Name Type
inside Cloud


IncreaseSpeedToSpeed

Instruction that the present speed is to be increased to the specified speed and maintained until further advised.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:IncreaseSpeedToSpeed


IncreaseSpeedToSpeedOrGreater

Instruction that the present speed is to be increased to the specified speed or greater, and maintained at or above the specified speed until further advised.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:IncreaseSpeedToSpeedOrGreater


IndicatedAirspeed

The uncorrected reading on the airspeed indicator.

Source: ICAO Doc 9426;
Abbreviations: IAS
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:IndicatedAirspeed


IndicatorAndSignalingDevice

Indicator enabling visual communication to a pilot, in particular in case of two ways communications failure, of some information important for landing (wind direction, runway in use direction).

Source: ICAO Annex 14;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:IndicatorAndSignalingDevice


InformationService

A service that consists in the provision of aeronautical, meteorological, traffic and related information to aircraft crew and other actors involved in flight operations, in flight or on the ground.

Source: EUROCONTROL-FAA AIXM v.5.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:AirTrafficServices:InformationService


InfrastructurePoint

A point used in describing the base or airspace infrastructure.

Source:
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:InfrastructurePoint:InfrastructurePoint

Associations:

Name Type
has InfrastructurePointUsage


InfrastructurePointUsage

The usage of a point when describing the Airspace or Base Infrastructure.

Source: SESAR;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:InfrastructurePoint:InfrastructurePointUsage


InitialApproachFix

A fix that marks the beginning of the initial segment and the end of the arrival segment, if applicable.

Source: ICAO Doc 8168, Vol. I, 5th Ed;
Abbreviations: IAF
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:InfrastructurePoint:InitialApproachFix


InitialApproachSegment

That segment of an instrument approach procedure between the initial approach fix and the intermediate approach fix or, where applicable, the final approach fix or point.

Source: ICAO Annex 4;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:RouteAndProcedure:InitialApproachSegment

Associations:

Name Type
connects to IntermediateApproachSegment
connects to FinalApproachSegment
ends at IntermediateFix
starts at InitialApproachFix


InitialPredictionPoint

The initial point at which a prediction was made.

Source: ICAO;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:Movement:InitialPredictionPoint


Instant

The 0-dimensional primitive in time, equivalent to a point in space. An instant occupies a single temporal position in a given temporal reference system.

Source: ISO 19108:2002;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Common:Temporal:Instant

Associations:

Name Type
is a concept of Time
occurs at Event
expressed as DateTime
expressed as Date
expressed as ClockTime


InstrumentApproachProcedure

A series of predetermined manoeuvres by reference to flight instruments with specified protection from obstacles from the initial approach fix, or where applicable, from the beginning of a defined arrival route to a point from which a landing can be completed and thereafter, if a landing is not completed, to a position at which holding or en-route obstacle clearance criteria apply.

Source: ICAO; ICAO Annex 2; ICAO Annex 4;
Abbreviations: IAP
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:RouteAndProcedure:InstrumentApproachProcedure

Associations:

Name Type
includes IntermediateApproachSegment
has Minima
includes MissedApproachProcedure
includes InitialApproachSegment
includes FinalApproachSegment


InstrumentFlightRules

A set of rules governing the conduct of flight under instrument meteorological conditions.

Source: ICAO Doc 9426;
Abbreviations: IFR
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:InstrumentFlightRules


InstrumentLandingSystem

A combination of radio navigation services intended to facilitate aircraft in landing by providing lateral and vertical guidance including indications of distance from the optimum point of landing.

Source: EUROCONTROL ATM Lexicon;
Abbreviations: ILS
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:NavigationInfrastructure:InstrumentLandingSystem


IntegratedAeronauticalInformationPackage

A package which consists of the following elements: - AIP, including amendment service; - Supplements to the AIP; - NOTAM and PIB; - AIC; and - checklists and lists of valid NOTAM.

Source: ICAO Annex 15;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:InformationServicesProducts:AeronauticalInformationProduct:IntegratedAeronauticalInformationPackage

Associations:

Name Type
has requirements in terms of Traceability
has requirements in terms of DataQuality


Integrity

A degree of assurance that an aeronautical data and its value has not been lost nor altered since the data origination or authorized amendment.

Source: ICAO Annex 1; ICAO Annex 11; ICAO Annex 14; ICAO Annex 15;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:InformationServicesProducts:AeronauticalInformationProduct:Integrity


IntermediateApproachSegment

That segment of an instrument approach procedure between either the intermediate approach fix and the final approach fix or point, or between the end of a reversal, racetrack or dead reckoning track procedure and the final approach fix or point, as appropriate.

Source: ICAO Annex 4;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:RouteAndProcedure:IntermediateApproachSegment

Associations:

Name Type
connects to FinalApproachSegment
starts at IntermediateFix
ends at FinalApproachFix


IntermediateFix

A fix that marks the end of an initial segment and the beginning of the intermediate segment.

Source: ICAO Doc 8168, Vol. I, 5th Ed;
Abbreviations: IF
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:InfrastructurePoint:IntermediateFix


InternationalAirService

An air service that passes through the airspace over the territory of more than one State.

Source: ICAO Doc 9626;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:InternationalAirService


InternationalNOTAMOffice

An office designated by a State for the exchange of NOTAM internationally.

Source: ICAO Annex 1; ICAO Annex 11; ICAO Annex 15;
Abbreviations: NOF
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:Organisation:InternationalNOTAMOffice


InternationalOperatingAgency

An agency of the kind contemplated in Article 77 of the Convention.

Source: ICAO Annex 7;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:Organisation:InternationalOperatingAgency

Associations:

Name Type
registers aircraft for CommonMarkRegisteringAuthority


Intersection

A geographical location expressed as radials, bearings and/or distances from two radio navigation aids.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Common:Geometry:Intersection

Associations:

Name Type
is based on RadioNavigationAid
is based on Angle


IonosphericStorm

Turbulence in the F region of the ionosphere, usually due to a sudden burst of radiation from the Sun.

Source: WMO International Meteorological Vocabulary;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:IonosphericStorm


JetStream

Flat tubular, quasi-horizontal, current of air generally near the tropopause, whose axis is along a line of maximum speed and which is characterized by great speeds and strong vertical and horizontal wind shears.

Source: WMO International Meteorological Vocabulary;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:JetStream


Joule

The work done when the point of application of a force of 1 newton is displaced a distance of 1 metre in the direction of the force.

Source: ICAO Annex 5;
Abbreviations: J
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Common:UnitsOfMeasure:Joule


Kelvin

A unit of thermodynamic temperature which is the fraction 1/273.16 of the thermodynamic temperature of the triple point of water.

Source: ICAO Annex 5;
Abbreviations: K
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Common:UnitsOfMeasure:Kelvin


Kilogram

The unit of mass equal to the mass of the international prototype of the kilogram.

Source: ICAO Annex 5;
Abbreviations: kg
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Common:UnitsOfMeasure:Kilogram


Knot

The speed equal to 1 nautical mile per hour.

Source: ICAO Annex 5;
Abbreviations: kt
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Common:UnitsOfMeasure:Knot


LandingAndTakeOffFlightPhases

The LTO flight phases are composed by the Take-off, Landing, Climb Out, Approach, Taxi in, and Taxi Out. For Emissions impact assessments, the LTO phases are commonly associated to flight levels under FL30.

Source: ICAO Annex 16;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:FlightPhase:LandingAndTakeOffFlightPhases

Associations:

Name Type
includes StandingPhase
includes TakeOffPhase
includes LandingPhase
includes ClimbToCruisingLevelOrAltitude
includes ApproachPhase


LandingDistanceAvailable

The length of runway which is declared available and suitable for the ground run of an aeroplane landing.

Source: ICAO Annex 14;
Abbreviations: LDA
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:LandingDistanceAvailable


LandingDistanceAvailableForHelicopter

The length of the FATO plus any additional area declared available and suitable for helicopters to complete the landing manoeuvre from a defined height.

Source: ICAO Annex 14;
Abbreviations: LDAH
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:LandingDistanceAvailableForHelicopter


LandingPhase

The phase of flight from the point of transition from nose-low to nose-up attitude, immediately before landing (flare), through touchdown and until aircraft exits landing runway or comes to a stop, whichever occurs first.

Source: ICAO ADREP 2000;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:FlightPhase:LandingPhase

Associations:

Name Type
includes LandingRoll
includes LevelOffTouchdown
on RunwayDirection


LandingRoll

The phase of flight from touchdown until the aircraft exits the landing runway or comes to a stop, whichever occurs first.

Source: ICAO ADREP 2000;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:FlightPhase:LandingRoll


LandingThresholdPoint

The LTP is a point over which the glide path passes at a relative height specified by the reference datum height. It is defined by the WGS-84 latitude, longitude and ellipsoid height. The LTP is normally located at the intersection of the runway centreline and threshold.

Source: ICAO Doc 8168, Vol. II, 5th Ed;
Abbreviations: LTP
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:InfrastructurePoint:LandingThresholdPoint

Associations:

Name Type
is normally located at Threshold


LandingTime

Time at which an aircraft touches down.

Source: SESAR;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:FlightEvent:LandingTime


LateralChange

A change of course, track direction or heading during the execution of the flight.

Source: ICAO;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:FlightEvent:LateralChange

Associations:

Name Type
is change of Heading
is change of direction of Track
is change of Course


LateralConstraint

A restriction brought to the lateral component of the trajectory of an aircraft.

Source: SESAR;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:Movement:LateralConstraint

Associations:

Name Type
requires EnRouteHolding
requires ApproachHolding
requires OverPoint


LateralSeparationMinima

The minimum distance (plus buffer) between intended routes of the aircraft being separated.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ConflictManagement:LateralSeparationMinima


Level

A generic term relating to the vertical position of an aircraft in flight and meaning variously, height, altitude or flight level.

Source: ICAO Annex 1; ICAO Annex 11; ICAO Annex 2; ICAO Annex 3; ICAO Annex 4;
Abbreviations: LVL
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:Movement:Level

Associations:

Name Type
can be expressed as FlightLevel
can be expressed as Height
can be expressed as Altitude


LevelChange

A change in level during the execution of the flight.

Source:
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:FlightEvent:LevelChange

Associations:

Name Type
is change of Level


LevelOffTouchdown

The phase of flight from the point of transition from nose-low to nose-up attitude, just before landing, until touchdown.

Source: ICAO ADREP 2000;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:FlightPhase:LevelOffTouchdown


LicensingAuthority

The Authority designated by a Contracting State as responsible for the licensing of personnel.

Source: ICAO Annex 1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:Organisation:LicensingAuthority


Lightning

Luminous manifestation accompanying a sudden electrical discharge which takes place from or inside a cloud or, less often, from high structures on the ground or from mountains.

Source: WMO International Meteorological Vocabulary;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:Lightning


Line

A connected sequence of points.

Source: ICAO Doc 9881;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Common:Geometry:Line

Associations:

Name Type
is made up of Point


Litre

A unit of volume restricted to the measurement of liquids and gases which is equal to 1 cubic decimetre.

Source: ICAO Annex 5;
Abbreviations: L
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Common:UnitsOfMeasure:Litre


Location

An office or other premises at which the organization is located.

Source: W3C Organization Ontology;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:OrganisationRoleAndService:Location


LocationIndicator

A four-letter code group formulated in accordance with rules prescribed by ICAO and assigned to the location of an aeronautical fixed station.

Source: ICAO Annex 1; ICAO Annex 10;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:CommunicationInfrastructure:LocationIndicator


LogicalAcknowledgementMessage

A message transmitted by the computer of the accepting unit to indicate that a current flight plan or estimate message has been received and processed up to the point where the operational content will be received by the appropriate controller.

This message shall only be used between ATC computers.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:InformationServicesProducts:FlightInformationProduct:LogicalAcknowledgementMessage


LongitudinalSeparationMinima

The minimum spacing between the estimated positions of the aircraft being separated. The spacing may be based on time or distance.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ConflictManagement:LongitudinalSeparationMinima


LowLevelWindShear

Wind shear below 2000 feet AGL, exceeding 10 knots per 100 feet (vector difference between two points in space).

Source: FAA (Federal Aviation Administration);
Abbreviations: LLWS
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:LowLevelWindShear


Lumen

The luminous flux emitted in a solid angle of 1 steradian by a point source having a uniform intensity of 1 candela.

Source: ICAO Annex 5;
Abbreviations: lm
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Common:UnitsOfMeasure:Lumen


MaintainLevel

Instruction to maintain the specified level.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:MaintainLevel


MaintainSpeed

Instruction that the specified speed is to be maintained.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:MaintainSpeed


MaintainSpeedOrGreater

Instruction that the specified speed or a greater speed is to be maintained.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:MaintainSpeedOrGreater


MaintainSpeedOrLess

Instruction that the specified speed or a lesser speed is to be maintained.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:MaintainSpeedOrLess


ManoeuvringArea

That part of an aerodrome to be used for the take-off, landing and taxiing of aircraft, excluding aprons.

Source: ICAO; ICAO Annex 1; ICAO Annex 14;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:ManoeuvringArea

Associations:

Name Type
part of MovementArea
on Aerodrome


ManualSurfaceWeatherObservation

Manual Surface Weather Observation

Source: FAA (Federal Aviation Administration);
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:ManualSurfaceWeatherObservation

Associations:

Name Type
observed by WeatherObserver


ManufacturerConfiguration

Predefined aircraft configuration specified and delivered by the manufacturer of the aircraft or aircraft equipment(s).

Source: SESAR;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Aircraft:ManufacturerConfiguration

Associations:

Name Type
is activated by Operator
constrains OperatorConfiguration
accomodates a maximum number of Passenger
has MaximumTakeOffWeight
depends on AircraftSeries
depends on AircraftModel
depends on AircraftMake


MarineRailway

A seaplane hauling system using a rolling carriage running from the water to a repair facility ashore. The vessel to be hauled is floated to a position over the carriage and secured with chocks, then the carriage is hauled up the tracks using a cable winch.

Source: FAA (Federal Aviation Administration);
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:MarineRailway


MarkerBeacon

A radio navigation service identifying a particular location in space by means of a 75 megahertz (MHz) transmitter which transmits a directional signal to be received by aircraft flying overhead.

Source: Aeronautical Information Feature Data Dictionary (AIFDD);
Synonyms: Marker Radio Beacon
Abbreviations: MKR
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:NavigationInfrastructure:MarkerBeacon

Associations:

Name Type
marks VerticalStructure


Marking

A symbol or group of symbols displayed on the surface of the movement area in order to convey aeronautical information.

Source: ICAO; ICAO Annex 1; ICAO Annex 14; ICAO Annex 4;
Synonyms: Aerodrome Markings
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:Marking

Associations:

Name Type
displayed on MovementArea


MarkingBuoy

A floating object moored to the bottom in a particular place, as an aid to navigation or for other specific purposes.

Source: DGIWG;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:MarkingBuoy


MaximumTakeOffWeight

The maximum weight at which the aircraft is certified for take-off due to structural or other limits.

