Conceptual Model

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Supplement Concept Definition
4DPoint Point described by three-dimensional (3D) coordinates and a time.
European Supplement ZeroRateRegulation An ATFCM measure with a rate set to zero, which means that no flight can be accommodated during the time of applicability
WorldGeodeticSystem1984 WGS84 is an Earth-centered, Earth-fixed terrestrial reference system and geodetic datum adopted as the common geodetic reference frame for civil aviation.
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.
WorkArea A part of an aerodrome in which maintenance or construction works are in progress.
European Supplement WINTEM Forecast charts for upper wind and temperature.
European Supplement WingOperationCentre A generic term which designates the operational processes and services directly related to the airspace users and linked to Mission Trajectories and other aerial activities.
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.
European Supplement WindShearAlert A message generated by automated, ground-based, wind shear remote-sensing or detection equipment, giving concise, up-to-date information related to the observed existence of wind shear involving a headwind/tailwind change of 7.5 m/s (15 kt) or more which could adversely affect aircraft on the final approach path or initial take-off path and aircraft on the runway during the landing roll or take-off run.
WindShear Local variation of the wind vector or any of its components in a given direction.
WindLayer Vertically bounded area wind phenomenon, characterized by several attributes of type WindDirection, WindSpeed, a position and a height.
Wind Air motion relative to the Earth's surface. Unless otherwise specified, only the horizontal component is considered.
WhenAbleProceedDirectToPosition Instruction to proceed, when able, directly to the specified position.
European Supplement WheelsOnPoint The point at which the aircraft is predicted to be wheels on the runway for arrival.
WheelsOn Event in which an aircraft touches down.
European Supplement WheelsOffPoint The point at which the aircraft is predicted to be wheels off the runway on departure.
WheelsOff Event in which an aircraft takes-off.
European Supplement WhatIfTrajectory A copy of the real trajectory of a flight used to negotiate potential changes to it without affecting the corresponding data for the actual flight.
European Supplement WhatIfManagerPublisher A Flight Object Management role that has the following responsibilities: - Creation of the WIFO to query a WIC regarding FO changes. - Publishing of the WIFO to a unique contributor (WIC). - Collects and updates the value of the changed Topics of WIFO, being responsible for the consistency of the WIFO. - Provide the agreements regarding the WIFO to the manager of the real Flight Object. The agent in this role is typically a participant (transferring or receiving ATSU) in a coordination process.
European Supplement WhatIfManagementRole A role played by an Agent in relation to information exchange using the What If Flight Object.
European Supplement WhatIfFlightObjectDataset A Flight Object data message structure exchanged for the purpose of negotiating potential changes to the flight data. Several What-If Flight Objects may be created for the same real" flight object"
European Supplement WhatIfFlight A copy of the real flight used to negotiate potential changes to the flight data without affecting the corresponding data for the actual flight.
European Supplement WhatIfContributor A Flight Object Management role that has the following responsibilities: - To answer to the WIMP by: - Accepting a proposed WIFO - Rejecting the proposed WIFO - Provide a counter proposal to the WIMP by sending the modifications to the proposed WIFO.
European Supplement WhatIfContext A set of real or what-if flights.
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.
WeatherRadar Radar used to observe weather elements and phenomena.
WeatherPhenomenon A meteorological event.
WeatherObserver The agent responsible for manual weather observations.
WeatherLayer An array of clouds and/or obscurations whose bases are at approximately the same level.
WeatherInformationSource An automated or non-automated weather information source.
Waypoint A specified geographical location used to define an area navigation route or the flight path of an aircraft employing area navigation.
European Supplement Waypoint A specified geographical location used to define an area navigation route or the flight path of an aircraft employing area navigation.
Watt The power which gives rise to the production of energy at the rate of 1 joule per second.
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.
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.
WarningAndAlerts Message giving concise information of meteorological conditions which could adversely affect aircraft, during any phase of flight.
European Supplement WakeTurbulenceSeparationMinima The minimum separation between fixed wing aircraft on approach to land, or on take-off into initial climb, as defined by the use of aircraft categories based on aircraft maximum take-off mass which is judged to be a suitable proxy for the strength of the turbulence which may be created, behind large jet aircraft at relatively slow speeds, by the generation of wing tip wake vortices.
WakeTurbulenceCategory A grouping of aircraft according to the effect of the rotating air mass created behind the wing tips.
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.
Volume The measure of the physical space of any 3-D geometric object.
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.
VOLMETService The automatic provision of VOLMET information to aircraft in flight.
VOLMET Meteorological information for aircraft in flight.
European Supplement VOLMET Meteorological information for aircraft in flight.
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.
VolcanicAshSIGMET A SIGMET that reports the presence of volcanic ash conditions.
VolcanicAshCloud Ash contaminated atmospheric volume.
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.
VolcanicAshAdvisory Advisory information regarding the lateral and vertical extent and forecast movement of volcanic ash in the atmosphere following volcanic eruptions.
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.
VolcanicActivityReport A report on the occurrence of pre-eruption volcanic activity, volcanic eruptions or ash cloud.
VolcanicActivity Volcanic unrest or eruption.
European Supplement VoiceAutomaticVOLMETService The provision of VOLMET by means of continuous and repetitive voice broadcasts.
VoiceAutomaticTerminalInformationService The provision of ATIS by means of continuous and repetitive voice broadcasts.
European Supplement VisualObstacleAlerting Any visual alerting system (lights and others) put generally on top of obstacles to warn pilots on the existence and location of potential danger to aviation created by an obstacle.
VisualNavigationAid Any visual system which provides information to be used by the pilot or aircraft navigation systems for position determination or flight path guidance.
VisualManoeuvringCirclingArea The area in which obstacle clearance should be taken into consideration for aircraft carrying out a circling approach.
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.
VisualGlideSlopeIndicator A visual guidance system that provides 'below/above glidepath' information to an aircraft executing an approach to a specific runway direction.
VisualFlightRules A set of rules governing the conduct of flight under visual meteorological conditions.
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.
European Supplement VisualAid Any visual system which indicates the existence of an entity.
VHFDigitalLink 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.
European Supplement VHF8.33Requirement All IFR/GAT flights or parts thereof operating in 8.33 kHz airspace above FL195 within the IFPZ or below FL195 in the airspaces where 8.33 kHz is implemented, are required to carry the 8.33 kHz radio equipment, except where exemptions apply (as defined in the national AIP of the State concerned) and as specified by the terms of those exemptions. Whenever an aircraft is equipped with the 8.33 kHz radios, the letter Y shall be inserted in Item 10: Equipment, of the filed flight plan.
European Supplement VHF8.33kHzChannelSpacing Reduced channel spacing in the VHF band from the usual 25 kHz to 25/3 kHz.
VGSIProtectionArea An area protecting VGSI signal coverage by forbidding objects in the area.
VFRFlight A flight conducted in accordance with the visual flight rules.
VerticalStructure All fixed and mobile objects, or parts thereof that extend above the surface of the Earth.
VerticalSeparationMinima The minimum difference between levels in terms of flight levels or altitudes between aircraft using prescribed altimeter setting procedures.