Source: SESAR;
Synonyms: Maximum Take-off Mass, Maximum mass
Abbreviations: MTOW
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Aircraft:MaximumTakeOffWeight


MeanSeaLevel

The average location of the interface between the ocean and the atmosphere, over a period of time sufficiently long so that all random and periodic variations of short duration average to zero.

Source: ICAO Doc 9881;
Abbreviations: MSL
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Common:Geometry:MeanSeaLevel


Membership

The nature of the membership of the agent.

Source: W3C Organization Ontology;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:OrganisationRoleAndService:Membership

Associations:

Name Type
fulfils Role


METAR

Aerodrome report on routine observations for dissemination beyond the aerodrome of origin.

Source: ICAO; ICAO Annex 3;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:InformationServicesProducts:MeteorologicalInformationProduct:METAR


MeteorologicalAuthority

The authority providing or arranging for the provision of meteorological service for international air navigation on behalf of a Contracting State.

Source: ICAO; ICAO Annex 3;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:Organisation:MeteorologicalAuthority

Associations:

Name Type
is empowered by MeteorologicalOffice


MeteorologicalForecast

A statement of expected meteorological conditions for a specified time or period, and for a specified area or portion of airspace.

Source: ICAO; ICAO Annex 3;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:MeteorologicalForecast

Associations:

Name Type
concerns WeatherPhenomenon
is established for TrajectoryPoint


MeteorologicalObservation

The evaluation of one or more meteorological elements.

Source: ICAO; ICAO Annex 3;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:MeteorologicalObservation

Associations:

Name Type
concerns WeatherPhenomenon


MeteorologicalOffice

An office designated to provide meteorological service for international air navigation.

Source: ICAO Annex 1; ICAO Annex 11; ICAO Annex 3;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:Organisation:MeteorologicalOffice


MeteorologicalReport

A statement of observed meteorological conditions related to a specified time and location.

Source: ICAO; ICAO Annex 3;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:InformationServicesProducts:MeteorologicalInformationProduct:MeteorologicalReport


MeteorologicalWatchOffice

An office designated to provide information concerning the occurrence or expected occurrence of specified en-route weather and other phenomena in the atmosphere that may affect the safety of aircraft operations within its specified area of responsibility.

Source: ICAO Annex 1; ICAO Annex 11; ICAO Annex 3;
Abbreviations: MWO
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:Organisation:MeteorologicalWatchOffice


Metre

The distance travelled by light in a vacuum during 1/299 792 458 of a second.

Source: ICAO Annex 5;
Abbreviations: m
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Common:UnitsOfMeasure:Metre


METREPORT

Local report on routine observations for dissemination at the aerodrome of origin.

Source: ICAO Annex 3;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:InformationServicesProducts:MeteorologicalInformationProduct:METREPORT


MicrowaveLandingSystem

A precision approach and landing guidance system operating in the microwave spectrum, which provides position information and various ground-to-air data.

Source: EUROCONTROL ATM Lexicon;
Abbreviations: MLS
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:NavigationInfrastructure:MicrowaveLandingSystem


MilesInTrail

A tactical ATFM measure expressed as the number of miles required between aircraft (in addition to the minimum longitudinal requirements) to meet a specific criterion which may be separation, airport, fix, altitude, sector or route specific.

Source: ICAO Doc 9971;
Abbreviations: MIT
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:DemandAndCapacityBalancing:MilesInTrail


MilitaryFlight

Operations of the armed forces other than those for remuneration which should be covered under public transport operations.

Source: ICAO ADREP 2000;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:MilitaryFlight


MilitaryTrainingRouteBuffer

A control area or portion thereof, established in the form of a corridor around a military training route in order to protect it from other traffic.

Source: EUROCONTROL-FAA AIXM v.5.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:Airspace:MilitaryTrainingRouteBuffer


Minima

Vertical and horizontal visual minima for a procedure segment conditions such as aircraft category, navigation equipment usage, procedure type, altimeter, etc.

Source: EUROCONTROL-FAA AIXM v.5.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:RouteAndProcedure:Minima


MinimumDescentAltitude

A specified altitude in a non-precision approach or circling approach below which descent must not be made without the required visual reference.

Source: ICAO Annex 6;
Abbreviations: MDA
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:RouteAndProcedure:MinimumDescentAltitude

Associations:

Name Type
is published for AircraftCategory


MinimumDescentHeight

A specified height in a non-precision approach or circling approach below which descent must not be made without the required visual reference.

Source: ICAO Annex 6;
Abbreviations: MDH
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:RouteAndProcedure:MinimumDescentHeight_

Associations:

Name Type
is published for AircraftCategory


MinimumEnRouteAltitude

The altitude for an en-route segment that provides adequate reception of relevant navigation facilities and ATS communications, complies with the airspace structure and provides the required obstacle clearance.

Source: ICAO Annex 1; ICAO Annex 15; ICAO Annex 4;
Abbreviations: MEA
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:RouteAndProcedure:MinimumEnRouteAltitude

Associations:

Name Type
provides adequate reception of relevant navigation facilities and ATS communications for RouteSegment
provides clearance from Obstacle


MinimumObstacleClearanceAltitude

The minimum altitude for a defined segment of flight that provides the required obstacle clearance.

Source: ICAO Annex 1; ICAO Annex 15; ICAO Annex 4;
Abbreviations: MOCA
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:RouteAndProcedure:MinimumObstacleClearanceAltitude

Associations:

Name Type
provides the required obstacle clearance for RouteSegment
provides clearance from Obstacle


MinimumSectorAltitude

The lowest altitude which may be used which will provide a minimum clearance of 300 m (1 000 ft) above all objects located in an area contained within a sector of a circle of 46 km (25 NM) radius centred on a radio aid to navigation.

Source: ICAO;
Abbreviations: MSA
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:RouteAndProcedure:MinimumSectorAltitude

Associations:

Name Type
is centred on SignificantPoint
is established in the area around Heliport
is established in the area around Aerodrome


MinutesInTrail

A tactical ATFM measure expressed as the number of minutes required between successive aircraft.

Source: ICAO Doc 9971;
Abbreviations: MINIT
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:DemandAndCapacityBalancing:MinutesInTrail


MissedApproachHoldingFix

A fix used in RNAV applications that marks the end of the missed approach segment and the centre point for the missed approach holding.

Source: ICAO Doc 8168, Vol. I, 5th Ed;
Abbreviations: MAHF
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:InfrastructurePoint:MissedApproachHoldingFix


MissedApproachPoint

That point in an instrument approach procedure at or before which the prescribed missed approach procedure must be initiated in order to ensure that the minimum obstacle clearance is not infringed.

Source: ICAO Annex 4;
Abbreviations: MAPT
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:InfrastructurePoint:MissedApproachPoint


MissedApproachProcedure

The procedure to be followed if the approach cannot be continued.

Source: ICAO Annex 4;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:RouteAndProcedure:MissedApproachProcedure

Associations:

Name Type
starts at MissedApproachPoint
may end at MissedApproachHoldingFix


Mission

Operation carried out by an aircraft or a group of aircraft used in military service.

Source: SESAR;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:MilitaryOperations:Mission

Associations:

Name Type
requires DiplomaticClearance


Mist

Suspension in the air of microscopic water droplets or wet hygroscopic particles which reduce the visibility at the Earth's surface.

Source: WMO International Meteorological Vocabulary;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:Mist


ModeSSubnetwork

A means of performing an interchange of digital data through the use of secondary surveillance radar (SSR) Mode S interrogators and transponders in accordance with defined protocols.

Source: ICAO Annex 10, Vol. III, Second Edition;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:CommunicationInfrastructure:ModeSSubnetwork


MountainObscuration

Description of a visibility condition that is distinguished from IFR because ceilings, by definition, are described as "above ground level" (AGL). In mountainous terrain clouds can form at altitudes significantly higher than the weather reporting station and at the same time nearby mountain tops may be obscured by low visibility. In these areas the ground level can also vary greatly over a small area.

Source: EUROCONTROL-FAA WXXM v.1.1;
Abbreviations: MTOS
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:MountainObscuration


MountainWave

Atmospheric internal gravity waves, which are periodic changes of atmospheric pressure, temperature and orthometric height in a current of air.

Source: ICAO Annex 3;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:MountainWave


MovementArea

That part of an aerodrome to be used for the take-off, landing and taxiing of aircraft, consisting of the manoeuvring area and the apron(s).

Source: ICAO; ICAO Annex 1; ICAO Annex 15;
Synonyms: Aerodrome Movement Area
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:MovementArea

Associations:

Name Type
may include Bridge
part of Aerodrome


MovementPreference

Movement preferences submitted by flight planners for consideration by the TFM automation in the event that a Traffic Management Initiative becomes necessary. For example: preferring a southerly course deviation if a re-route is necessary, preferring a ground delay over a reroute for pre-departure flights, any reroute less than 120 nm or less is acceptable, etc.

Source: ICAO Doc 9965;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:InformationServicesProducts:FlightInformationProduct:MovementPreference


NationalityMark

A nationality symbol included in the radio call signs allocated to the State of Registry by the International Telecommunication Union.

Source: ICAO Annex 7;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:Organisation:NationalityMark

Associations:

Name Type
allocated to StateOfRegistry


NationalRegisteringAuthority

The authority maintaining the national register or, where appropriate, the part thereof, in which aircraft are registered.

Source: ICAO Annex 7;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:Organisation:NationalRegisteringAuthority

Associations:

Name Type
registers aircraft for Operator
registers Aircraft


NauticalMile

The length equal to 1 852 metres exactly.

Source: ICAO Annex 5;
Abbreviations: NM
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Common:UnitsOfMeasure:NauticalMile


Space-based and or ground-based navigation aids available to meet the requirements in the navigation specification.

Source: ICAO Doc 9613, 2nd Ed;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:NavigationInfrastructure:NavigationAidInfrastructure


An area specified by sectors with altitude or procedure descent gradient limitations for omnidirectional departures or Pilot navigation area.

Source: EUROCONTROL-FAA AIXM v.5.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:Airspace:NavigationArea

Associations:

Name Type
may be subdivided into NavigationAreaSector


Subdivision of a sector to allow for different altitudes or gradients.

Source: EUROCONTROL-FAA AIXM v.5.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:Airspace:NavigationAreaSector


NDB

A low or medium radio navigation service transmitting signals whereby the pilot of a suitably equipped aircraft can determine bearings, 'home in' on, and/or track to or from the station.

Source: Aeronautical Information Feature Data Dictionary (AIFDD);
Synonyms: Non-Directional Radio Beacon
Abbreviations: NDB
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:NavigationInfrastructure:NDB


Negotiating4DTrajectory

A 4D trajectory proposed by airspace user or ASP as a potential agreed 4D trajectory.

Source: ICAO Doc 9965;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:Negotiating4DTrajectory

Associations:

Name Type
represents a particular status of the trajectory during TrajectorySynchronisation


NetworkStation

An aeronautical station forming part of a radiotelephony network.

Source: ICAO Annex 10, Vol. II, Sixth Edition;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:CommunicationInfrastructure:NetworkStation

Associations:

Name Type
belongs to RadiotelephonyNetwork


Newton

The force which when applied to a body having a mass of 1 kilogram gives it an acceleration of 1 metre per second squared.

Source: ICAO Annex 5;
Abbreviations: N
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Common:UnitsOfMeasure:Newton


Night

The hours between the end of evening civil twilight and the beginning of morning civil twilight or such other period between sunset and sunrise, as may be prescribed by the appropriate authority.

Source: ICAO Annex 1; ICAO Annex 6;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Common:Temporal:Night


Nimbostratus

Grey cloud layer, often dark, the appearance of which is rendered diffuse by more or less continuously falling rain or snow, which in most cases reaches the ground. It is thick enough throughout to blot out the Sun. Low, ragged clouds frequently occur below the layer, with which they may or may not merge.

Source: WMO International Meteorological Vocabulary;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:Nimbostratus


NonAutomatedWeatherObservationInstrument

Non-Automated Weather Observation Instrument

Source: FAA (Federal Aviation Administration);
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:NonAutomatedWeatherObservationInstrument


NonAutomatedWeatherObservationSource

Weather sources that tend to be manual in nature.

Source: FAA (Federal Aviation Administration);
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:NonAutomatedWeatherObservationSource


NonMovementArea

Area where aircraft cannot be seen by a control tower and therefore are restricted to move.

Source: EUROCONTROL-FAA AIXM v.5.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:NonMovementArea

Associations:

Name Type
on Aerodrome


NonPrecisionApproachProcedure

Non-precision approach (NPA) procedure. An instrument approach procedure which utilizes lateral guidance but does not utilize vertical guidance.

Source: ICAO;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:RouteAndProcedure:NonPrecisionApproachProcedure

Associations:

Name Type
has MinimumDescentHeight
has MinimumDescentAltitude


NonScheduledInternationalFlight

Any international flight performed other than as a scheduled international air service.

Source: ICAO Doc 9626;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:NonScheduledInternationalFlight


NonScheduledOperation

Any air service that is performed other than as a scheduled air service, including but not limited to charter operations.

Source: ICAO Doc 9626;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:NonScheduledOperation


NonScheduledRevenueOperation

Charter flight or special flight performed for remuneration other than scheduled flight.

Source: ICAO ADREP 2000;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:NonScheduledRevenueOperation


NormalDescent

FR: Descent from cruise to either Initial Approach Fix (IAF) or VFR pattern entry. VFR: Descent from cruise to the VFR pattern entry or 1000 feet above the runway elevation, whichever comes first.

Source: ICAO ADREP 2000;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:FlightEvent:NormalDescent


NormalOperatingZone

Airspace of defined dimensions extending to either side of an ILS localizer course and/or MLS final approach track. Only the inner half of the normal operating zone is taken into account in independent parallel approaches.

Source: ICAO Doc 4444;
Abbreviations: NOZ
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:Airspace:NormalOperatingZone

Associations:

Name Type
extends to either side of final approach track MicrowaveLandingSystem
extends to either side of localizer course InstrumentLandingSystem


NoSpeedRestriction

Notification that the aircraft may keep its preferred speed without restriction.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:NoSpeedRestriction


NOTAM

A notice distributed by means of telecommunication containing information concerning the establishment, condition or change in any aeronautical facility, service, procedure or hazard, the timely knowledge of which is essential to personnel concerned with flight operations.

Source: ICAO Annex 15;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:InformationServicesProducts:AeronauticalInformationProduct:NOTAM

Associations:

Name Type
concerns Aerodrome
selected for the immediate attention of FlightCrewMember
has NOTAMCode
selected for entry in PreFlightInformationBulletin
issued by InternationalNOTAMOffice
is linked to specific Position
affects type of Flight
replaces NOTAM
has schedule Timesheet
cancels NOTAM
affects FlightInformationRegion
has area of influence Airspace
is identified by Integer
becomes effective at DateTime
is issued at DateTime
stops being effective at DateTime
is identified by Date


NOTAMCode

A comprehensive description of information contained in NOTAM.

Source: ICAO Doc 8400, 8th Ed;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:InformationServicesProducts:AeronauticalInformationProduct:NOTAMCode


NOTAMService

Provision of NOTAM service, as defined by ICAO Annex 15.

Source: EUROCONTROL-FAA AIXM v.5.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:AirTrafficServices:NOTAMService

Associations:

Name Type
publishes NOTAM


NoTransgressionZone

In the context of independent parallel approaches, a corridor of airspace of defined dimensions located centrally between the two extended runway centre lines, where a penetration by an aircraft requires a controller intervention to manoeuvre any threatened aircraft on the adjacent approach.

Source: ICAO Doc 4444;
Abbreviations: NTZ
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:Airspace:NoTransgressionZone

Associations:

Name Type
is located centrally between extended RunwayCentreLine


Obscuration

A weather phenomenon which reduces the visibility due to hydrometeor or lithometeor in suspension in the air.

Source: SESAR;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:Obscuration


ObservationReport

Information concerning the evaluation of one or more meteorological elements.

Source: SESAR;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:InformationServicesProducts:MeteorologicalInformationProduct:ObservationReport


Obstacle

All fixed (whether temporary or permanent) and mobile objects, or parts thereof, that: a) are located on an area intended for the surface movement of aircraft; or b) extend above a defined surface intended to protect aircraft in flight; or c) stand outside those defined surfaces and that have been assessed as being a hazard to air navigation.

Source: ICAO Annex 1; ICAO Annex 11; ICAO Annex 14; ICAO Annex 15; ICAO Annex 4;
Abbreviations: OBST
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:Obstacle:Obstacle


ObstacleArea

An area used for the purpose of collecting obstacle data, as necessary for air navigation systems or functions.

Source: EUROCONTROL-FAA AIXM v.5.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:Obstacle:ObstacleArea

Associations:

Name Type
used to assess for Obstacle


ObstacleAssessmentArea

The geometry of surfaces used to define the altitude the length of a segment, holding pattern, etc., in function of the obstructions located in the area.

Source: EUROCONTROL-FAA AIXM v.5.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:Obstacle:ObstacleAssessmentArea

Associations:

Name Type
is controlled by Obstacle
is established for AircraftCategory


ObstacleClearanceAltitude

The lowest altitude above the elevation of the relevant runway threshold or the aerodrome elevation as applicable, used in establishing compliance with appropriate obstacle clearance criteria.

Source: ICAO Annex 4; ICAO Annex 6;
Abbreviations: OCA
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:Obstacle:ObstacleClearanceAltitude


ObstacleClearanceHeight

The lowest height above the elevation of the relevant runway threshold or the aerodrome elevation as applicable, used in establishing compliance with appropriate obstacle clearance criteria.

Source: ICAO Annex 4; ICAO Annex 6;
Abbreviations: OCH
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:Obstacle:ObstacleClearanceHeight


ObstacleFreeZone

The airspace above the inner approach surface, inner transitional surfaces, and balked landing surface and that portion of the strip bounded by these surfaces, which is not penetrated by any fixed obstacle other than a low-mass and frangibly mounted one required for air navigation purposes.

Source: ICAO Annex 1; ICAO Annex 14; ICAO Annex 4;
Abbreviations: OFZ
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:Airspace:ObstacleFreeZone

Associations:

Name Type
not penetrated by Obstacle


ObstacleVisualAid

Marking and/or lighting intended to reduce hazards to aircraft by indicating the presence of obstacles.

Source: ICAO Annex 14, Vol. I, Fifth Edition;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:ObstacleVisualAid


Obstruction

The highest airspace, obstacle or terrain relative to a prescribed plane within a specified area.

Source: EUROCONTROL-FAA AIXM v.5.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:Obstacle:Obstruction

Associations:

Name Type
may be Terrain
may be Obstacle
may be Airspace


OffBlock

The departure of the aircraft from its parking position.

Source: EUROCONTROL ATM Lexicon;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:FlightEvent:OffBlock

Associations:

Name Type
qualifies DepartureSurfaceSegment
from AircraftStand


OffBlockReady

Event at which all doors of an aircraft are closed and departure will be possible immediately after reception of the ATC clearance.

Source: SESAR;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:FlightEvent:OffBlockReady

Associations:

Name Type
occurs at OffBlockReadyTime


OffBlockReadyTime

Time at which the aircraft is ready for Off-Block.

Source: SESAR;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:FlightEvent:OffBlockReadyTime


OffBlockTime

Time at which the aircraft departs from its parking position.

Source: SESAR;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:FlightEvent:OffBlockTime

Associations:

Name Type
is start of OffBlock


OffsetOfRoute

Instruction to fly a parallel track to the cleared route at a displacement of the specified distance in the specified direction.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:OffsetOfRoute


OFISMessage

A message integrating, for the purposes of broadcasting, meteorological information, information concerning radio navigation services and aerodromes.

Source: ICAO Annex 11;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:InformationServicesProducts:OFISMessage


Ohm

The electric resistance between two points of a conductor when a constant difference of potential of 1 volt, applied between these two points, produces in this conductor a current of 1 ampere, this conductor not being the source of any electromotive force.

Source: ICAO Annex 5;
Abbreviations: O
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Common:UnitsOfMeasure:Ohm


OperationalFlightInformationService

The automatic provision of integrated messages containing meteorological information, information concerning radio navigation services and aerodromes to aircraft in flight.

Source: SESAR;
Abbreviations: OFIS
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:AirTrafficServices:OperationalFlightInformationService

Associations:

Name Type
distributes OFISMessage


OperationalFlightPlan

The operator's plan for the safe conduct of the flight based on considerations of aeroplane performance, other operating limitations and relevant expected conditions on the route to be followed and at the aerodromes concerned.

Source: ICAO; ICAO Annex 3; ICAO Annex 6;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:AirspaceUserOperations:OperationalFlightPlan

Associations:

Name Type
is completed for commercial Flight


OperationsManual

A manual containing procedures, instructions and guidance for use by operational personnel in the execution of their duties.

Source: ICAO Annex 6;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:DocumentAndAgreement:OperationsManual

Associations:

Name Type
operationalizes OperationsSpecifications


OperationsSpecifications

The authorizations, conditions and limitations associated with the air operator certificate and subject to the conditions in the operations manual.

Source: ICAO Annex 6;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:DocumentAndAgreement:OperationsSpecifications

Associations:

Name Type
defines operations certified in AirOperatorCertificate


Operator

A person, organization or enterprise engaged in or offering to engage in an aircraft operation.

Source: ICAO Annex 3;
Synonyms: Aircraft Operator (Annex 9), Aircraft Operating Agency (Annex 10)
Abbreviations: OPR
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:Organisation:Operator

Associations:

Name Type
operates in State
legally based in StateOfTheOperator
designates FlightOperationsOfficerOrFlightDispatcher
designates PilotInCommand
consumes FlightInformationService
consumes AlertingService
consumes AirTrafficControlService
consumes AerodromeControlService


OperatorConfiguration

Aircraft configuration established by an aircraft operator for its fleet.

Source: SESAR;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Aircraft:OperatorConfiguration

Associations:

Name Type
is defined by Operator
constrains FlightConfiguration


OperatorConstraint

Operator procedures and other specific operator information that may impact manoeuvers and clearances which they are unable to accept from ATC.

Source: ICAO Doc 9965;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:AirspaceUserOperations:OperatorConstraint


OperatorFlightPriority

Indication of the relative priority of a flight within a group of flights for assignment of delays.

Source: ICAO Doc 9965;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:AirspaceUserOperations:OperatorFlightPriority

Associations:

Name Type
defined by AirspaceUser


OperatorPreferences

A particular wish related to the planned trajectory.

Source: SESAR;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:InformationServicesProducts:FlightInformationProduct:OperatorPreferences


OperatorsMaintenanceControlManual

A document which describes the operator's procedures necessary to ensure that all scheduled and unscheduled maintenance is performed on the operator's aircraft on time and in a controlled and satisfactory manner.

Source: ICAO Annex 6;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:DocumentAndAgreement:OperatorsMaintenanceControlManual


Organisation

A collection of people organized together into a community or other social, commercial or political structure. The group has some common purpose or reason for existence which goes beyond the set of people belonging to it, and can act as an agent.

Source: W3C Organization Ontology;
Synonyms: OrganizationAuthority
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:OrganisationRoleAndService:Organisation

Associations:

Name Type
is sub-organisation of Organisation
defines Role
owns Role
has site Location
issues Document
has ContactInformation
provides BusinessService
consumes BusinessService
defines Date


OrthometricHeight

Height of a point related to the geoid, generally presented as an MSL elevation.

Source: ICAO Annex 1; ICAO Annex 14; ICAO Annex 15; ICAO Annex 4;
Abbreviations: H
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Common:Geometry:OrthometricHeight

Associations:

Name Type
is generally presented as Elevation


OverPoint

The event of flying over a significant point.

Source: SESAR;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:FlightEvent:OverPoint

Associations:

Name Type
occurs at TimeOver
over SignificantPoint
at or above Altitude
at or below Altitude
between Altitude
at Altitude


Passenger

A person in or on a conveyance other than its driver, pilot, or crew.

Source: Oxford English Dictionary;
Abbreviations: PAX
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:Role:Passenger


PassengerAirService

An air service performed primarily for the transport of passengers.

Source: ICAO Doc 9626;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:PassengerAirService


PassengerLoadingBridge

A mechanically operated, adjustable ramp to provide direct passenger access between aircraft and buildings.

Source: ICAO Doc 9184/1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:PassengerLoadingBridge

Associations:

Name Type
serves AircraftStand


PassengerService

The availability of passenger amenities and facilities at or in the vicinity of an aerodrome.

Source: DGIWG;
Synonyms: Aerodrome Passenger Service
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:AirTrafficServices:PassengerService


PerformanceProfile

A zero-wind, standard atmosphere profile reflective of the flight capabilities and desired parameters.

Source: ICAO;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Aircraft:PerformanceProfile


Period

One-dimensional primitive representing an extent in time, a period is bounded by two different temporal positions.

Source: ISO 19108:2002;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Common:Temporal:Period

Associations:

Name Type
ends at Event
starts at Event


Person

A human being regarded as an individual.

Source: Oxford English Dictionary;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:OrganisationRoleAndService:Person


Pier

A platform extending from a shore over water and supported by piles or pillars, used to secure, protect, and provide access to ships, boats, and seaplanes.

Source: FAA (Federal Aviation Administration);
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:Pier


PilotControlledLighting

An indication that radio control of lighting is available to provide airborne control of lights by keying the aircraft's microphone.

Source: AIHWG;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:AirTrafficServices:PilotControlledLighting


PilotInCommand

The pilot designated by the operator, or in the case of general aviation, the owner, as being in command and charged with the safe conduct of a flight.

Source: ICAO Annex 1, Eleventh Edition;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:Role:PilotInCommand

Associations:

Name Type
is in charge of Flight
files AirFiledFlightPlan
must follow ATCInstruction
must follow after acceptance ATCClearance
approves and signs OperationalFlightPlan


PilotInCommandUnderSupervision

Co-pilot performing, under the supervision of the pilot-in-command, the duties and functions of a pilot-in-command, in accordance with a method of supervision acceptable to the Licensing Authority.

Source: ICAO Annex 1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:Role:PilotInCommandUnderSupervision


Point

The smallest unit of geometry which has no spatial extent. Points are described by two-dimensional (2D) or three-dimensional (3D) coordinates.

Source: ICAO Doc 9881;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Common:Geometry:Point

Associations:

Name Type
described by Position
described by Height
described by Altitude


PointInSpaceApproach

The point-in-space approach is based on a basic GNSS non-precision approach procedure designed for helicopters only. It is aligned with a reference point located to permit subsequent flight manoeuvring or approach and landing using visual manoeuvring in adequate visual conditions to see and avoid obstacles.

Source: ICAO Doc 8168, Vol. I, 5th Ed;
Abbreviations: PinS
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:RouteAndProcedure:PointInSpaceApproach


PointInSpaceReferencePoint

Reference point for the point-in-space approach as identified by the latitude and longitude of the MAPt.

Source: ICAO Doc 8168, Vol. I, 5th Ed;
Abbreviations: PRP
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:InfrastructurePoint:PointInSpaceReferencePoint


Polygon

A surface or area described by a closed line.

Source: ICAO Doc 9881;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Common:Geometry:Polygon

Associations:

Name Type
described by closed Line


Position

Set of coordinates (latitude and longitude) referenced to the mathematical reference ellipsoid which define the position of a point on the surface of the Earth.

Source: ICAO; ICAO Annex 1; ICAO Annex 15;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Common:Geometry:Position


PositionMarking

Location on the movement area surface used for Air Traffic Control clearances. Position marking could be a painted marking or a sign.

Source: EUROCAE ED 99D;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:PositionMarking

Associations:

Name Type
located on MovementArea
may be Marking
may be AerodromeSign


Precipitation

Hydrometeor consisting of a fall of an ensemble of particles. The forms of precipitation are: rain, drizzle, snow, snow grains, snow pellets, diamond dust, hail and ice pellets.

Source: WMO International Meteorological Vocabulary;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:Precipitation


PrecisionApproachProcedure

Precision approach (PA) procedure. An instrument approach procedure using precision lateral and vertical guidance with minima as determined by the category of operation.

Source: ICAO;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:RouteAndProcedure:PrecisionApproachProcedure

Associations:

Name Type
has DecisionHeight
has DecisionAltitude


PrecisionApproachRadar

Primary radar equipment used to determine the position of an aircraft during final approach, in terms of lateral and vertical deviations relative to a nominal approach path, and in range relative to touchdown.

Source: ICAO Doc 4444;
Abbreviations: PAR
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:SurveillanceInfrastructure:PrecisionApproachRadar

Associations:

Name Type
has limitation RadioFrequencyArea
uses Reflector


PrecisionApproachRadarSystem

A system comprising a precision approach radar and a surveillance radar element.

Source: ICAO Annex 10, Vol. I, Sixth Edition;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:SurveillanceInfrastructure:PrecisionApproachRadarSystem

Associations:

Name Type
comprises SurveillanceRadarElement
comprises PrecisionApproachRadar


PredictedAirspeed

The predicted indicated airspeed or Mach at the trajectory point.

Source: ICAO;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:Movement:PredictedAirspeed


PredictedGroundSpeed

The computed ground speed at the trajectory point.

Source: ICAO;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:Movement:PredictedGroundSpeed


PreFlightInformationBulletin

A presentation of current NOTAM information of operational significance, prepared prior to flight.

Source: ICAO Annex 15;
Abbreviations: PIB
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:InformationServicesProducts:AeronauticalInformationProduct:PreFlightInformationBulletin


PreliminaryFlightPlan

A flight plan provided by the operator to obtain the FF-ICE Planning service.

Source: ICAO;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:InformationServicesProducts:FlightInformationProduct:PreliminaryFlightPlan

Associations:

Name Type
is early FlightPlan


PrescribedEETReportingPoint

A point that has been prescribed for required Estimated Elapsed Time reporting.

Source: ICAO;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:Movement:PrescribedEETReportingPoint


PreTacticalOperationalPlanning

ATM activities aiming to accommodate demand, once initial schedules have been provided and permissions have been obtained.