European Supplement VerticalProfile A description of the aircraft motion in the vertical plane above the ground track, in terms of its position, speed, bank angle and engine power setting.
VerticalPathAngle Angle of the published final approach descent in baro-VNAV procedures.
VerticalConstraint A restriction brought to the vertical component of the trajectory of an aircraft.
European Supplement VerticalConstraint A restriction brought to the vertical component of the trajectory of an aircraft.
European Supplement Vehicle Any means of carriage, conveyance, or transport.
VDLStation An aircraft-based or ground-based physical entity, capable of VDL Mode 2, 3 or 4.
European Supplement VariableTaxiTime The estimated time that an aircraft spends taxiing between its parking stand and the runway or vice versa.
European Supplement VariableGeometryArea A reserved airspace composed of one core area and one or several extension areas. Anytime the Variable Geometry Area is activated, the core is activated and a sub-part of extension areas is activated, based on the mission profile.
European Supplement UserPreferredTrajectory A trajectory initially provided by the Airspace User which may be amended during planning phase to integrate ATM constraints from DCB and during execution phase to integrate new ATM constraints from dynamic DCB. Alternate user preferred trajectory may be associated to the RBT/RMT to face pre-defined scenarios.
European Supplement UserPreferredRoute A representation of the airborne phase of a flight as an expression of the Business / Mission intentions of the Airspace User.
European Supplement UserDefinedSegment A segment of a great circle connecting any combination of two user defined or published waypoints.
UpperFlightInformationRegion An upper airspace of defined dimensions within which flight information service and alerting service are provided.
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).
European Supplement UpdatedAispaceUsePlan An ASM message of NOTAM status issued by an AMC to update and supersede AUP/previous UUP information.
UnplannedHolding A specific holding procedure requested at an en-route fix on airway or route radials, bearings, or courses.
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.
European Supplement UncontrolledAirspace Airspace type of Class G and specified Class F airspace within which ATC service is not provided.
UncertaintyPhase A situation wherein uncertainty exists as to the safety of an aircraft and its occupants.
European Supplement UltimateCapacity The maximum number of aircraft operations that an airfield can accommodate during a specified time period when there is continuous demand for service.
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.
European Supplement TurnToPoint Instruction to turn a specified number of degrees left or right at a specific position.
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.
TurnHeading Instruction to turn left or right as specified on to the specified heading.
TurnDegrees Instruction to turn a specified number of degrees left or right.
TurnaroundTime The time spent on the ground during a flight duty period between two flight sectors.
European Supplement TurnaroundTime The time spent on the ground during a flight duty period between two flight sectors.
European Supplement Turnaround The arrival, unloading, and preparation for the return journey of an aircraft.
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.
TrueAirspeed The speed of the aeroplane relative to undisturbed air.
Tropopause The boundary between the troposphere and the stratosphere, where an abrupt change in lapse rate usually occurs.
TropicalCycloneSIGMET A SIGMET that reports the presence of a tropical cyclone.
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.
TropicalCycloneAdvisory Advisory information regarding the position, forecast direction and speed of movement, central pressure and maximum surface wind of a tropical cyclone.
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."
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.
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.
TransitionLevel The lowest flight level available for use above the transition altitude.
TransitionLayer The airspace between the transition altitude and the transition level.
European Supplement TransitionAltitudeOrLevelPoint The point at which the trajectory reaches the transition altitude (in climb) or level (in descent).
TransitionAltitudeOrLevelCrossing The event of reaching the transition altitude (in climb) or level (in descent).
TransitionAltitude The altitude at or below which the vertical position of an aircraft is controlled by reference to altitudes.
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.
European Supplement 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.
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.
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.
European Supplement 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.
European Supplement TrajectorySuspension After an open loop instruction, the RBT/RMT is suspended" until such times as a new instruction is given to resume the original RBT/RMT."
TrajectorySegment A line connecting consecutive trajectory points.
TrajectoryPrediction The process that estimates a future trajectory of an aircraft through computation.
European Supplement TrajectoryPrediction The process that estimates a future trajectory of an aircraft through computation.
TrajectoryPointUsage The usage of a point when describing the movement of a flight.
TrajectoryPoint A four dimensional point used in defining the flight path of an aircraft.
European Supplement TrajectoryGeneratorModel The model that is used to generate the great circle distance trajectory of the flights between the departure and arrival aerodrome TMAs.
TrajectoryChangePoint A trajectory point at which a vertical or lateral change, or a change of speed, happens.
European Supplement TrajectoryChangePoint A trajectory point at which an altitude level-off will be initiated or terminated, at which the speed target (Indicated or Mach) will change to a new target, or at which the course is expected to change.
European Supplement TrafficVolumeSet A set of Traffic volumes relating to a single Flow Management Position (FMP).
European Supplement TrafficVolumeActivationPlan The activation status of a Traffic Volume over a given period of time.
European Supplement TrafficVolume A set of conditions used to identify the flights over an airspace, point, aerodrome or set of aerodromes so that they can be monitored or regulated within the tactical/pre-tactical Air Traffic Flow and Capacity Management (ATFCM) system.
European Supplement TrafficOrientationScheme A strategic ATFM measure that (re-) route traffic flows.
European Supplement TrafficLoad The air traffic according to the best information available.
European Supplement TrafficFlow Flights with common entry locations upstream, downstream or both with respect to a reference location.
European Supplement TrafficDemand The air traffic according to the flight plans filed by the aircraft operator. It takes in account any flight plan modifications (CHG, DLA, etc.).
European Supplement TrafficCount The number of aircraft on a location during a time period.
European Supplement TrafficBunching Packets of aircraft arriving at the same, unexpected time, in a congested area.
European Supplement TrackDirectionChange A change of track direction during the execution of the Flight.
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).
Traceability Ability to trace the history, application or location of that which is under consideration (ISO 9000).
ToweringCumulus A descriptive term, used mostly in weather observing, for cumulus congestus (Cu con).
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.
TouchDownLiftOff A load bearing area on which a helicopter may touch down or lift off.
European Supplement TouchDownLiftOff A load bearing area on which a helicopter may touch down or lift off.
Touchdown The point where the nominal glide path intercepts the runway.
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.
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.
TopOfDescent The trajectory point at which the trajectory begins a descent from the cruise flight level.
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).
Tonne The mass equal to 1 000 kilograms.
European Supplement TOBTUpdateStatus A code describing the status of the update of the TOBT.
European Supplement TimeToRemoveFromSequence A parameter that prevents a change to a later CTOT when the flight is already in the departure sequence. It may be adjusted at any time depending on the local aerodrome traffic situation and may vary during the day The CTOT will no longer be modified after CTOT - taxi time - TRS.
European Supplement TimeToInsertInSequence A parameter that prevents an improvement into an already organised departure sequence. It may be adjusted at any time depending on the local aerodrome traffic situation and may vary during the day. The TIS parameter is not relevant when ATC has sent an REA message for a flight. The TIS makes sure that a CTOT improvement cannot be sent at short notice as the aerodrome requires some time to introduce an aircraft in the departure sequence (the new CTOT cannot be earlier than clock time + TIS + taxi time).
European Supplement TimeToGainOrLose An arrival management advisory in the form of the amount of time that a flight is supposed to lose or gain to arrive at the metering fix to land at the AMAN Planned Threshold Time (APTT).
Timesheet The definition of a single time interval, that occurs repeatedly as part of a schedule.
TimeOver The time at which a flight arrives over a significant point.
TimeConstraint A restriction brought to the time component of the trajectory of an aircraft.
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).
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.
Threshold The beginning of that portion of the runway usable for landing.
Tesla The magnetic flux density given by a magnetic flux of 1 weber per square metre.
European Supplement TerrainDataSet Data representing terrain surface in the form of continuous elevation values at all intersections (points) of a defined grid, referenced to common datum.
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.
TerminalProcedure A series of predetermined manoeuvres with specified protection from obstacles.
TerminalControlArea A control area normally established at the confluence of ATS routes in the vicinity of one or more major aerodromes.
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).
European Supplement 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).
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.
Terminal An installation on an aerodrome with facilities for loading and unloading aircraft and processing traffic (passengers, baggage, cargo and mail).
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.
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.
European Supplement TemporaryCapacity The temporary hourly capacity values for the period of the week within which it is applicable. Temporary overrides Permanent and Default Capacity.
TemperatureInversion Vertical temperature distribution such that temperature increases with height.
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.
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.
TaxiwayShoulder An area adjacent to the edge of a taxiway so prepared as to provide a transition between the taxiway and the adjacent surface.
TaxiwayIntersection A junction of two or more taxiways.
TaxiwayHoldingPosition A designated position at which taxiing aircraft and vehicles must stop and hold position, unless otherwise authorized by the aerodrome control tower.
TaxiwayGuidanceLine Guidance line painted on a taxiway.
European Supplement TaxiwayConfiguration Configuration of taxiways available for use in a given airport operational mode.
European Supplement TaxiwayBrakingActionObservation An observation of a braking deceleration on a particular taxiway made by a pilot when stopping an aircraft.
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.
European Supplement TaxiRouteInstruction Directives issued by air traffic control for the purpose of requiring a pilot to take a specific action during taxi.
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.
European Supplement 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.
TaxiPath A series of surface elements (expressed using aeronautical information elements).
European Supplement TaxiOutTime Duration of the Taxi-Out phase.
European Supplement TaxiOutPhase Phase of flight from Off-Block until Take-Off, that includes the Surface Movement associated to the departure of a flight
European Supplement TaxiOutClearance The clearance provided by the tower ground controller to the aircraft for taxiing from the parking stand to the take-off runway.
European Supplement TaxiInTime Duration of the Taxi-In phase.
European Supplement TaxiInPhase Phase of flight from Landing until In-Block, that includes the Surface Movement associated to the arrival of a flight
TaxiInClearance Information relating to the taxi-in clearance of an aircraft.
European Supplement TaxiInClearance Information relating to the taxi-in clearance of an aircraft.
European Supplement TaxiClearance Authorization for an aircraft to proceed with the taxi under conditions specified by an air traffic control unit.
TaxiChannel A water channel used for the movement of aircraft between on shore facilities and the water lane.
European Supplement Task A set of objectives set by military authorities to accomplish military missions.
European Supplement TargetTimeOver An ATM computed Time Over a Significant Point which is not a constraint but a progressively refined planning time.
European Supplement TargetTimeOfArrival A Target Time Over referring to a Significant Point associated to an Aerodrome.
European Supplement TargetTakeOffTime The Target Take-Off Time taking into account the TOBT/TSAT plus the EXOT. Each TTOT on one runway is separated from other TTOT or TLDT to represent vortex and/or SID separation between aircraft.
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.
European Supplement TargetReport A general output of the sensor
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.
European Supplement TargetLandingTime Targeted Time from the Arrival management process at the threshold, taking runway sequence and constraints into account. It is not a constraint but a progressively refined planning time used to coordinate between arrival and departure management processes.
European Supplement TargetDeparturePlanningInformation Departure Planning Information message sent between 2 hours before off-block time and ATC time of pre-departure sequencing. It supplies an accurate Target Take-Off Time (TTOT). Use of the variable taxi time calculation will permit an accurate TTOT to be calculated, which will then allow the Network Operations to optimise the CTOT re-calculation and send improvements whenever possible.
TakeOffWeight The weight of the aircraft at the beginning of the take-off phase.
TakeOffTime Time at which an aircraft leave the ground and becomes airborne.
TakeOffRunAvailable The length of runway declared available and suitable for the ground run of an aeroplane taking off.
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.
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.
European Supplement 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.
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.
TakeOffDistanceAvailable The length of the take-off run available plus the length of the clearway, if provided.
TakeOffConfiguration Aircraft configuration for a given flight. It is the configuration at take-off"."
European Supplement TakeOffClearance Authorization for an aircraft to proceed with the take-off under conditions specified by an air traffic control unit.
TAF Message to transmit aerodrome forecasts and amendments prepared by the meteorological office designated the meteorological authority concerned.
European Supplement TacticalRerouting An ATFM measure which requires an aircraft operator to file an alternate route/flight level in order to resolve ATC capacity problems and minimise delays.
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.
European Supplement 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.
European Supplement TacticalATFMPhase An ATFM phase, which takes place on the day of operation.
European Supplement TacticaIReroutingProposal A tactical rerouting proposal by the ATFM.
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.
European Supplement SystemTrack A target report resulting from the correlation, by a special algorithm (tracking) of a succession of radar reported positions for one aircraft. The report normally contains smoothed position and speed vector information.
SurvivalEquipment Aircraft equipment that can be used by the crew and passengers to assist survival in harsh environments in case of emergency.
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.
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.
SurveillanceRadar Radar equipment used to determine the position of an aircraft in range and azimuth.
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).
SurfaceReport A report containing observations of meteorological conditions made from the surface of the earth or water bodies.
SurfaceLevelHeliport A heliport located on the ground or on the water.
SurfaceForecastReport A report containing forecasts about surface meteorological conditions.
SurfaceContamination Presence or removal of hazardous conditions on aerodrome movement areas due to snow, ice, slush, water.
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.
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.
European Supplement SubjectOfAssessment The ATM-related activities to be subject of a specific assessment.
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.
European Supplement StrategicATFMPhase An ATFM phase which takes place seven days or more prior to the day of operation and includes research, planning and coordination activities.
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.
StayPhase A period of 'special activity' when the aircraft will 'stay' in the area defined for a given length of time.
European Supplement StayPhase A period of 'special activity' when the aircraft will 'stay' in the area defined for a given length of time.
European Supplement StayHolding A period of special activity corresponding to an RPAS en-route holding.
European Supplement StayARES A period a special activity within a reserved airspace volume.
European Supplement StayAerodome A period of special activity in the vicinity of an aerodrome, such as carrying out multiple approaches or departures procedures for training purposes (e.g. touch and go).