Source: ICAO Doc 9965;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:PreTacticalOperationalPlanning

Associations:

Name Type
is followed by TacticalOperationalPlanning


PrimarySurveillanceRadar

A surveillance radar system which uses reflected radio signals.

Source: ICAO Doc 4444;
Abbreviations: PSR
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:SurveillanceInfrastructure:PrimarySurveillanceRadar


ProcedureTransition

A group of consecutive segments that are part of a branch on an approach procedure, SID or STAR.

Source: EUROCONTROL-FAA AIXM v.5.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:RouteAndProcedure:ProcedureTransition

Associations:

Name Type
is expressed as SegmentLeg


ProceedDirectToPosition

Instruction to proceed directly from its present position to the specified position.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:ProceedDirectToPosition


ProhibitedArea

An airspace of defined dimensions, above the land areas or territorial waters of a State, within which the flight of aircraft is prohibited.

Source: ICAO Annex 1; ICAO Annex 15; ICAO Annex 2; ICAO Annex 4;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:Airspace:ProhibitedArea


ProtectedAirspace

Airspace protected from specific air traffic.

Source: EUROCONTROL-FAA AIXM v.5.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:Airspace:ProtectedAirspace


PublicAuthority

The agency or officials of a Contracting State responsible for the application and enforcement of the particular laws and regulations of that State which relate to any aspect of these Standards and Recommended Practices.

Source: ICAO Annex 9;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:Organisation:PublicAuthority


RadioactiveCloud

A radioactive particulate contaminated atmospheric area.

Source: EUROCONTROL-FAA WXXM v.1.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:RadioactiveCloud


RadioAltimeterOperatingArea

A flat area established in the pre-threshold area of a precision approach runway to accommodate aeroplanes making auto-coupled approaches and automatic landings.

Source: ICAO Annex 14, Vol. I, Fifth Edition;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:RadioAltimeterOperatingArea


RadioCommunicationChannel

A radio frequency band of sufficient width and associated identification data used for one- or two-way communication from or to a transmitter on the ground or in the air.

Source: EUROCONTROL-FAA AIXM v.5.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:AirTrafficServices:RadioCommunicationChannel


RadioCommunicationFailureMessage

Message transmitted when an ATS Unit is aware that an aircraft in its area is experiencing radio communications failure. Message transmitted to all subsequent ATS Units that have already received basic flight plan data and to the aerodrome control tower at the destination aerodrome, if basic flight plan data has been previously sent. If the next ATS Unit would receive flight plan information by current flight plan, the current flight plan and this message can be send and forwarded downstream.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:InformationServicesProducts:FlightInformationProduct:RadioCommunicationFailureMessage


RadioFrequencyArea

A limitation, such as coverage, usability, etc., of a radio navigation aid or service frequency.

Source: EUROCONTROL-FAA AIXM v.5.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:SurveillanceInfrastructure:RadioFrequencyArea


RadioNavigationAid

Any electronic system which provides information to be used by the pilot or aircraft navigation systems for position determination or flight path guidance.

Source: ICAO Doc 9294;
Synonyms: RadioNavaidEquipment
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:NavigationInfrastructure:RadioNavigationAid

Associations:

Name Type
has limitation RadioFrequencyArea
installed at TouchDownLiftOff
installed at RunwayDirection
may be implemented at Heliport
may be implemented at Aerodrome
supports navigation through Airspace


RadioNavigationService

A service providing guidance information or position data for the efficient and safe operation of aircraft supported by one or more radio navigation aids.

Source: ICAO;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:NavigationInfrastructure:RadioNavigationService

Associations:

Name Type
supported by NavigationAidInfrastructure


RadiotelephonyNetwork

A group of radiotelephony aeronautical stations which operate on and guard frequencies from the same family and which support each other in a defined manner to ensure maximum dependability of air-ground communications and dissemination of air-ground traffic.

Source: ICAO Annex 10, Vol. II, Sixth Edition;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:CommunicationInfrastructure:RadiotelephonyNetwork


Rain

Precipitation of liquid water particles, either in the form of drops of more than 0.5 mm in diameter, or of smaller widely scattered drops.

Source: WMO International Meteorological Vocabulary;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:Rain


Ranked4DTrajectories

A series of desired 4D trajectories, with tolerances supplied if necessary by the airspace user to define when the next ranked trajectory should be used.

Source: ICAO Doc 9965;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:Ranked4DTrajectories

Associations:

Name Type
is series with tolerances Ranked4DTrajectory


Ranked4DTrajectory

A 4D trajectory proposed by airspace user or ASP as a potential agreed 4D trajectory.

Source: FIXM v3.0;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:Ranked4DTrajectory

Associations:

Name Type
represents an additional Airspace User request during TrajectorySynchronisation


RapidExitTaxiway

A taxiway connected to a runway at an acute angle and designed to allow landing aeroplanes to turn off at higher speeds than are achieved on other exit taxiways thereby minimizing runway occupancy times.

Source: ICAO Annex 14;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:RapidExitTaxiway


RatedAirTrafficController

An air traffic controller holding a licence and valid ratings appropriate to the privileges to be exercised.

Source: ICAO Annex 1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:Agent:RatedAirTrafficController

Associations:

Name Type
in controlled airspace executes Separator
implements AirTrafficControlService
receives CurrentFlightPlan


ReachLevelByPosition

Instruction that a change of level is to continue, but at a rate such that the specified level is reached at or before the specified position.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:ReachLevelByPosition


ReceivingUnitOrController

Air traffic services unit/air traffic controller to which a message is sent.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:Role:ReceivingUnitOrController


ReducedCoordinationArea

Portion of airspace of defined dimensions within which general aviation traffic is permitted "off-route" without requiring general aviation traffic controllers to initiate co-ordination with OAT controllers.

Source: EUROCONTROL-FAA AIXM v.5.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:Airspace:ReducedCoordinationArea


ReduceSpeedToSpeed

Instruction that the present speed is to be reduced to the specified speed and maintained until further advised.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:ReduceSpeedToSpeed


ReduceSpeedToSpeedOrLess

Instruction that the present speed is to be reduced to the specified speed, or less, and maintained at or below the specified speed until further advised.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:ReduceSpeedToSpeedOrLess


ReduceToMinimumApproachSpeed

Instruction to reduce present speed to the minimum safe approach speed.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:ReduceToMinimumApproachSpeed


Reflector

A reflector used with a precision approach radar.

Source: EUROCONTROL-FAA AIXM v.5.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:SurveillanceInfrastructure:Reflector


RegionalAirNavigationAgreement

Agreement approved by the Council of ICAO normally on the advice of a regional air navigation meeting.

Source: ICAO Annex 3;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:DocumentAndAgreement:RegionalAirNavigationAgreement

Associations:

Name Type
establishes AirTrafficFlowManagement


RegionalAirService

An air service offered on routes serving smaller cities within a region or between regions of a State; or an air service offered on secondary routes serving smaller cities in a regional area involving the territories of more than one State.

Source: ICAO Doc 9626;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:RegionalAirService


RegionalSpecializedMeteorologicalCentre

A specialized meteorological centre for the provision of transport model products for radiological environmental emergency response, at the request of the delegated authority of the State in which the radioactive material was released into the atmosphere, or the International Atomic Energy Agency (IAEA).

Source: ICAO; ICAO Annex 3;
Abbreviations: RSMC
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:Organisation:RegionalSpecializedMeteorologicalCentre


RegularStation

A station selected from those forming an en-route air-ground radiotelephony network to communicate with or to intercept communications from aircraft in normal conditions.

Source: ICAO Annex 10, Vol. II, Sixth Edition;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:CommunicationInfrastructure:RegularStation


RegulatedAgent

An agent, freight forwarder or any other entity who conducts business with an operator and provides security controls that are accepted or required by the appropriate authority in respect of cargo or mail.

Source: ICAO Annex 1; ICAO Annex 17;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:Agent:RegulatedAgent


RejectedTakeOffDistanceAvailableForHelicopter

The length of the FATO declared available and suitable for helicopters operated in performance class 1 to complete a rejected take-off.

Source: ICAO Annex 14;
Abbreviations: RTODAH
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:RejectedTakeOffDistanceAvailableForHelicopter


RejoinRouteByPosition

Instruction that the cleared flight route is to be rejoined at or before the specified time.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:RejoinRouteByPosition


RejoinRouteByTime

Instruction that the cleared flight route is to be rejoined at or before the specified time.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:RejoinRouteByTime


ReliefFlight

Flight operated for humanitarian purposes which carried relief personnel and relief supplies such as food, clothing, shelter, medical and other items during or after an emergency and/or disaster and/or is used to evacuate persons from a place where their life or health is threatened by such emergency and/or disaster to a safe haven in the same State or another State willing to receive such persons.

Source: ICAO Annex 9;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:ReliefFlight


RepetitiveFlightPlan

A flight plan related to a series of frequently recurring, regularly operated individual flights with identical basic features, submitted by an operator for retention and repetitive use by ATS units.

Source: ICAO; ICAO Annex 2;
Abbreviations: RPL
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:InformationServicesProducts:FlightInformationProduct:RepetitiveFlightPlan

Associations:

Name Type
instantiates FlightPlan


ReportingPoint

A specified (named) geographical location in relation to which the position of an aircraft can be reported.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:InfrastructurePoint:ReportingPoint


RequiredCommunicationPerformance

A statement of the performance requirements for operational communication in support of specific ATM functions.

Source: ICAO;
Abbreviations: RCP
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:CommunicationInfrastructure:RequiredCommunicationPerformance


RequiredNavigationPerformance

A statement of the navigation performance necessary for operation within a defined airspace.

Source: ICAO Doc 4444;
Abbreviations: RNP
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:Airspace:RequiredNavigationPerformance

Associations:

Name Type
is navigation performance necessary for operation within Airspace


RescueCoordinationCentre

A unit responsible for promoting efficient organization of search and rescue services and for coordinating the conduct of search and rescue operations within a search and rescue region.

Source: ICAO Annex 11;
Abbreviations: RCC
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:Organisation:RescueCoordinationCentre

Associations:

Name Type
keeps informed Operator
organises SearchAndRescueService
consumes AlertingService
receives AlertMessage
considers flight to be in EmergencyPhase


Resolution

A number of units or digits to which a measured or calculated value is expressed and used.

Source: ICAO Annex 1; ICAO Annex 15; ICAO Annex 4;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:InformationServicesProducts:AeronauticalInformationProduct:Resolution


RestrictedArea

An airspace of defined dimensions, above the land areas or territorial waters of a State, within which the flight of aircraft is restricted in accordance with certain specified conditions.

Source: ICAO Annex 1; ICAO Annex 15; ICAO Annex 2; ICAO Annex 4;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:Airspace:RestrictedArea


RestrictedUseAreaVisualAid

Marking and/or lighting intended to indicate runways and taxiways, or areas in their vicinity where restrictions of use apply.

Source: ICAO Annex 14, Vol. I, Fifth Edition;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:RestrictedUseAreaVisualAid


ResumeNormalSpeed

Instruction that the aircraft's normal speed be resumed. The previously issued speed restriction(s) are cancelled.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:ResumeNormalSpeed


Road

An established surface route on the movement area meant for the exclusive use of vehicles.

Source: ICAO; ICAO Annex 1; ICAO Annex 14;
Synonyms: Aerodrome Service Road
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:Road

Associations:

Name Type
part of MovementArea
gives access to AircraftStand


Role

The role of an agent in an Organization. This describes the abstract role, any specific instance is modeled using "membership".

Notice that the notion of "role" combines the concepts of an agent "holding" the role and an organization "defining" and legally "owning" it.

Source: W3C Organization Ontology;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:OrganisationRoleAndService:Role

Associations:

Name Type
operationally interacts with Role


RouteLayout

The way in which the parts of a route are arranged.

Source: Oxford English Dictionary;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:RouteAndProcedure:RouteLayout

Associations:

Name Type
is series of RoutePortion
is series of RouteSegment
is series of SegmentPoint


RoutePoint

A specified geographical location used in defining a flight route.

Source:
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:Movement:RoutePoint

Associations:

Name Type
may coincide with TrajectoryPoint
may coincide with InfrastructurePoint


RoutePortion

A group of two or more consecutive segments of the same route, which have the usage and/or the same flight restrictions.

Source: EUROCONTROL-FAA AIXM v.5.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:RouteAndProcedure:RoutePortion

Associations:

Name Type
groups RouteSegment
for DME/DME navigation, uses DME


RouteSegment

A route or portion of route usually flown without an intermediate stop.

Source: ICAO; ICAO Annex 1; ICAO Annex 10;
Synonyms: Air Traffic Service (ATS) Route Segment
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:RouteAndProcedure:RouteSegment

Associations:

Name Type
has Geometry
ends at SegmentPoint
starts at SegmentPoint


RulesProcedures

An instruction or regulation that needs to be considered by personnel involved in flight operations in relation with an aerodrome or an airspace.

Source: EUROCONTROL-FAA AIXM v.5.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:InformationServicesProducts:AeronauticalInformationProduct:RulesProcedures

Associations:

Name Type
concerns Aerodrome
concerns Heliport
concerns Airspace


Runway

A defined rectangular area on a land aerodrome prepared for the landing and take-off of aircraft.

Source: ICAO; ICAO Annex 1; ICAO Annex 14;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:Runway

Associations:

Name Type
connects to Taxiway
has RunwayDirection
part of ManoeuvringArea
situated at Aerodrome


RunwayBlastPad

Specially prepared surface placed adjacent to the end of a runway to eliminate the erosive effect of the high wind forces produced by airplanes at the beginning of their take-off rolls.

Source: EUROCONTROL-FAA AIXM v.5.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:RunwayBlastPad

Associations:

Name Type
at RunwayDirection


RunwayCapacity

The number of aircraft movements which aeronautical authorities determine can safely be operated, usually stated as the total number of landings and take-offs per hour, taking into account such factors as the physical characteristics of the runways and the surrounding area, altitude, the types of aircraft involved (larger aircraft may mandate greater separation) and air traffic control (approach and aerodrome control) capabilities.

Source: ICAO Doc 9626;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:AerodromeOperations:RunwayCapacity

Associations:

Name Type
may be defined for Runway
may be defined for RunwayDirection


RunwayCentreLine

A theoretical line parallel to the direction of the runway partitioning into two equal parts. This line is materialised by marking and a runway centreline light system which can be extended beyond the runway threshold in order to guide landing aircraft to the runway.

Source: SESAR;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:RunwayCentreLine

Associations:

Name Type
is defined for Runway


RunwayCentrelinePoint

An operationally significant position on the centre line of a runway direction.

Source: EUROCONTROL-FAA AIXM v.5.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:RunwayCentrelinePoint

Associations:

Name Type
identifies RunwayDeclaredDistance
defined for RunwayDirection
is defined on RunwayCentreLine


RunwayCrossingClearance

The clearance required to cross or operate on any active/inactive or closed runway.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:RunwayCrossingClearance


RunwayDeclaredDistance

A conventional operational distance declared for a runway direction.