European Supplement StateVolcanoObservatory A meteorological watch office responsible for monitoring pre-eruption activities, volcanic eruptions and the dispersion of airborne volcanic ashes.
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.
StateOfRegistry The State on whose register the aircraft is entered.
StateOfOrigin The State in the territory of which the consignment was first loaded on an aircraft.
StateOfOccurrence The State in the territory of which an accident or incident occurs.
StateOfManufacture The State having jurisdiction over the organization responsible for the final assembly of the aircraft.
StateOfDesign The State having jurisdiction over the organization responsible for the type design.
StateFlight Operation of an aircraft used in military, customs or police service.
State An internationally recognized geographic entity that provides air traffic service.
European Supplement State An internationally recognized geographic entity that provides air traffic service.
European Supplement StartUpSequence An ordered set of start-ups.
StartUpClearance Approval from air traffic control to proceed with the Start-Up.
European Supplement StartUpClearance Approval from air traffic control to proceed with the Start-Up.
StartUpApprovalTime Time at which the Start-Up of the aircraft engines is approved.
European Supplement StartUpApprovalRequest Pilot's request to ATC to obtain the start-up approval.
StartUp The start up of the aircraft engines by the flight crew upon the ATC approval.
European Supplement StartOfTakeOffRollPoint The trajectory point at the start of take-off roll.
StartOfTakeOffRoll The start of takeoff roll.
StartOfExpectVectors The start of the vectoring, when procedures specify Expect Vectors"."
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.
European Supplement StandDelay Delay period on the aircraft stand.
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.
StandardLevelSector The general rule by which standard level columns are used in a national airspace or within a region.
StandardLevelColumn A column of consecutive cruising levels within a standard level table.
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.
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.
SSRCode The number assigned to a particular multiple pulse reply signal transmitted by a transponder in Mode A or Mode C.
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.
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.
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.
SpeedConstraint A restriction brought to the speed component of the trajectory of an aircraft.
European Supplement SpeedConstraint A restriction brought to the speed component of the trajectory of an aircraft.
SpeedChange A change in speed during the execution of the flight.
European Supplement SpeedChange A change in speed during the execution of the flight.
SpecialVFRFlight A VFR flight cleared by air traffic control to operate within a control zone in meteorological conditions below VMC.
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.
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.
SpecialHandling Special consideration given to the flight by ATS units.
European Supplement SpecialEvent Planned event like new ATC system implementation, big sport event, big military exercise that need to be communicated to Network Management because of their impact on ATM operations.
European Supplement SpecialAIREP Special or other non-routine aircraft observations during any phase of the flight.
European Supplement SPECIAL Local report on special observations for dissemination at the aerodrome of origin (intended for arriving and departing aircraft)
European Supplement SPECI Aerodrome report on special observations for dissemination beyond the aerodrome of origin.
European Supplement SpacingMergingInstruction A representation of an IM S&M Instruction provided by the ground to an aircraft. This instruction is used for the delegation of spacing control between two aircrafts in approach from the ground controller to the flight crew of an aircraft. The IM S&M instruction is provided to the Instructed Aircraft and contains the identification of the Target Aircraft, instructions to be applied, time gap to be respected and a start and an end location
SpaceWeather The physical and phenomenological state of the natural space environment, including the Sun and the interplanetary and planetary environments.
European Supplement SoundExposureLevel A weighted sound exposure level with a reference duration of 1 second (standard event descriptor described e.g. in ISO 1996).
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.
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).
SNOWTAMService SNOWTAM service.
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.
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.
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.
Snow Precipitation of ice crystals, isolated or agglomerated, falling from a cloud.
Smoke Suspension in the atmosphere of small particles produced by combustion.
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.
SlotSwapping A tactical ATFM measure aiming at swapping departure slots that can be applied either manually or via automated means.
European Supplement SlotSwapping A tactical ATFM measure aiming at swapping departure slots that can be applied either manually or via automated means.
European Supplement SlotRevisionMessage A message sent by the Computer-Assisted Slot Allocation (CASA) system, giving a New Calculated Take-Off Time (NEWCTOT). It replaces the previous CTOT and shows either an earlier or later time, or the same time but a different most penalising Regulation.
European Supplement SlotMissedMessage A message originated by an aircraft operator when a slot time given in the Slot Allocation Message(SAM) cannot be achieved but where a new EOBT cannot be supplied.
European Supplement SlotImprovementProposalWantedMessage A message sent by Aircraft Operators in order to change the flight readiness status from Request For Improvement (RFI) status to Slot Improvement Wanted status.
European Supplement SlotImprovementProposalRejection A message sent by an Aircraft Operator for a flight having received a Slot Improvement Proposal (SIP) message. It is used to inform the ETFMS that the proposed improved Calculated Take-Off Time (CTOT) has been rejected. Thus the flight then keeps its original CTOT.
European Supplement SlotImprovementProposalAcceptance A message sent by an Aircraft Operator for a flight which has received a Slot Improvement Proposal (SIP). It is used to inform ETFM that the proposed improved Calculated Take-Off Time(CTOT) is acceptable.
European Supplement SlotImprovementProposal A message sent to a flight in Slot Improvement Proposal Wanted status. It proposes a new and improved Calculated Take-Off Time (CTOT), which may then be accepted or rejected by the Aircraft Operator.
European Supplement SlotCancellationMessage Standard message from Network Operations sent when the flight regulations are canceled.
European Supplement SlotAllocationMessage A message giving a Calculated Take-Off Time (CTOT) sent by the Computer-Assisted Slot Allocation (CASA) system of the Enhanced Tactical Flow Management System (ETFMS) to the operators of regulated flights a maximum of two hours before the Estimated Off-Block Time (EOBT).
European Supplement SlotAllocationList List of all slots corresponding to the regulation rate and period.
European Supplement SimulationDataset A system instance view of the traffic enabling the strategic, pre-tactical or tactical simulation of ATFCM measures or restrictions before applying them operationally.
SimplifiedDirectionalFacility A radio navigation aid providing a final approach course similar to, but less precise than, that of the ILS localizer.
European Supplement SIGWX Forecasts of significant en-route weather phenomena prepared as SIGWX forecasts four times a day by a WAFC.
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.
European Supplement 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.
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.
Sievert The unit of radiation dose equivalent corresponding to 1 joule per kilogram.
Siemens The electric conductance of a conductor in which a current of 1 ampere is produced by an electric potential difference of 1 volt.
Shoulder An area adjacent to the edge of a pavement so prepared as to provide a transition between the pavement and the adjacent surface.
European Supplement ShortTermPlanning The stakeholder specific period of time during which the operational activities are planned on a granularity of days and hours.
European Supplement ShortTermATFCMMeasure An approach to smooth sector workloads by reducing traffic peaks through short-term application of minor ground delays, appropriate flight level capping and exiguous rerouting to a limited number of flights.
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.
European Supplement SharedMissionTrajectory The trajectory published by the military airspace user that is available for collaborative ATM planning purposes.
European Supplement SharedBusinessTrajectory The trajectory published by the civil airspace user that is available for collaborative ATM planning purposes.
ServiceProviderCallsign Information about the operational identifier by which the provider of the service is called and the language used.
European Supplement ServiceDescription Information on a service in form of a Document.
European Supplement ServiceAtStand A service that is provided for the movements at a stand. For example: visual docking guidance system.
European Supplement ServiceAtGate A service that is provided at a gate.
European Supplement ServiceAtApron A service that is provided for the movements at an apron. For example: Marshal management service.
Separator The agent responsible for separation provision for a conflict, being either the airspace user or a separation provision service provider.
European Supplement Separator The agent responsible for separation provision for a conflict, being either the airspace user or a separation provision service provider.
SeparationProvision The tactical process of keeping aircraft away from hazards by at least the appropriate separation minima.
SeparationMode An approved set of rules, procedures and conditions of application associated with separation minima.
SeparationMinima The minimum displacements between an aircraft and a hazard which maintain the risk of collision at an acceptable level of safety.
European Supplement Sensor A generic piece of equipment which detects targets and generates target reports.
SendingUnitOrController Air traffic services unit/air traffic controller transmitting a message.
SegmentPoint A point associated with a defined segment.
SegmentLeg A part of an instrument or visual flight procedure defined by two consecutive significant points.
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.
European Supplement SectorConfigurationPlan The sector configurations to be activated over a given period, minimally for a season.
European Supplement SectorConfiguration The four dimensional description of an ATS unit airspace sector, or group of sectors, which may be operated on a permanent or temporary basis.
SecondarySurveillanceRadar A surveillance radar system which uses transmitters/receivers (interrogators) and transponders.
European Supplement SecondarySurveillanceRadar A surveillance radar system which uses transmitters/receivers (interrogators) and transponders.
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.
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.
SeaplaneRampSite Ramps specifically designed to transit seaplanes from land to water and vice versa.
SeaplaneRampCentreline The centerline of ramps specifically designed to transit seaplanes to or from land or water.
SeaplaneLandingArea A defined area on water at an aerodrome prescribed for the landing and take-off of seaplanes.
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.
European Supplement 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.
European Supplement SchedulesFacilitatedAirport An airport where there is potential for congestion at some periods of the day, week or year which is amenable to resolution by voluntary cooperation between air carriers and where a schedules facilitator has been appointed to facilitate the operations of air carriers operating services or intending to operate services at that airport.
European Supplement ScheduledTurnaroundTime Metric SOBT - SIBT.
European Supplement ScheduledOffBlockTime The time that an aircraft is scheduled to depart from its parking position.
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.
European Supplement ScheduledInBlockTime The time that an aircraft is scheduled to arrive at its first parking position.
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.
European Supplement SaturationCapacity The expected (average") number of runway operations (take-offs and landings) that can be performed in one hour without violating ATC rules, assuming continuous aircraft demand."
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.
European Supplement SATCOMInfrastructure Ensemble combining satellites and satellite ground stations with their equipment to enable air-ground voice and data communication with aircraft via satellites.
SandStorm An ensemble of particles of sand energetically lifted to great heights by a strong and turbulent wind.
Sand A material consisting of comminuted fragments and water-worn particles of rocks (mainly silicious) finer than those of which gravel is composed.
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.
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.
European Supplement RVSMRestriction Level band information relevant for an airspace where the use of RVSM (Reduced Vertical Separation Minimum) certified equipment is required.
European Supplement RVSMRequirement Only aircraft with specially certified altimeters and autopilots may fly in RVSM airspace, otherwise the aircraft must fly lower or higher than the airspace, or seek special exemption from the requirements. Additionally, aircraft operators (airlines or corporate operators) must receive specific approval from the aircraft's state of registry in order to conduct operations in RVSM airspace. Non RVSM approved aircraft may transit through RVSM airspace provided they are given continuous climb throughout the designated airspace, and 2,000 ft vertical separation is provided at all times between the non-RVSM flight, and all others for the duration of the climb/descent.
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.
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.
RunwayTurnPad A defined area on a land aerodrome adjacent to a runway for the purpose of completing a 180-degree turn on a 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.
RunwayShoulder An area adjacent to the edge of a runway so prepared as to provide a transition between the runway and the adjacent surface.
European Supplement RunwaySectionBrakingActionObservation An observation of a braking deceleration on a particular runway section made by a pilot when stopping an aircraft.
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.
RunwayProtectionArea An area situated in the vicinity of a runway or provided to protect aircraft during manoeuvring, take-off and landing operations.
European Supplement RunwayOccupancyTime The amount of time that an aircraft occupies the runway.
European Supplement RunwayMode The intended use of a runway direction for flight operations in the context of a certain runway configuration.
European Supplement RunwayMixSequence The order in which two or more aircraft are planned to land on or take-off from a given runway in a given direction, taking into account ATM constraints. The Runway Mix Sequence consists of a Landing Sequence and a Take-off Sequence.
European Supplement RunwayLandingRate The number of aircraft allowed to approach the Runway Direction per hour, taking all operational constraints into account.
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.
European Supplement RunwayExit The part of arrival surface segment that determines the Runway Exit to be used after landing.
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.
European Supplement RunwayDirectionDesignator The full textual designator of the landing and take-off direction.
RunwayDirection One of the two possible landing and/or take-off directions of a runway or Final Approach and Take-off Area (FATO).
European Supplement RunwayDirection One of the two possible landing and/or take-off directions of a runway or Final Approach and Take-off Area (FATO).
European Supplement RunwayDelay Delay periods related to the runway
RunwayDeclaredDistance A conventional operational distance declared for a runway direction.
RunwayCrossingClearance The clearance required to cross or operate on any active/inactive or closed runway.
European Supplement RunwayConfigurationPlan The runway configurations to be activated over a given period.
European Supplement RunwayConfiguration Configuration of runway directions available for use in a given airport operational mode.
RunwayCentrelinePoint An operationally significant position on the centre line of a runway direction.
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.
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.
European Supplement 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.
European Supplement RunwayBrakingActionObservation An observation of a braking deceleration on a particular runway made by a pilot when stopping an aircraft.
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.
Runway A defined rectangular area on a land aerodrome prepared for the landing and take-off of aircraft.
RulesProcedures An instruction or regulation that needs to be considered by personnel involved in flight operations in relation with an aerodrome or an airspace.
RouteSegment A route or portion of route usually flown without an intermediate stop.
RoutePortion A group of two or more consecutive segments of the same route, which have the usage and/or the same flight restrictions.
RoutePoint A specified geographical location used in defining a flight route.
European Supplement RouteOrProcedureChange A change of reference ATS Route or procedure during the execution of the Flight, including lateral offset.
RouteLayout The way in which the parts of a route are arranged.
European Supplement RouteChange A modification to the Planned Route representing a route clearance that has been issued or yet to be issued to the aircraft.
European Supplement RouteAvailabilityDocument A sole source planning document that combines AIP route flow restrictions with ATFCM routeing requirements designed to make the most effective use of ATC capacity.
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."
Road An established surface route on the movement area meant for the exclusive use of vehicles.
European Supplement REVMessage An OLDI coordination message used to transmit revisions to co-ordination date previously sent in an ACT message provided that the receiving unit does not change as a result of the modification.