Source: EUROCONTROL-FAA AIXM v.5.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:RunwayDeclaredDistance


RunwayDirection

One of the two possible landing and/or take-off directions of a runway or Final Approach and Take-off Area (FATO).

Source: DGIWG;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:RunwayDirection

Associations:

Name Type
has dependent RunwayDirection


RunwayEndSafetyArea

An area symmetrical about the extended runway centre line and adjacent to the end of the strip primarily intended to reduce the risk of damage to an aeroplane undershooting or overrunning the runway.

Source: ICAO Annex 14;
Abbreviations: RESA
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:RunwayEndSafetyArea

Associations:

Name Type
is adjacent to the end of RunwayStrip
is symmetrical about the extended RunwayCentreLine


RunwayHoldingPosition

A designated position intended to protect a runway, an obstacle limitation surface, or an ILS/MLS critical/sensitive area at which taxiing aircraft and vehicles shall stop and hold, unless otherwise authorized by the aerodrome control tower.

Source: ICAO Annex 1; ICAO Annex 14; ICAO Annex 2; ICAO Annex 4;
Synonyms: Holding Point
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:RunwayHoldingPosition

Associations:

Name Type
protects Runway


RunwayProtectionArea

An area situated in the vicinity of a runway or provided to protect aircraft during manoeuvring, take-off and landing operations.

Source: EUROCONTROL-FAA AIXM v.5.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:RunwayProtectionArea


RunwaySafetyArea

A defined surface surrounding the runway prepared or suitable for reducing the risk of damage to airplanes in the event of an undershoot, overshoot, or excursion from the runway.

Source: FAA (Federal Aviation Administration);
Abbreviations: RSA
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:RunwaySafetyArea

Associations:

Name Type
includes RunwayStrip
is centered on RunwayCentreLine


RunwayShoulder

An area adjacent to the edge of a runway so prepared as to provide a transition between the runway and the adjacent surface.

Source: ICAO Annex 14;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:RunwayShoulder

Associations:

Name Type
adjacent to Runway


RunwayStrip

A defined area including the runway and stopway, if provided, intended: a) to reduce the risk of damage to aircraft running off a runway; and b) to protect aircraft flying over it during take-off or landing operations.

Source: ICAO Annex 1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:RunwayStrip

Associations:

Name Type
includes Stopway
includes Runway


RunwayTurnPad

A defined area on a land aerodrome adjacent to a runway for the purpose of completing a 180-degree turn on a runway.

Source: ICAO Annex 14;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:RunwayTurnPad

Associations:

Name Type
adjacent to Runway


RunwayVisualRange

The range over which the pilot of an aircraft on the centre line of a runway can see the runway surface markings or the lights delineating the runway or identifying its centre line.

Source: ICAO Annex 3;
Abbreviations: RVR
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:RunwayVisualRange

Associations:

Name Type
is provided by RunwayVisualRangeSystem


RunwayVisualRangeSystem

A meteorological equipment providing information about the distance over which the pilot of an aircraft on the centre line of a runway can see the runway surface markings or the lights delineating the runway or identifying its centre line.

Source: EUROCONTROL-FAA AIXM v.5.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:RunwayVisualRangeSystem

Associations:

Name Type
provides RVR for RunwayDirection


SafetyArea

A defined area on a heliport surrounding the FATO which is free of obstacles, other than those required for air navigation purposes, and intended to reduce the risk of damage to helicopters accidentally diverging from the FATO.

Source: ICAO Annex 1; ICAO Annex 14;
Synonyms: FATO Safety Area
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:SafetyArea

Associations:

Name Type
on Heliport
surrounds FinalApproachAndTakeOffArea


SafetySensitivePersonnel

Persons who might endanger aviation safety if they perform their duties and functions improperly including, but not limited to, crew members, aircraft maintenance personnel and air traffic controllers.

Source: ICAO Annex 2;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:Agent:SafetySensitivePersonnel


Sand

A material consisting of comminuted fragments and water-worn particles of rocks (mainly silicious) finer than those of which gravel is composed.

Source: Oxford English Dictionary;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:Sand


SandStorm

An ensemble of particles of sand energetically lifted to great heights by a strong and turbulent wind.

Source: WMO International Meteorological Vocabulary;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:SandStorm


SatelliteWeatherObservingSystem

Weather satellites transmit visible imagery for daytime observing, infrared photos for both day and night observing and water vapor imagery that identify locations of moist and dry air (important for thunderstorm forecasting). Satellite imagery and data are also detection sources of convection, volcanic ash, ceiling, and fog products used in flight planning.

Source: FAA (Federal Aviation Administration);
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:SatelliteWeatherObservingSystem


ScheduledAirService

An air service open to use by the general public and operated according to a published timetable or with such a regular frequency that it constitutes an easily recognizable systematic series of flights.

Source: ICAO ADREP 2000;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:ScheduledAirService


ScheduledInternationalAirService

A series of flights that possesses all of the following characteristics: - it passes through the airspace over the territory of more than one State; - it is performed by aircraft for the transport of passengers, mail or cargo for remuneration, in such a manner that each flight is open to use by members of the public; and - it is operated so as to serve traffic between the same two or more points, either according to a published timetable or with flights so regular or frequent that they constitute a recognizable systematic series.

Source: ICAO Doc 9626;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:ScheduledInternationalAirService


SchedulingAndStrategicActivities

ATM activities whereby airspace users perform mission planning, aerodrome operators plan to ensure the demand does not exceed available surface resources and ATM service providers determine if reallocation of resources to better meet the demand and if changes to airspace organization are required to optimize the allocation of resources.

Source: ICAO Doc 9965;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:SchedulingAndStrategicActivities

Associations:

Name Type
is followed by PreTacticalOperationalPlanning


SeaplaneLandingArea

A defined area on water at an aerodrome prescribed for the landing and take-off of seaplanes.

Source: ICAO;
Synonyms: Seaplane Run
Abbreviations: SLA
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:SeaplaneLandingArea

Associations:

Name Type
uses TaxiChannel
has SeaplaneRampSite
take-off and landing is from WaterLaneEnd
utilizes TurningBasin
marked by MarkingBuoy
has FloatingDockSite
uses DockingArea
includes seaplane AnchorageArea


SeaplaneRampCentreline

The centerline of ramps specifically designed to transit seaplanes to or from land or water.

Source: FAA (Federal Aviation Administration);
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:SeaplaneRampCentreline


SeaplaneRampSite

Ramps specifically designed to transit seaplanes from land to water and vice versa.

Source: EUROCONTROL-FAA AIXM v.5.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:SeaplaneRampSite

Associations:

Name Type
guidance is provided by SeaplaneRampCentreline


SearchAndRescueService

The performance of distress monitoring, communication, coordination and search and rescue functions, initial medical assistance or medical evacuation, through the use of public and private resources, including cooperating aircraft, vessels and other craft and installations.

Source: ICAO Annex 12;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:SearchAndRescueService


SearchAndRescueService

The performance of distress monitoring, communication, coordination and search and rescue functions, initial medical assistance or medical evacuation, through the use of public and private resources, including cooperating aircraft, vessels and other craft and installations.

Source: ICAO; ICAO Annex 1; ICAO Annex 12;
Synonyms: Search Rescue Service, CodeServiceSARType.SAR
Abbreviations: SAR
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:AirTrafficServices:SearchAndRescueService


SecondarySurveillanceRadar

A surveillance radar system which uses transmitters/receivers (interrogators) and transponders.

Source: ICAO Annex 1; ICAO Annex 10;
Synonyms: CodeRadarServiceType.SSR
Abbreviations: SSR
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:SurveillanceInfrastructure:SecondarySurveillanceRadar

Associations:

Name Type
has limitation RadioFrequencyArea


SegmentedCircleAirportMarkerSystem

A minimum installation consisting of a segmented circle located off the traffic area with a conventional wind cone located at its center, which may be supplemented with other pilot aids and traffic control devices required to meet the conditions existing at a particular airport.

Source: FAA (Federal Aviation Administration);
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:SegmentedCircleAirportMarkerSystem

Associations:

Name Type
aids the pilot in locating Aerodrome
provides a centralized location for such indicators and signal devices as may be required on Aerodrome


SegmentLeg

A part of an instrument or visual flight procedure defined by two consecutive significant points.

Source: Aeronautical Information Feature Data Dictionary (AIFDD);
Synonyms: Procedure Segment Leg
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:RouteAndProcedure:SegmentLeg

Associations:

Name Type
uses RadioNavigationAid
for DME/DME navigation, uses DME
ends at SegmentPoint
is based on SegmentPoint
starts at SegmentPoint
uses as arc centre SegmentPoint
is established for AircraftCategory
is established for AircraftCapability


SegmentPoint

A point associated with a defined segment.

Source: EUROCONTROL-FAA AIXM v.5.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:InfrastructurePoint:SegmentPoint


SendingUnitOrController

Air traffic services unit/air traffic controller transmitting a message.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:Role:SendingUnitOrController


SeparationMinima

The minimum displacements between an aircraft and a hazard which maintain the risk of collision at an acceptable level of safety.

Source: ICAO Doc 9854;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ConflictManagement:SeparationMinima

Associations:

Name Type
are associated with SeparationMode


SeparationMode

An approved set of rules, procedures and conditions of application associated with separation minima.

Source: ICAO Doc 9854;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ConflictManagement:SeparationMode


SeparationProvision

The tactical process of keeping aircraft away from hazards by at least the appropriate separation minima.

Source: ICAO Doc 9854;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ConflictManagement:SeparationProvision

Associations:

Name Type
is achieved by maintaining SeparationMinima
keeps aircraft away from Hazard


Separator

The agent responsible for separation provision for a conflict, being either the airspace user or a separation provision service provider.

Source: ICAO Doc 9854;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:Role:Separator

Associations:

Name Type
is responsible for SeparationProvision
selects to resolve conflict SeparationMode
ensures SeparationMinima
detects Conflict
issues ATCInstruction
issues ATCClearance


ServiceProviderCallsign

Information about the operational identifier by which the provider of the service is called and the language used.

Source: EUROCONTROL-FAA AIXM v.5.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:AirTrafficServices:ServiceProviderCallsign


ShipboardHeliport

A heliport located on a ship that may be purpose or non-purpose-built. A purpose-built shipboard heliport is one designed specifically for helicopter operations. A non-purpose-built shipboard heliport is one that utilizes an area of the ship that is capable of supporting a helicopter but not designed specifically for that task.

Source: ICAO Annex 1; ICAO Annex 14;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:ShipboardHeliport


Shoulder

An area adjacent to the edge of a pavement so prepared as to provide a transition between the pavement and the adjacent surface.

Source: ICAO Annex 1; ICAO Annex 14; ICAO Annex 4;
Synonyms: Movement Area Shoulder
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:Shoulder


Siemens

The electric conductance of a conductor in which a current of 1 ampere is produced by an electric potential difference of 1 volt.

Source: ICAO Annex 5;
Abbreviations: S
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Common:UnitsOfMeasure:Siemens


Sievert

The unit of radiation dose equivalent corresponding to 1 joule per kilogram.

Source: ICAO Annex 5;
Abbreviations: Sv
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Common:UnitsOfMeasure:Sievert


SIGMET

Information issued by a meteorological watch office concerning the occurrence or expected occurrence of specified en-route weather phenomena which may affect the safety of aircraft operations.

Source: ICAO; ICAO Annex 3;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:InformationServicesProducts:MeteorologicalInformationProduct:SIGMET


SignificantPoint

A specified geographical location used in defining an ATS route or the flight path of an aircraft and for other navigation and ATS purposes.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Common:Geometry:SignificantPoint

Associations:

Name Type
is a Point
may have position expressed as Intersection


SimplifiedDirectionalFacility

A radio navigation aid providing a final approach course similar to, but less precise than, that of the ILS localizer.

Source: EUROCONTROL-FAA AIXM v.5.1;
Abbreviations: SDF
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:NavigationInfrastructure:SimplifiedDirectionalFacility


SlotSwapping

A tactical ATFM measure aiming at swapping departure slots that can be applied either manually or via automated means.

Source: ICAO Doc 9971;
Synonyms: ATFMSlotSwap
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:DemandAndCapacityBalancing:SlotSwapping

Associations:

Name Type
reduces delay of Flight
increases delay of Flight


SmallHail

Precipitation of translucent ice particles, which falls from a cloud. These particles are almost always spherical and sometimes have conical tips. Their diameter may attain or even exceed five millimetres.

Source: WMO International Meteorological Vocabulary;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:SmallHail


Smoke

Suspension in the atmosphere of small particles produced by combustion.

Source: WMO International Meteorological Vocabulary;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:Smoke


Snow

Precipitation of ice crystals, isolated or agglomerated, falling from a cloud.

Source: WMO International Meteorological Vocabulary;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:Snow


SnowGrains

Precipitation of very small opaque white particles of ice which fall from a cloud and which are fairly flat or elongated with diameters generally less than 1 mm.

Source: WMO International Meteorological Vocabulary;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:SnowGrains


SnowPellets

Precipitation of white and opaque ice particles, which fall from a cloud and which are generally conical or rounded, with diameters attaining as much as 5 mm.

Source: WMO International Meteorological Vocabulary;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:SnowPellets


SNOWTAM

A special series NOTAM notifying the presence or removal of hazardous conditions due to snow, ice, slush or standing water associated with snow, slush and ice on the movement area, by means of a specific format.

Source: ICAO Annex 15;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:InformationServicesProducts:AeronauticalInformationProduct:SNOWTAM


SNOWTAMService

SNOWTAM service.

Source: EUROCONTROL-FAA AIXM v.5.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:AirTrafficServices:SNOWTAMService

Associations:

Name Type
publishes SNOWTAM


SolarFlare

Bright eruption from the Sun's chromosphere. Solar flares are classified in terms of the area of chromosphere affected, the duration of the phenomenon, and the width of the Ha line of hydrogen, on a scale ranging from 1- (minor eruption) to 3+ (very large eruption).

Source: WMO International Meteorological Vocabulary;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:SolarFlare


SolarRadiation

Electromagnetic radiation emitted by the Sun with a spectrum close to the one of a black body with a temperature of 5770 K. The radiation peaks in visible wavelengths. When compared to the terrestrial radiation it is often referred to as shortwave radiation.

Source: WMO;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:SolarRadiation


SpaceWeather

The physical and phenomenological state of the natural space environment, including the Sun and the interplanetary and planetary environments.

Source: WMO;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:SpaceWeather


SpecialHandling

Special consideration given to the flight by ATS units.

Source: SESAR;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:SpecialHandling

Associations:

Name Type
given by AirTrafficServicesUnit


SpecialRadioNavaid

Wide area (worldwide) navigation systems based on a chain of land or maritime stations providing radio frequency signals which can be used by airborne equipment to determine at least, the mobile two-dimensional position.

Source: EUROCONTROL-FAA AIXM v.5.1;
Synonyms: Special Navigation System
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:NavigationInfrastructure:SpecialRadioNavaid


SpecialRequirementsFlight

A flight that is expected to be operating in accordance with regulations issued by the relevant State for aircraft operating as State aircraft, as per Article 3 of the Convention on International Civil Aviation (Doc 7300), and for aircraft operating in accordance with State regulations for non-standard flying activities, normally through the use of reserved airspace.