European Supplement RetainCTAInstruction An ATC instruction requiring the pilot to retain a CTA constraint.
ResumeNormalSpeed Instruction that the aircraft's normal speed be resumed. The previously issued speed restriction(s) are cancelled.
European Supplement ResumeCTAInstruction An ATC instruction requiring the pilot to resume a CTA constraint.
RestrictedUseAreaVisualAid Marking and/or lighting intended to indicate runways and taxiways, or areas in their vicinity where restrictions of use apply.
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.
Resolution A number of units or digits to which a measured or calculated value is expressed and used.
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.
European Supplement ReroutingRejectionMessage A negative reply to a Rerouting Proposal.
European Supplement ReroutingProposalMessage A message sent to an aircraft operator to offer a different CTOT or to avoid the need for a slot on a new route.
European Supplement ReroutingNotificationMessage A message sent by the network manager sent during the Aircraft Operator What-If Rerouteing function when the original flight plan (FPL) is being cancelled.
European Supplement ReroutingMessage A message involved in tactical rerouting.
RequiredNavigationPerformance A statement of the navigation performance necessary for operation within a defined airspace.
RequiredCommunicationPerformance A statement of the performance requirements for operational communication in support of specific ATM functions.
European Supplement RequestForDirectImprovement A message sent by Aircraft Operators in order to change the flight readiness from Slot Improvement Proposal Wanted (SWM) status to Request For (direct) Improvement status.
European Supplement RequestedSpeed The speed requested by the pilot.
European Supplement RequestedFlightLevel The level requested by the pilot.
European Supplement ReportProcess The process related to the distribution or collection of weather reports.
ReportingPoint A specified (named) geographical location in relation to which the position of an aircraft can be reported.
European Supplement ReportAtPointRequest ATC request to report the position of the aircraft.
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.
European Supplement RepeatNumber Complementary number used to distinguish between different attempts of operating the flight.
European Supplement RemoteDeicing Deicing operation that takes place after the aircraft is off-blocked from its departure stand and before it takes-off in a dedicated stand for the operation.
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.
RejoinRouteByTime Instruction that the cleared flight route is to be rejoined at or before the specified time.
RejoinRouteByPosition Instruction that the cleared flight route is to be rejoined at or before the specified time.
RejectedTakeOffDistanceAvailableForHelicopter The length of the FATO declared available and suitable for helicopters operated in performance class 1 to complete a rejected take-off.
European Supplement RegulationRate The coordinated number of flights that can be accommodated in a certain time period.
European Supplement RegulationCause A structured code indicating the reason for implementing an ATFM Regulation.
European Supplement RegulatedTacticalFlightModel A mathematical model containing a point profile and airspace volume profile for a flight when Air Traffic Flow and Capacity Management (ATFCM) measures have been applied to the flight. Called Calculated Profile on CHMI.
European Supplement RegulatedDemand The air traffic taking according to any regulations that have been implemented.
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.
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.
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).
European Supplement RegionalOrSubRegionalNetworkManagement Set of DCB activities, resources and capabilities for the forecast and plan.
European Supplement RegionalIMBackbone Network providing data and voice services and comprising PENS, sub-regional and national IP networks.
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.
RegionalAirNavigationAgreement Agreement approved by the Council of ICAO normally on the advice of a regional air navigation meeting.
Reflector A reflector used with a precision approach radar.
European Supplement ReferenceMissionTrajectory The mission trajectory which the airspace user agrees to fly and the ANSP and Airports agree to facilitate. It is subject to revisions and updates when operating conditions change outside of agreed tolerances.
European Supplement ReferenceLocation A code used in the Network Manager (NM) Air Traffic Flow and Capacity Management (ATFCM) systems to describe one or more aerodromes, an Air Traffic Control (ATC) waypoint or an entire ATC sector.
European Supplement ReferenceBusinessTrajectory The business trajectory which the airspace user agrees to fly and the ANSP and Airports agree to facilitate. It is subject to revisions and updates when operating conditions change outside of agreed tolerances.
ReduceToMinimumApproachSpeed Instruction to reduce present speed to the minimum safe approach speed.
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.
ReduceSpeedToSpeed Instruction that the present speed is to be reduced to the specified speed and maintained until further advised.
European Supplement ReducedVerticalSeparationMinimum The reduction from 2,000 feet to 1,000 feet of the standard vertical separation required between aircraft flying between FL290 and FL410 inclusive.
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."
European Supplement ReclearanceInFlight A contingency procedure taken in case of unexpected fuel burns according to which the crew can decide, at a certain point of the flight route, whether they will normally follow the filed route or they will land at an alternative aerodrome by following an alternative route.
ReceivingUnitOrController Air traffic services unit/air traffic controller to which a message is sent.
European Supplement RealTimeStatusOfAirspace A RTSA message relates to the execution phase. It addresses an evaluation process performed at a specific time triggered by a specific event concerning the ARES status (activation, de-activation, modification) to match the existing plan (AUP / UUP) to the actual life performance. Identified delta will initiate a new plan. In addition it also addresses any change to existing plans (AUP / UUP) prior to their execution in real time, triggered by an event on the day of operation.
European Supplement ReadyMessage A message sent by ATC indicating to ETFMS that a flight can accept an improved CTOT. It can be sent from 15 minutes before EOBT until CTOT.
European Supplement ReadyForDeicingTime Time at which the aircraft is ready for deicing operation.
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.
European Supplement RBTRMTUpdate The update of the Reference Business or Mission Trajectory (RBT/RMT) is automatically triggered when the trajectory predictions periodically computed by the aircraft system, differ from the previously shared trajectory predictions more than the delta defined by ATC in Trajectory Management Requirements (TMR). The update of the RBT/RMT can also be triggered on request or periodically.
European Supplement RBTRMTRevision The revision of the Reference Business or Mission Trajectory (RBT/RMT/RMT) can be triggered at Controller, Flight Crew, FOC/WOC or Network Management Function initiative, when there is the need to change the 3D route and/or to amend altitude and/or time constraints. The revision process is completed by the acknowledgement by Flight Crew of the revised clearance.
European Supplement RateOfClimbOrDescentChange A change of rate of climb or descend during the execution of the Flight.
RatedAirTrafficController An air traffic controller holding a licence and valid ratings appropriate to the privileges to be exercised.
European Supplement RatedAirTrafficController An air traffic controller holding a licence and valid ratings appropriate to the privileges to be exercised.
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.
Ranked4DTrajectory A 4D trajectory proposed by airspace user or ASP as a potential agreed 4D trajectory.
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.
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.
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.
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.
RadioNavigationAid Any electronic system which provides information to be used by the pilot or aircraft navigation systems for position determination or flight path guidance.
RadioFrequencyArea A limitation, such as coverage, usability, etc., of a radio navigation aid or service frequency.
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.
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.
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.
RadioactiveCloud A radioactive particulate contaminated atmospheric area.
European Supplement PushBackInstructionRequest Pilot's request to ATC to obtain the push-back instruction.