Source: ICAO Doc 9965;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:SpecialRequirementsFlight


SpecialVFRFlight

A VFR flight cleared by air traffic control to operate within a control zone in meteorological conditions below VMC.

Source: ICAO Annex 2;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:SpecialVFRFlight


SpeedChange

A change in speed during the execution of the flight.

Source:
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:FlightEvent:SpeedChange


SpeedConstraint

A restriction brought to the speed component of the trajectory of an aircraft.

Source: SESAR;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:Movement:SpeedConstraint

Associations:

Name Type
requires SpeedChange
requires OverPoint
requires FlightRulesChange


SpeedSchedule

A climb and a descent speed schedule comprised of a target Indicated Airspeed and Mach representing speed targets for the flight in transition assuming no flight-specific constraints.

Source: ICAO;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Aircraft:SpeedSchedule


Spray

Ensemble of water droplets torn by the wind from the surface of an extensive body of water, generally from the wave crests, and carried up a short distance into the air.

Source: WMO International Meteorological Vocabulary;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:Spray


Squall

Atmospheric phenomenon characterized by an abrupt and large increase of wind speed with a duration of the order of minutes which diminishes rather suddenly. It is often accompanied by showers or thunderstorms.

Source: WMO International Meteorological Vocabulary;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:Squall


SSRCode

The number assigned to a particular multiple pulse reply signal transmitted by a transponder in Mode A or Mode C.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:FlightIdentifier:SSRCode

Associations:

Name Type
used by SecondarySurveillanceRadar
in Mode S, corresponds to AircraftAddress
is assigned to Aircraft


StandardInstrumentArrival

A designated instrument flight rule (IFR) arrival route linking a significant point, normally on an ATS route, with a point from which a published instrument approach procedure can be commenced.

Source: ICAO Doc 4444;
Abbreviations: STAR
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:RouteAndProcedure:StandardInstrumentArrival

Associations:

Name Type
connects to InstrumentApproachProcedure


StandardInstrumentDeparture

A designated instrument flight rule (IFR) departure route linking the aerodrome or a specified runway of the aerodrome with a specified significant point, normally on a designated ATS route, at which the en-route phase of a flight commences.

Source: ICAO Doc 4444;
Abbreviations: SID
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:RouteAndProcedure:StandardInstrumentDeparture

Associations:

Name Type
connects to ATSRoute


StandardLevelColumn

A column of consecutive cruising levels within a standard level table.

Source: EUROCONTROL-FAA AIXM v.5.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:InformationServicesProducts:AeronauticalInformationProduct:StandardLevelColumn


StandardLevelSector

The general rule by which standard level columns are used in a national airspace or within a region.

Source: EUROCONTROL-FAA AIXM v.5.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:Airspace:StandardLevelSector

Associations:

Name Type
applies StandardLevelColumn
applies to Airspace


StandardLevelTable

A table of consecutive cruising levels described under vertical separation criteria limited by an upper and lower level and used by General Air Traffic.

Source: EUROCONTROL-FAA AIXM v.5.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:InformationServicesProducts:AeronauticalInformationProduct:StandardLevelTable

Associations:

Name Type
contains StandardLevelColumn


StandingPhase

The phase of flight from the time the first person boards the aircraft with the intention of flight until push-back or, if pushback does not apply, until taxiing from the gate or parking position is commenced. Subsequently, from engine shut down upon reaching the gate or parking position after flight until the last person has exited the aircraft.

Source: ICAO ADREP 2000;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:FlightPhase:StandingPhase

Associations:

Name Type
includes StartUp


StartOfExpectVectors

The start of the vectoring, when procedures specify "Expect Vectors".

Source: ICAO;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:FlightEvent:StartOfExpectVectors


StartOfTakeOffRoll

The start of takeoff roll.

Source: ICAO;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:FlightEvent:StartOfTakeOffRoll


StartUp

The start up of the aircraft engines by the flight crew upon the ATC approval.

Source: SESAR;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:FlightEvent:StartUp

Associations:

Name Type
qualifies DepartureSurfaceSegment
begins upon StartUpClearance


StartUpApprovalTime

Time at which the Start-Up of the aircraft engines is approved.

Source: SESAR;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:StartUpApprovalTime


StartUpClearance

Approval from air traffic control to proceed with the Start-Up.

Source: SESAR;
Synonyms: Start-up Approval
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:StartUpClearance

Associations:

Name Type
cannot start before OffBlockReady
followed by OffBlock
approved at StartUpApprovalTime


State

An internationally recognized geographic entity that provides air traffic service.

Source: ICAO Doc 9881;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:Organisation:State

Associations:

Name Type
established by PublicAuthority
designates MeteorologicalAuthority
designates LicensingAuthority
designates AppropriateATSAuthority
has accepted responsibility for international Airspace
has jurisdiction over Airspace
has received delegation of responsibility for Airspace


StateFlight

Operation of an aircraft used in military, customs or police service.

Source: ICAO ADREP 2000;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:StateFlight


StateOfDesign

The State having jurisdiction over the organization responsible for the type design.

Source: ICAO Annex 1; ICAO Annex 13; ICAO Annex 8;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:Organisation:StateOfDesign


StateOfManufacture

The State having jurisdiction over the organization responsible for the final assembly of the aircraft.

Source: ICAO Annex 1; ICAO Annex 13; ICAO Annex 8;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:Organisation:StateOfManufacture


StateOfOccurrence

The State in the territory of which an accident or incident occurs.

Source: ICAO; ICAO Annex 1; ICAO Annex 13;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:Organisation:StateOfOccurrence


StateOfOrigin

The State in the territory of which the consignment was first loaded on an aircraft.

Source: ICAO Annex 1; ICAO Annex 18;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:Organisation:StateOfOrigin


StateOfRegistry

The State on whose register the aircraft is entered.

Source: ICAO Annex 6, Part I, Ninth Edition;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:Organisation:StateOfRegistry

Associations:

Name Type
has NationalRegisteringAuthority


StateOfTheOperator

The State in which the operator's principal place of business is located or, if there is no such place of business, the operator's permanent residence.

Source: ICAO Annex 1; ICAO Annex 13; ICAO Annex 18; ICAO Annex 6;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:Organisation:StateOfTheOperator


StayPhase

A period of 'special activity' when the aircraft will 'stay' in the area defined for a given length of time.

Source: EUROCAE ED-133 v.1.0;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:FlightPhase:StayPhase


Stopway

A defined rectangular area on the ground at the end of take-off run available prepared as a suitable area in which an aircraft can be stopped in the case of an abandoned take-off.

Source: ICAO Annex 14, Vol. I, Fifth Edition;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:Stopway

Associations:

Name Type
adjoins Runway


Stratus

Generally grey cloud layer with a fairly uniform base, which may give drizzle, ice prisms or snow grains. When the Sun is visible through the cloud, its outline is clearly discernible; Stratus does not produce halo phenomena except, possibly, at very low temperatures; sometimes it appears in the form of ragged patches.

Source: WMO International Meteorological Vocabulary;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:Stratus


Subnetwork

An actual implementation of a data network that employs a homogeneous protocol and addressing plan, and is under the control of a single authority.

Source: ICAO Annex 10, Vol. III, Second Edition;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:CommunicationInfrastructure:Subnetwork


SupercooledLargeDroplet

Liquid droplets with diameters greater than 0.05 mm (50 microns) at temperatures less than 0�C, i.e., freezing rain or freezing drizzle. Due to their relatively large size and high mass, SLD are particularly hazardous to aircraft, since they can impact the aircraft surfaces outside the ice-protected regions.

Source: FAA (Federal Aviation Administration);
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:SupercooledLargeDroplet


SurfaceContamination

Presence or removal of hazardous conditions on aerodrome movement areas due to snow, ice, slush, water.

Source: EUROCONTROL-FAA AIXM v.5.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:AerodromeOperations:SurfaceContamination

Associations:

Name Type
contaminates AircraftStand
contaminates Runway
contaminates Apron
contaminates Taxiway
contaminates TouchDownLiftOff
contaminates Aerodrome


SurfaceForecastReport

A report containing forecasts about surface meteorological conditions.

Source: ICAO Annex 3;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:InformationServicesProducts:MeteorologicalInformationProduct:SurfaceForecastReport


SurfaceLevelHeliport

A heliport located on the ground or on the water.

Source: ICAO Annex 1; ICAO Annex 14;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:SurfaceLevelHeliport


SurfaceReport

A report containing observations of meteorological conditions made from the surface of the earth or water bodies.

Source: ICAO Annex 3;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:InformationServicesProducts:MeteorologicalInformationProduct:SurfaceReport


SurfaceWeatherObservation

Surface weather observations provide numerous weather elements, that are observed by a variety of sensors, both measurable (e.g., pressure and temperature) and derived elements (e.g., density altitude).

Source: FAA (Federal Aviation Administration);
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:SurfaceWeatherObservation


SurveillanceRadar

Radar equipment used to determine the position of an aircraft in range and azimuth.

Source: ICAO; ICAO Annex 1; ICAO Annex 10;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:SurveillanceInfrastructure:SurveillanceRadar


SurveillanceRadarElement

A component of a Precision Approach Radar System which, when installed, provides the orientation information required to direct the aircraft to the correct position and altitude so that the final approach can be instituted.

Source: ICAO Doc 8071;
Abbreviations: SRE
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:SurveillanceInfrastructure:SurveillanceRadarElement


SurvivalELT

An ELT which is removable from an aircraft, stowed so as to facilitate its ready use in an emergency, and manually activated by survivors.

Source: ICAO Doc 9713;
Abbreviations: ELT(S)
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Aircraft:SurvivalELT


SurvivalEquipment

Aircraft equipment that can be used by the crew and passengers to assist survival in harsh environments in case of emergency.

Source: FIXM v3.0;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Aircraft:SurvivalEquipment


TACAN

A navigation system developed by military and naval forces providing, as far as the navigating pilot is concerned and for suitably equipped aircraft, the same indication as a VOR/DME system.

Source: EUROCONTROL-FAA AIXM v.5.1;
Synonyms: UHF Tactical Air Navigation Aid
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:NavigationInfrastructure:TACAN


TacticalOperationalPlanning

ATM activities starting near to the actual departure time of the flight (usually 24 hours preceding the flight) during which the ATM system has access to more accurate planning information.

Source: ICAO Doc 9965;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:TacticalOperationalPlanning


TAF

Message to transmit aerodrome forecasts and amendments prepared by the meteorological office designated the meteorological authority concerned.

Source: ICAO Annex 3;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:InformationServicesProducts:MeteorologicalInformationProduct:TAF


TakeOffConfiguration

Aircraft configuration for a given flight. It is the configuration at "take-off".

Source: SESAR;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Aircraft:TakeOffConfiguration

Associations:

Name Type
lists Passenger
has TakeOffWeight
lists CrewMember
is configured at take-off in Flight
is commanded by PilotInCommand
loads Cargo


TakeOffDistanceAvailable

The length of the take-off run available plus the length of the clearway, if provided.

Source: ICAO Annex 14;
Abbreviations: TODA
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:TakeOffDistanceAvailable


TakeOffDistanceAvailableForHelicopter

The length of the FATO plus the length of helicopter clearway (if provided) declared available and suitable for helicopters to complete the take-off.

Source: ICAO Annex 14;
Abbreviations: TODAH
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:TakeOffDistanceAvailableForHelicopter


TakeOffPhase

The phase of flight from the application of take-off power until reaching the first prescribed power reduction, or until reaching the vfr pattern or 1,500 feet (450 metres) above runway end elevation, whichever comes first or the termination (abort) of the take-off.

Source: ICAO ADREP 2000;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:FlightPhase:TakeOffPhase

Associations:

Name Type
includes TakeOffRun
from RunwayDirection
under TakeOffConfiguration


TakeOffRun

The phase of flight from the application of take-off power, through the take-off roll and rotation up to 50 feet [15 metres] above runway end elevation.

Source: ICAO ADREP 2000;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:FlightPhase:TakeOffRun


TakeOffRunAvailable

The length of runway declared available and suitable for the ground run of an aeroplane taking off.

Source: ICAO Annex 14;
Abbreviations: TORA
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:TakeOffRunAvailable


TakeOffTime

Time at which an aircraft leave the ground and becomes airborne.

Source: SESAR;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:FlightEvent:TakeOffTime


TakeOffWeight

The weight of the aircraft at the beginning of the take-off phase.

Source: SESAR;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Aircraft:TakeOffWeight

Associations:

Name Type
is not to exceed MaximumTakeOffWeight


TargetOffBlockTime

The time that an aircraft operator / handling agent estimates that an aircraft will be ready, all doors closed, boarding bridge removed, push back vehicle present, ready to start up / push back immediately upon reception of clearance from the TWR.

Source: SESAR;
Abbreviations: TOBT
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:FlightEvent:TargetOffBlockTime


TargetStartUpApprovalTime

The time provided by ATC taking into account TOBT, CTOT and/or the traffic situation that an aircraft can expect to receive start up / push back approval.

Source: EUROCONTROL A-CDM Implementation manual;
Abbreviations: TSAT
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:TargetStartUpApprovalTime


TaxiChannel

A water channel used for the movement of aircraft between on shore facilities and the water lane.

Source: FAA (Federal Aviation Administration);
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:TaxiChannel

Associations:

Name Type
marked by MarkingBuoy


TaxiInClearance

Information relating to the taxi-in clearance of an aircraft.

Source: ICAO Doc 9965;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:TaxiInClearance

Associations:

Name Type
is sub-process of ArrivalOperations


TaxiPath

A series of surface elements (expressed using aeronautical information elements).

Source: ICAO Doc 9965;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:TaxiPath

Associations:

Name Type
transverses MovementArea


TaxiPhase

The phase of flight in which movement of an aircraft on the surface of an aerodrome under its own power occurs, excluding take-off and landing.

Source: ICAO ADREP 2000;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:FlightPhase:TaxiPhase


Taxiway

A defined path on a land aerodrome established for the taxiing of aircraft and intended to provide a link between one part of the aerodrome and another, including: a) Aircraft stand taxilane. A portion of an apron designated as a taxiway and intended to provide access to aircraft stands only. b) Apron taxiway. A portion of a taxiway system located on an apron and intended to provide a through taxi route across the apron. c) Rapid exit taxiway. A taxiway connected to a runway at an acute angle and designed to allow landing aeroplanes to turn off at higher speeds than are achieved on other exit taxiways thereby minimizing runway occupancy times.

Source: ICAO;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:Taxiway

Associations:

Name Type
part of ManoeuvringArea
has HoldingBay
on Heliport
on Aerodrome


TaxiwayGuidanceLine

Guidance line painted on a taxiway.

Source: ICAO Doc 9881;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:TaxiwayGuidanceLine

Associations:

Name Type
is on Taxiway


TaxiwayHoldingPosition

A designated position at which taxiing aircraft and vehicles must stop and hold position, unless otherwise authorized by the aerodrome control tower.