European Supplement PushBackInstruction Directives issued by air traffic control for the purpose of requiring the push back.
European Supplement PushBackClearance Authorization for an aircraft to push-back under conditions specified by an air traffic control unit.
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.
ProtectedAirspace Airspace protected from specific air traffic.
European Supplement ProprietaryNationalNetwork Common National or sub-Regional infrastructure for data and digital voice (ATS-QSIG, VoIP).
European Supplement Propeller A mechanical device for propelling aircraft, consisting of a revolving shaft with two or more broad, angled blades attached to it.
ProhibitedArea An airspace of defined dimensions, above the land areas or territorial waters of a State, within which the flight of aircraft is prohibited.
ProceedDirectToPosition Instruction to proceed directly from its present position to the specified position.
ProcedureTransition A group of consecutive segments that are part of a branch on an approach procedure, SID or STAR.
European Supplement PRNAVProcedure A procedure that is designed to a common set of design principles specific to P-RNAV method of navigation.
European Supplement PRNAVClearance A clearance for executing a Precision Area Navigation Procedure.
PrimarySurveillanceRadar A surveillance radar system which uses reflected radio signals.
PreTacticalOperationalPlanning ATM activities aiming to accommodate demand, once initial schedules have been provided and permissions have been obtained.
European Supplement PreTacticalOperationalPlanning ATM activities aiming to accommodate demand, once initial schedules have been provided and permissions have been obtained.
European Supplement PretacticalATFMPhase An ATFM phase which takes place during six days prior to the day of operation and consists of planning and coordination activities.
PrescribedEETReportingPoint A point that has been prescribed for required Estimated Elapsed Time reporting.
PreliminaryFlightPlan A flight plan provided by the operator to obtain the FF-ICE Planning service.
PreFlightInformationBulletin A presentation of current NOTAM information of operational significance, prepared prior to flight.
PredictedGroundSpeed The computed ground speed at the trajectory point.
PredictedAirspeed The predicted indicated airspeed or Mach at the trajectory point.
European Supplement PrecisionTrajectoryClearance Ground-based separation mode. The objective is to authorize the execution of a segment of trajectory with the required precision. PTC may be in terms of 2D (lateral route portion only), 3D (lateral and vertical trajectory) or a 4D Contract in which the precision with which all 4 dimensions of flight are to be executed is described with high precision
PrecisionApproachRadarSystem A system comprising a precision approach radar and a surveillance radar element.
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.
PrecisionApproachProcedure Precision approach (PA) procedure. An instrument approach procedure using precision lateral and vertical guidance with minima as determined by the category of operation.
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.
European Supplement PracticalCapacity The number of aircraft operations during a specified time period corresponding to a tolerable level of average delay.
European Supplement PostOperationalAnalysis Final step in the ATFM planning and management process and takes place following the tactical phase of operations.
European Supplement PostFlight The ATM phase capturing the collaborative ATM activities concerning flights that have ended.
European Supplement PositionReport Information about the next reporting position and the corresponding time estimate.
PositionMarking Location on the movement area surface used for Air Traffic Control clearances. Position marking could be a painted marking or a sign.
European Supplement PositioningInformation Information related to the current positioning of the aircraft sent through the ADS-B.
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.
European Supplement PopulationDensity The geographically referenced density of population that embeds the area of interest. The intersection of the noise contours and population density provides the count of impacted population by noise level.
Polygon A surface or area described by a closed line.
European Supplement PoliceFlight A flight carried out by the police.
PointInSpaceReferencePoint Reference point for the point-in-space approach as identified by the latitude and longitude of the MAPt.
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.
Point The smallest unit of geometry which has no spatial extent. Points are described by two-dimensional (2D) or three-dimensional (3D) coordinates.
European Supplement PlannedTrajectory A time ordered sequence of predicted trajectory points representing the probable behaviour of a flight over area of interest to the stakeholder concerned.
European Supplement PlannedRoute A set of route points describing the horizontal path of a flight as planned by ATC.
European Supplement PIREP Direct observations of various weather conditions during flight, coded according to established formats and distributed via various channels.
European Supplement PilotRequest A specific pilot's request (route, departure and arrival airports, RFL, Estimated Off Block Time (EOBT) that may result in a constraint to apply on the flight once accepted by the controller.
European Supplement PilotInfrastructureObservationReport A report on an observation reported by the pilot about an inadequacy of a ground facility, the presence of birds around the aerodrome of destination, etc.
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.
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.
European Supplement 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.
PilotControlledLighting An indication that radio control of lighting is available to provide airborne control of lights by keying the aircraft's microphone.
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.
European Supplement PhaseFuelEfficiencyInput Information needed for assessment of the KPIs for fuel efficiency. This is information about number of movements and amount of fuel burn for the phase within a specific timeframe for a specific kind if airspace (LandingTake-Off, TerminalControlArea, En-Route). Derived from the number of movements and amount of fuel burn, the average fuel burn for each flight in the phase for the airspace kind is derived. The amount of fuel burn is derived from the fuel burn in related PhaseOfFlight.
Person A human being regarded as an individual.
European Supplement PermanentCapacity The permanent hourly capacity values for the period of the week within which it is applicable.
Period One-dimensional primitive representing an extent in time, a period is bounded by two different temporal positions.
PerformanceProfile A zero-wind, standard atmosphere profile reflective of the flight capabilities and desired parameters.
PassengerService The availability of passenger amenities and facilities at or in the vicinity of an aerodrome.
PassengerLoadingBridge A mechanically operated, adjustable ramp to provide direct passenger access between aircraft and buildings.
European Supplement PassengerFlow The embarkation and disembarkation of passengers.
PassengerAirService An air service performed primarily for the transport of passengers.
Passenger A person in or on a conveyance other than its driver, pilot, or crew.
European Supplement ParticulateMatter Particles with an aerodynamic diameter of 10 micrometres or less.
European Supplement PartialDelayApportionment The objective of delay absorption that the AMAN or EMAN sets to a given ATSU.
European Supplement ParkingConfiguration Grouping of non-overlapping aircraft parking positions: a single ParkingConfiguration defines a way to divide the stand's area into one or more non-overlapping parking positions.
European Supplement PACMessage An OLDI coordination message satisfying the following operational requirements: Notification and pre-departure coordination of a flight where the time of flight from departure to the COP is less than what would be required to comply with the agreed time parameters for ACT message transmission; Notification and pre-departure coordination of a flight by a local (aerodrome / approach control) unit to the next unit which takes control of the flight; Provide for acquisition of missing flight plan data in case of discrepancies in the initial distribution of flight plan data; Request the assignment of an SSR code from the unit to which the above notification is sent, if required.
OverPoint The event of flying over a significant point.
European Supplement OverMeteringFix The event of flying over a metering fix.
European Supplement Overload An occurrence when an air traffic controller reports that he/she has had to handle more traffic than they consider it was safe to do so.
European Supplement OverInitialMeteringFix The event of flying over an initial metering fix.
European Supplement OverInitialApproachFix The event of flying over an initial approach fix.