Source: ICAO; ICAO Doc 9881;
Synonyms: Intermediate Holding Position, TaxiHoldingPosition
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:TaxiwayHoldingPosition

Associations:

Name Type
located on Taxiway
prevents entry onto Runway
situated on GuidanceLine


TaxiwayIntersection

A junction of two or more taxiways.

Source: ICAO Annex 14;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:TaxiwayIntersection

Associations:

Name Type
is intersection of Taxiway


TaxiwayShoulder

An area adjacent to the edge of a taxiway so prepared as to provide a transition between the taxiway and the adjacent surface.

Source: ICAO Annex 14;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:TaxiwayShoulder

Associations:

Name Type
established for Taxiway


TaxiwayStrip

An area including a taxiway intended to protect an aircraft operating on the taxiway and to reduce the risk of damage to an aircraft accidentally running off the taxiway.

Source: ICAO Annex 1; ICAO Annex 14;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:TaxiwayStrip

Associations:

Name Type
includes Taxiway


Temperature

The state of a substance or body with regard to sensible warmth or coldness, referred to some standard of comparison; spec. that quality or condition of a body which in degree varies directly with the amount of heat contained in the body, and inversely with its heat-capacity; commonly manifested by its imparting heat to, or receiving it from, contiguous bodies, and usually measured by means of a thermometer or similar instrument.

Source: Oxford English Dictionary;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:Temperature


TemperatureInversion

Vertical temperature distribution such that temperature increases with height.

Source: WMO International Meteorological Vocabulary;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:TemperatureInversion


TemporaryReservedArea

A defined volume of airspace normally under the jurisdiction of one aviation authority and temporarily reserved, by common agreement, for the specific use by another aviation authority and through which other traffic may be allowed to transit, under ATC clearance.

Source: SESAR;
Synonyms: TemporaryReservedAirspace
Abbreviations: TRA
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:Airspace:TemporaryReservedArea


TemporarySegregatedArea

A defined volume of airspace normally under the jurisdiction of one aviation authority and temporarily segregated, by common agreement, for the exclusive use by another aviation authority and through which other traffic will not be allowed to transit.

Source: SESAR;
Abbreviations: TSA
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:Airspace:TemporarySegregatedArea


Terminal

An installation on an aerodrome with facilities for loading and unloading aircraft and processing traffic (passengers, baggage, cargo and mail).

Source: NATO AAP-6 (2004);
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:Terminal

Associations:

Name Type
is located at Heliport
is located at Aerodrome


TerminalArrivalAltitude

The lowest altitude that will provide a minimum clearance of 300 m (1 000 ft) above all objects located in an arc of a circle defined by a 46 km (25 NM) radius centred on the initial approach fix (IAF), or where there is no IAF on the intermediate approach fix (IF), delimited by straight lines joining the extremity of the arc to the IF. The combined TAAs associated with an approach procedure shall account for an area of 360 degrees around the IF.

Source: ICAO Annex 4;
Synonyms: Terminal Arrival Area
Abbreviations: TAA
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:RouteAndProcedure:TerminalArrivalAltitude

Associations:

Name Type
is associated with InstrumentApproachProcedure
is based on IntermediateFix
is based on InitialApproachFix


TerminalCapacity

The number of passengers and tonnes of cargo per hour which can be processed in a terminal building (sometimes referred to as passenger throughput or cargo throughput).

Source: ICAO Doc 9626;
Synonyms: Passenger Throughput, Cargo Throughput
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:AerodromeOperations:TerminalCapacity

Associations:

Name Type
defined for Terminal


TerminalControlArea

A control area normally established at the confluence of ATS routes in the vicinity of one or more major aerodromes.

Source: ICAO Annex 1; ICAO Annex 11; ICAO Annex 2;
Abbreviations: TMA
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:Airspace:TerminalControlArea

Associations:

Name Type
may have TerminalProcedure
in established the vicinity of Heliport
is established in the vicinity of Aerodrome
is normally established at the confluence of ATSRoute


TerminalProcedure

A series of predetermined manoeuvres with specified protection from obstacles.

Source: EUROCONTROL-FAA AIXM v.5.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:RouteAndProcedure:TerminalProcedure

Associations:

Name Type
may require specific FlightCrewApplicationAndApproval
may use NavigationAidInfrastructure
is protected from Obstacle
serves RunwayDirection
serves TouchDownLiftOff
can be described as a series of ProcedureTransition
protects MinimumSectorAltitude
may include HoldingProcedure
may be restricted from using NavigationArea
may be limited to AircraftCategory
may require specific AircraftCapability


Terrain

The surface of the Earth containing naturally occurring features such as mountains, hills, ridges, valleys, bodies of water, permanent ice and snow, and excluding obstacles.

Source: ICAO Annex 1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Common:Geospatial:Terrain


Tesla

The magnetic flux density given by a magnetic flux of 1 weber per square metre.

Source: ICAO Annex 5;
Abbreviations: T
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Common:UnitsOfMeasure:Tesla


Threshold

The beginning of that portion of the runway usable for landing.

Source: ICAO Annex 1;
Synonyms: Runway Threshold
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:Threshold

Associations:

Name Type
begins the usable part of Runway


ThroughFlight

A particular operation of aircraft, identified by the operator by the use throughout of the same symbol, from point of origin via any intermediate points to point of destination.

Source: ICAO Annex 9;
Synonyms: direct flight
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:ThroughFlight


Time

A finite extent or stretch of continued existence, as the interval separating two successive events or actions, or the period during which an action, condition, or state continues; a finite portion of time (in its infinite sense).

Source: Oxford English Dictionary;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Common:Temporal:Time


TimeConstraint

A restriction brought to the time component of the trajectory of an aircraft.

Source: SESAR;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:Movement:TimeConstraint

Associations:

Name Type
requires WheelsOn
requires WheelsOff
requires OverPoint
requires OffBlock


TimeOver

The time at which a flight arrives over a significant point.

Source: SESAR;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:FlightEvent:TimeOver


Timesheet

The definition of a single time interval, that occurs repeatedly as part of a schedule.

Source: EUROCONTROL-FAA AIXM v.5.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Common:Temporal:Timesheet

Associations:

Name Type
is set of repetitive Period


Tonne

The mass equal to 1 000 kilograms.

Source: ICAO Annex 5;
Abbreviations: t
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Common:UnitsOfMeasure:Tonne


TopOfClimb

The trajectory point at which the trajectory arrives at the cruise flight level. There will be one top-of-climb for each cruise flight level (step climbs).

Source: ICAO;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:Movement:TopOfClimb

Associations:

Name Type
marks the end of the ClimbToCruisingLevelOrAltitude
marks the end of a climbing ChangeOfCruiseLevelPhase


TopOfDescent

The trajectory point at which the trajectory begins a descent from the cruise flight level.

Source: ICAO;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:Movement:TopOfDescent

Associations:

Name Type
marks the end of CruisePhase
marks the start of NormalDescent


TornadicVortex

A violently rotating column of air, usually pendant to a cumulonimbus, with circulation reaching the ground. It nearly always starts as a funnel cloud and may be accompanied by a loud roaring noise.

Source: FAA (Federal Aviation Administration);
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:TornadicVortex


TotalEstimatedElapsedTime

For IFR flights, the estimated time required from take-off to arrive over that designated point, defined by reference to navigation aids, from which it is intended that an instrument approach procedure will be commenced, or, if no navigation aid is associated with the destination aerodrome, to arrive over the destination aerodrome. For VFR flights, the estimated time required from take-off to arrive over the destination aerodrome.

Source: ICAO Annex 2;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:TotalEstimatedElapsedTime

Associations:

Name Type
from WheelsOff
to arrive over destination Aerodrome
to intended start of InstrumentApproachProcedure


Touchdown

The point where the nominal glide path intercepts the runway.

Source: ICAO Annex 1; ICAO Annex 10;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:Touchdown


TouchDownLiftOff

A load bearing area on which a helicopter may touch down or lift off.

Source: ICAO Annex 1;
Synonyms: Touchdown and Lift-off Area
Abbreviations: TLOF
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:TouchDownLiftOff

Associations:

Name Type
located at Heliport
part of FinalApproachAndTakeOffArea


TouchDownLiftOffSafeArea

An obstacle-free area situated in the vicinity of a touchdown and lift-off area, provided to protect helicopters during manoeuvring, take-off and / or landing operations.

Source: EUROCONTROL-FAA AIXM v.5.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:TouchDownLiftOffSafeArea

Associations:

Name Type
situated in the vicinity of TouchDownLiftOff


ToweringCumulus

A descriptive term, used mostly in weather observing, for cumulus congestus (Cu con).

Source: WMO International Meteorological Vocabulary;
Synonyms: cumulus congestus
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:ToweringCumulus


Traceability

Ability to trace the history, application or location of that which is under consideration (ISO 9000).

Source: ICAO Annex 1; ICAO Annex 15;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:InformationServicesProducts:AeronauticalInformationProduct:Traceability


Track

The projection on the earth's surface of the path of an aircraft, the direction of which path at any point is usually expressed in degrees from North (true, magnetic or grid).

Source: ICAO Annex 1; ICAO Annex 11; ICAO Annex 2; ICAO Annex 4;
Synonyms: flight track, ground track
Abbreviations: TR
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:Movement:Track

Associations:

Name Type
is projection on the earth's surface of 4DTrajectory


TrajectoryChangePoint

A trajectory point at which a vertical or lateral change, or a change of speed, happens.

Source:
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:Movement:TrajectoryChangePoint

Associations:

Name Type
marks the start of SpeedChange
marks the start of LevelChange
marks the end of LevelChange
marks the end of LateralChange


TrajectoryPoint

A four dimensional point used in defining the flight path of an aircraft.

Source: SESAR;
Synonyms: 4D Trajectory Point
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:Movement:TrajectoryPoint

Associations:

Name Type
has TrajectoryPointUsage
has PredictedGroundSpeed
has PredictedAirspeed
has vertical component Level
has AlongRouteDistance
applies at ATMTrajectoryConstraint
is a 4DPoint
may coincide with InfrastructurePoint


TrajectoryPointUsage

The usage of a point when describing the movement of a flight.

Source:
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:Movement:TrajectoryPointUsage

Associations:

Name Type
triggers FlightEvent


TrajectoryPrediction

The process that estimates a future trajectory of an aircraft through computation.

Source: SESAR;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:TrajectoryPrediction

Associations:

Name Type
outputs 4DTrajectory
uses MeteorologicalForecast
uses AssumedAltimeterSetting


TrajectorySegment

A line connecting consecutive trajectory points.

Source: SESAR;
Synonyms: TrajectoryElement
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:Movement:TrajectorySegment

Associations:

Name Type
represents a portion of 4DTrajectory
represents a subset of the trajectory corresponding to FlightPhase
uses TaxiPath
uses RouteSegment
uses RoutePortion
uses ATSRoute


TrajectorySynchronisation

ATM activities aiming to obtain flight information and provide constraints onto the flight trajectory to achieve flow objectives and to conduct strategic Conflict management.

Source: ICAO Doc 9965;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:TrajectorySynchronisation

Associations:

Name Type
aims to conduct strategic management of Conflict
involves TrajectoryPrediction


TransferOfControlPoint

A defined point located along the flight path of an aircraft, at which the responsibility for providing air traffic control service to the aircraft is transferred from one control unit or control position to the next.

Source: ICAO Doc 4444;
Abbreviations: TCP
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:TrafficSynchronization:Coordination:TransferOfControlPoint


TransferringUnitOrController

Air traffic control unit in the process of transferring the responsibility for providing air traffic control service to an aircraft to the next air traffic control unit along the route of flight.

Source: ICAO Annex 1; ICAO Annex 11; ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:Role:TransferringUnitOrController

Associations:

Name Type
initially is SendingUnitOrController
during dialogue may be ReceivingUnitOrController
initiates and requests CoordinationAndTransfer


TransitionAltitude

The altitude at or below which the vertical position of an aircraft is controlled by reference to altitudes.

Source: ICAO Annex 2; ICAO Annex 4;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:Airspace:TransitionAltitude


TransitionAltitudeOrLevelCrossing

The event of reaching the transition altitude (in climb) or level (in descent).

Source: ICAO;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:FlightEvent:TransitionAltitudeOrLevelCrossing

Associations:

Name Type
marks the crossing in descent of the TransitionLevel
marks the crossing in climb of the TransitionAltitude


TransitionLayer

The airspace between the transition altitude and the transition level.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:Airspace:TransitionLayer

Associations:

Name Type
has bound defined by TransitionLevel
has bound defined by TransitionAltitude


TransitionLevel

The lowest flight level available for use above the transition altitude.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:Airspace:TransitionLevel


TREND

A concise statement of the expected significant changes in the meteorological conditions at that aerodrome to be appended to a local routine or local special report, or a METAR or SPECI.

Source: ICAO Annex 3;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:InformationServicesProducts:MeteorologicalInformationProduct:TREND


TributaryStation

An aeronautical fixed station that may receive or transmit messages and/or digital data but which does not relay except for the purpose of serving similar stations connected through it to a communication centre.

Source: ICAO Annex 10, Vol. II, Sixth Edition;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:CommunicationInfrastructure:TributaryStation


TropicalCyclone

Cyclone of tropical origin of small diameter (some hundreds of kilometres) with minimum surface pressure in some cases less than 900 hPa, very violent winds and torrential rain; sometimes accompanied by thunderstorms. It usually contains a central region, known as the "eye" of the storm, with a diameter of the order of some tens of kilometres, and with light winds and more or less lightly clouded sky.

Source: WMO METeorological Community Exchange (METCE);
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:TropicalCyclone


TropicalCycloneAdvisory

Advisory information regarding the position, forecast direction and speed of movement, central pressure and maximum surface wind of a tropical cyclone.

Source: ICAO; ICAO Annex 3;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:InformationServicesProducts:MeteorologicalInformationProduct:TropicalCycloneAdvisory

Associations:

Name Type
concerns TropicalCyclone


TropicalCycloneAdvisoryCentre

A meteorological centre designated by regional air navigation agreement to provide advisory information to meteorological watch offices, world area forecast centres and international OPMET databanks regarding the position, forecast direction and speed of movement, central pressure and maximum surface wind of tropical cyclones.

Source: ICAO; ICAO Annex 3;
Abbreviations: TCAC
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:Organisation:TropicalCycloneAdvisoryCentre


TropicalCycloneSIGMET

A SIGMET that reports the presence of a tropical cyclone.

Source: ICAO IWXXM;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:InformationServicesProducts:MeteorologicalInformationProduct:TropicalCycloneSIGMET

Associations:

Name Type
concerns TropicalCyclone


Tropopause

The boundary between the troposphere and the stratosphere, where an abrupt change in lapse rate usually occurs.

Source: WMO International Meteorological Vocabulary;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:Tropopause


TrueAirspeed

The speed of the aeroplane relative to undisturbed air.

Source: ICAO Doc 9713;
Abbreviations: TAS
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:TrueAirspeed


Turbulence

Atmospheric flow regime characterized by chaotic and stochastic property changes. This includes low momentum diffusion, high momentum convection, and rapid variation of pressure and velocity in space and time.

Source: EUROCONTROL-FAA WXXM v.1.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:Turbulence


TurnaroundTime

The time spent on the ground during a flight duty period between two flight sectors.

Source: ICAO Doc 9713;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:AerodromeOperations:Turnaround:TurnaroundTime


TurnDegrees

Instruction to turn a specified number of degrees left or right.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:TurnDegrees


TurnHeading

Instruction to turn left or right as specified on to the specified heading.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:TurnHeading


TurningBasin

A water area used for the maneuvering of aircraft where the use of water surface is restricted. Turning basins should be located adjacent to shoreline facilities and at each end of the water operating area.

Source: FAA (Federal Aviation Administration);
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:TurningBasin


TypeCertificate

A document issued by a Contracting State to define the design of an aircraft type and to certify that this design meets the appropriate airworthiness requirements of that State.

Source: ICAO Annex 8;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:DocumentAndAgreement:TypeCertificate


UncertaintyPhase

A situation wherein uncertainty exists as to the safety of an aircraft and its occupants.

Source: ICAO Annex 12;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:EmergencyOperations:UncertaintyPhase


UnmannedAerialVehicle

An unmanned aerial vehicle is a pilotless aircraft, in the sense of Article 8 of the Convention on International Civil Aviation, which is flown without a pilot-in-command on-board and is either remotely and fully controlled from another place (ground, another aircraft, space) or programmed and fully autonomous.

Source: ICAO Doc 9854;
Abbreviations: UAV
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Aircraft:UnmannedAerialVehicle


UnplannedHolding

A specific holding procedure requested at an en-route fix on airway or route radials, bearings, or courses.

Source: EUROCONTROL-FAA AIXM v.5.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:RouteAndProcedure:UnplannedHolding


UpperAirObservingSystem

The upper-air observing program of NOAA, composed a network of ground-based remote-sensing wind profilers, en-route commercial aircraft in-situ observations (MDCRS), upper-air observations taken manually by pilots and disseminated by PIREPs, and of a network of rawinsonde stations (section 0).

Source: [AIRM]
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:UpperAirObservingSystem


UpperFlightInformationRegion

An upper airspace of defined dimensions within which flight information service and alerting service are provided.

Source: EUROCONTROL-FAA AIXM v.5.1;
Abbreviations: UIR
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:Airspace:UpperFlightInformationRegion


VDLStation

An aircraft-based or ground-based physical entity, capable of VDL Mode 2, 3 or 4.

Source: ICAO Annex 10, Vol. III, Second Edition;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:CommunicationInfrastructure:VDLStation

Associations:

Name Type
enables VHFDigitalLink


VerticalConstraint

A restriction brought to the vertical component of the trajectory of an aircraft.

Source: SESAR;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:Movement:VerticalConstraint

Associations:

Name Type
requires OverPoint
requires LevelChange


VerticalPathAngle

Angle of the published final approach descent in baro-VNAV procedures.

Source: ICAO Doc 8168, Vol. I, 5th Ed;
Abbreviations: VPA
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:RouteAndProcedure:VerticalPathAngle


VerticalSeparationMinima

The minimum difference between levels in terms of flight levels or altitudes between aircraft using prescribed altimeter setting procedures.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ConflictManagement:VerticalSeparationMinima


VerticalStructure

All fixed and mobile objects, or parts thereof that extend above the surface of the Earth.

Source: EUROCONTROL-FAA AIXM v.5.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Common:Geospatial:VerticalStructure

Associations:

Name Type
is above or below Terrain
has extent Geometry
may be assessed to be Obstacle


VFRFlight

A flight conducted in accordance with the visual flight rules.

Source: ICAO Annex 2;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:VFRFlight


VGSIProtectionArea

An area protecting VGSI signal coverage by forbidding objects in the area.

Source: EUROCONTROL-FAA AIXM v.5.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:VGSIProtectionArea

Associations:

Name Type
protects signal coverage of VisualGlideSlopeIndicator


A constituent mobile subnetwork of the aeronautical telecommunication network (ATN), operating in the aeronautical mobile VHF frequency band. In addition, the VDL may provide non-ATN functions such as, for instance, digitized voice.

Source: ICAO Annex 10, Vol. III, Second Edition;
Abbreviations: VDL
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:CommunicationInfrastructure:VHFDigitalLink


VisualApproachProcedure

A series of predetermined manoeuvres by visual reference, from the initial approach fix, or where applicable, from the beginning of a defined arrival route to a point from which a landing can be completed and thereafter, if a landing is not completed, a go-around procedure can be carried out.

Source: ICAO Annex 4;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:RouteAndProcedure:VisualApproachProcedure


VisualFlightRules

A set of rules governing the conduct of flight under visual meteorological conditions.

Source:
Abbreviations: VFR
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:VisualFlightRules


VisualGlideSlopeIndicator

A visual guidance system that provides 'below/above glidepath' information to an aircraft executing an approach to a specific runway direction.

Source: EUROCONTROL-FAA AIXM v.5.1;
Abbreviations: VGSI
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:NavigationInfrastructure:VisualGlideSlopeIndicator

Associations:

Name Type
provides guidance for RunwayDirection


VisualGroundGuidanceSystem

Any visual guidance systems used at aerodromes to help aircraft and other vehicles circulating on the platform to navigate from one location to another. This covers the markings and well as the light systems on the runways, taxiways, aprons.

Source: SESAR;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:NavigationInfrastructure:VisualGroundGuidanceSystem


VisualManoeuvringCirclingArea

The area in which obstacle clearance should be taken into consideration for aircraft carrying out a circling approach.

Source: ICAO Doc 8168, Vol. I, 5th Ed;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:Airspace:VisualManoeuvringCirclingArea

Associations:

Name Type
is area in which obstacle clearance should be taken into account for CirclingApproach


VisualNavigationAid

Any visual system which provides information to be used by the pilot or aircraft navigation systems for position determination or flight path guidance.

Source: ICAO Doc 9294;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:NavigationInfrastructure:VisualNavigationAid

Associations:

Name Type
may be implemented at Heliport
is implemented at Aerodrome


VoiceAutomaticTerminalInformationService

The provision of ATIS by means of continuous and repetitive voice broadcasts.

Source: ICAO Annex 1; ICAO Annex 10;
Abbreviations: Voice-ATIS
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:AirTrafficServices:VoiceAutomaticTerminalInformationService


VolcanicActivity

Volcanic unrest or eruption.

Source: SESAR;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:VolcanicActivity

Associations:

Name Type
results in VolcanicAshCloud
is erupting Volcano


VolcanicActivityReport

A report on the occurrence of pre-eruption volcanic activity, volcanic eruptions or ash cloud.

Source: ICAO; ICAO Annex 3;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:InformationServicesProducts:MeteorologicalInformationProduct:VolcanicActivityReport


VolcanicAsh

Extremely fine particles of pulverized rock, the composition of which, generally speaking, is comprised predominantly of silica (> 50 per cent), together with smaller amounts of the oxides of aluminium, iron, calcium and sodium.

Source: SESAR;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:VolcanicAsh


VolcanicAshAdvisory

Advisory information regarding the lateral and vertical extent and forecast movement of volcanic ash in the atmosphere following volcanic eruptions.

Source: ICAO; ICAO Annex 3;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:InformationServicesProducts:MeteorologicalInformationProduct:VolcanicAshAdvisory


VolcanicAshAdvisoryCentre

A meteorological centre designated by regional air navigation agreement to provide advisory information to meteorological watch offices, area control centres, flight information centres, world area forecast centres and international OPMET databanks regarding the lateral and vertical extent and forecast movement of volcanic ash in the atmosphere following volcanic eruptions.

Source: ICAO Annex 3;
Abbreviations: VAAC
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:Organisation:VolcanicAshAdvisoryCentre


VolcanicAshCloud

Ash contaminated atmospheric volume.

Source: EUROCONTROL-FAA WXXM v.1.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:VolcanicAshCloud

Associations:

Name Type
formed from VolcanicAsh


VolcanicAshSIGMET

A SIGMET that reports the presence of volcanic ash conditions.

Source: ICAO IWXXM;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:InformationServicesProducts:MeteorologicalInformationProduct:VolcanicAshSIGMET

Associations:

Name Type
concerns Volcano


Volcano

A geological formation in form of an Earth crust opening/rupture, which allows hot magma, volcanic ash and gases from below the surface, escape into the atmosphere.

Source: EUROCONTROL-FAA WXXM; EUROCONTROL-FAA WXXM v.1.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Common:Geospatial:Volcano

Associations:

Name Type
is part of Terrain


VOLMET

Meteorological information for aircraft in flight.

Source: ICAO; ICAO Annex 1; ICAO Annex 15; ICAO Annex 3;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:InformationServicesProducts:MeteorologicalInformationProduct:VOLMET


VOLMETService

The automatic provision of VOLMET information to aircraft in flight.

Source: SESAR;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:AirTrafficServices:VOLMETService

Associations:

Name Type
distributes VOLMET


Volt

The unit of electric potential difference and electromotive force which is the difference of electric potential between two points of a conductor carrying a constant current of 1 ampere, when the power dissipated between these points is equal to 1 watt.

Source: ICAO Annex 5;
Abbreviations: V
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Common:UnitsOfMeasure:Volt


Volume

The measure of the physical space of any 3-D geometric object.

Source: ISO 19103:2005;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Common:Geometry:Volume


VOR

A short-range, very-high-frequency omnidirectional beacon which provides an indication in the aircraft of the bearing of the beacon, or left-right track indication.

Source: EUROCONTROL-FAA AIXM v.5.1;
Synonyms: VHF omnidirectional radio range
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:NavigationInfrastructure:VOR


WakeTurbulenceCategory

A grouping of aircraft according to the effect of the rotating air mass created behind the wing tips.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Aircraft:WakeTurbulenceCategory


WarningAndAlerts

Message giving concise information of meteorological conditions which could adversely affect aircraft, during any phase of flight.

Source: ICAO; ICAO Annex 3;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:InformationServicesProducts:MeteorologicalInformationProduct:WarningAndAlerts


WarningArea

A non-regulatory airspace of defined dimensions designated over international waters that contains activity which may be hazardous to aircraft not participating in the activity. The purpose of such warning areas is to warn non participating pilots of the potential danger.

Source: EUROCONTROL-FAA AIXM v.5.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:Airspace:WarningArea


WaterLaneEnd

The end of the water lane (typically located at the furthest end of a turning basin) suitable for landing or takeoff runs of aircraft. WaterLaneEnds define the water lane and describe the approach/departure procedure characteristics of a water lane.

Source: FAA (Federal Aviation Administration);
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:WaterLaneEnd

Associations:

Name Type
marked by MarkingBuoy


Watt

The power which gives rise to the production of energy at the rate of 1 joule per second.

Source: ICAO Annex 5;
Abbreviations: W
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Common:UnitsOfMeasure:Watt


Waypoint

A specified geographical location used to define an area navigation route or the flight path of an aircraft employing area navigation.

Source: ICAO Annex 1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirspaceInfrastructure:InfrastructurePoint:Waypoint

Associations:

Name Type
is found using GlobalNavigationSatelliteSystem
is used as segment point for describing the route layout of AreaNavigationRoute
in the context of RNAV Route or RNAV Procedure, is used as SegmentPoint


WeatherInformationSource

An automated or non-automated weather information source.

Source: FAA (Federal Aviation Administration);
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:WeatherInformationSource

Associations:

Name Type
is located at VerticalStructure
is source for MeteorologicalReport


WeatherLayer

An array of clouds and/or obscurations whose bases are at approximately the same level.

Source: FAA (Federal Aviation Administration);
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:WeatherLayer


WeatherObserver

The agent responsible for manual weather observations.

Source: FAA (Federal Aviation Administration);
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:OrganisationRoleAndService:WeatherObserver


WeatherPhenomenon

A meteorological event.

Source: SESAR;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:WeatherPhenomenon

Associations:

Name Type
has Temperature
may be outlined as Contour


WeatherRadar

Radar used to observe weather elements and phenomena.

Source: FAA (Federal Aviation Administration);
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:WeatherRadar


Weber

The magnetic flux which, linking a circuit of one turn, produces in it an electromotive force of 1 volt as it is reduced to zero at a uniform rate in 1 second.

Source: ICAO Annex 5;
Abbreviations: Wb
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Common:UnitsOfMeasure:Weber


WheelsOff

Event in which an aircraft takes-off.

Source: SESAR;
Synonyms: TakeOff
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:FlightEvent:WheelsOff

Associations:

Name Type
occurs during TakeOffPhase
happens during TakeOffRun
qualifies DepartureSurfaceSegment
wheels up at TakeOffTime


WheelsOn

Event in which an aircraft touches down.

Source: SESAR;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Flight:FlightEvent:WheelsOn

Associations:

Name Type
qualifies ArrivalSurfaceSegment
marks the end of the LevelOffTouchdown
occurs during LandingPhase
occurs at LandingTime


WhenAbleProceedDirectToPosition

Instruction to proceed, when able, directly to the specified position.

Source: ICAO Doc 4444;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:ATMServiceDeliveryManagement:WhenAbleProceedDirectToPosition


Wind

Air motion relative to the Earth's surface. Unless otherwise specified, only the horizontal component is considered.

Source: WMO International Meteorological Vocabulary;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:Wind


WindLayer

Vertically bounded area wind phenomenon, characterized by several attributes of type WindDirection, WindSpeed, a position and a height.

Source: EUROCONTROL-FAA WXXM v.1.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:WindLayer


WindShear

Local variation of the wind vector or any of its components in a given direction.

Source: EUROCONTROL-FAA WXXM v.1.1;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Meteorology:WindShear


WindShearWarning

A message giving concise information on the observed or expected existence of wind shear which could adversely affect aircraft on the approach path or take-off path or during circling approach between runway level and 500 m. (1 600 ft) above that level and aircraft on the runway during the landing roll or take-off run.

Source: ICAO Annex 3;
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:AirTrafficOperations:InformationServicesProducts:MeteorologicalInformationProduct:WindShearWarning


WorkArea

A part of an aerodrome in which maintenance or construction works are in progress.

Source: EUROCONTROL-FAA AIXM v.5.1;
Synonyms: ConstructionArea
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:WorkArea

Associations:

Name Type
at Aerodrome


WorldAreaForecastCentre

A meteorological centre designated to prepare and issue significant weather forecasts and upper-air forecasts in digital form on a global basis direct to States by appropriate means as part of the aeronautical fixed service.

Source: ICAO Annex 3;
Abbreviations: WAFC
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Stakeholders:Organisation:WorldAreaForecastCentre


WorldGeodeticSystem1984

WGS84 is an Earth-centered, Earth-fixed terrestrial reference system and geodetic datum adopted as the common geodetic reference frame for civil aviation.

Source: SESAR;
Abbreviations: WGS84
urn: urn:aero:airm:1.0.0:ConceptualModel:Subjects:Common:Geometry:WorldGeodeticSystem1984