European Supplement OverDelivery An occurrence when the declared rate is exceeded by the actual number of aircraft that enter a regulated sector during a particular period.
European Supplement OverCoordinationPoint The event of flying over a coordination point allocated to the flight by the coordinating ATSUs.
European Supplement OTMVPlan The Occupancy Traffic Monitoring Values (OTMV) to be attributed to a Traffic Volume over a given period of time.
OrthometricHeight Height of a point related to the geoid, generally presented as an MSL elevation.
European Supplement OriginFlightDate The UTC scheduled date of departure of a flight. However, for a Multi-Leg Flight, the Origin Flight Date for each flight leg is the scheduled date of departure of the first Flight Leg in the series.
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.
European Supplement 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.
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.
OperatorPreferences A particular wish related to the planned trajectory.
European Supplement OperatorPreferences A particular wish related to the planned trajectory.
OperatorFlightPriority Indication of the relative priority of a flight within a group of flights for assignment of delays.
OperatorConstraint Operator procedures and other specific operator information that may impact manoeuvers and clearances which they are unable to accept from ATC.
OperatorConfiguration Aircraft configuration established by an aircraft operator for its fleet.
Operator A person, organization or enterprise engaged in or offering to engage in an aircraft operation.
OperationsSpecifications The authorizations, conditions and limitations associated with the air operator certificate and subject to the conditions in the operations manual.
OperationsManual A manual containing procedures, instructions and guidance for use by operational personnel in the execution of their duties.
European Supplement OperationHorizon A geometrical distance, flight time or set of points related to a Significant Point and used to define the geographical scope of an ATM operation. The point may, for example, be an Aerodrome Reference Point.
European Supplement OperationalPointUsage The usage of a point when describing the Air Traffic Operations.
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.
European Supplement 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.
OperationalFlightInformationService The automatic provision of integrated messages containing meteorological information, information concerning radio navigation services and aerodromes to aircraft in flight.
European Supplement OperationalDataset The system instance view of the current traffic building on the forecast dataset and integrating the prepared regulations and other tactical updates that is used operationally for tactical DCB.
European Supplement OperationalAirTraffic A flight which do not comply with the provisions stated for general air traffic and for which rules and procedures have been specified by appropriate national authorities.
European Supplement OpenLoopInstruction Open loop instructions are used by the Controller in time critical situations e.g. to ensure immediate separation of the aircraft versus conflicting They correspond to the case when no indication is given as to the duration or limit of the ATC vector instruction, nor how the aircraft will re-join its initial route (e.g. heading instruction).
European Supplement OnStandDeicing Deicing operation that takes place before the aircraft off-block from the departure stand.
European Supplement OLDIMessage A message used in coordination through ground-ground data link information exchange between ATC units in conformance with the OLDI Community Specification.
European Supplement OLDIBasicMessage A message used in coordination through ground-ground data link information exchange between ATC units in conformance with the OLDI Community Specification, chapter 6 Basic Procedure"."
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.
OFISMessage A message integrating, for the purposes of broadcasting, meteorological information, information concerning radio navigation services and aerodromes.
OffsetOfRoute Instruction to fly a parallel track to the cleared route at a displacement of the specified distance in the specified direction.
European Supplement Offset Linear displacement established parallel to a designated ATS route at a given distance and in a given direction from the centre line relative to the direction of flight.
OffBlockTime Time at which the aircraft departs from its parking position.
OffBlockReadyTime Time at which the aircraft is ready for Off-Block.
OffBlockReady Event at which all doors of an aircraft are closed and departure will be possible immediately after reception of the ATC clearance.
OffBlock The departure of the aircraft from its parking position.
European Supplement OffBlock The departure of the aircraft from its parking position.
European Supplement OceanicClearance The information associated with an oceanic clearance.
European Supplement OccupancyTrafficMonitoringValue A set of values (peak, sustain, overload duration, duration of counting) dedicated to monitor the instantaneous density of aircraft in a sector, as represented in occupancy counts.
European Supplement OccupancyCount The number of aircraft within a defined location in a given instant of time.
Obstruction The highest airspace, obstacle or terrain relative to a prescribed plane within a specified area.
ObstacleVisualAid Marking and/or lighting intended to reduce hazards to aircraft by indicating the presence of obstacles.
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.
European Supplement ObstacleDataInadequacy A particular inadequacy about an obstacle, such as missing information about a new obstacle seen during the flight.
European Supplement ObstacleData Obstacle data shall comprise the digital representation of the vertical and horizontal extent of the obstacle.
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.
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.
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.
ObstacleArea An area used for the purpose of collecting obstacle data, as necessary for air navigation systems or functions.
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.
ObservationReport Information concerning the evaluation of one or more meteorological elements.
Obscuration A weather phenomenon which reduces the visibility due to hydrometeor or lithometeor in suspension in the air.
European Supplement NumberOfMovements The number of identical operations.
European Supplement NumberAbove Number of events considered as source of noise.
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.
NOTAMService Provision of NOTAM service, as defined by ICAO Annex 15.
European Supplement NOTAMSeriesIdentifier The identifier of the document series, if applicable.
NOTAMCode A comprehensive description of information contained in NOTAM.
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.
European Supplement 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.
NoSpeedRestriction Notification that the aircraft may keep its preferred speed without restriction.
European Supplement NorthAtlanticTrack A route between Europe and North America whose exact location changes daily according to weather and traffic demands.
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.
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.
NonScheduledRevenueOperation Charter flight or special flight performed for remuneration other than scheduled flight.
NonScheduledOperation Any air service that is performed other than as a scheduled air service, including but not limited to charter operations.
NonScheduledInternationalFlight Any international flight performed other than as a scheduled international air service.
NonPrecisionApproachProcedure Non-precision approach (NPA) procedure. An instrument approach procedure which utilizes lateral guidance but does not utilize vertical guidance.
NonMovementArea Area where aircraft cannot be seen by a control tower and therefore are restricted to move.
NonAutomatedWeatherObservationSource Weather sources that tend to be manual in nature.
NonAutomatedWeatherObservationInstrument Non-Automated Weather Observation Instrument
European Supplement NonAircraftEmissionsInventory The inventory of the location and amount of the non-aircraft emissions including ground service equipment, airport service roads, car parks and roads, and buildings.
European Supplement NominalPreferredRoute Preferred user route in nominal conditions (e.g. meteorological).
European Supplement NoiseModel The noise model used to compute the noise levels as received within the area of interest.
European Supplement NoiseMetric The identified metrics for the assessment of Lden, SEL, NAx, Lamax.
European Supplement NoiseImpactSubjectOfAssessment The subject for the assessment are flights.
European Supplement NoiseImpactAssessmentOutput The output of the Noise impact Assessment is: The noise contours, by metric and threshold; The impacted population count.
European Supplement NoiseImpactAssessmentCriterion The criteria for the Noise Impact Assessment are: - The assessment area - The noise model - The meteorological observation - The population density
European Supplement NoiseImpactAssessment The noise impact assessment is the measurement of the impact of the air traffic on the receptors. The air traffic is provided by the NoiseImpactSubjectOfAssessment. It is modelled and assessed with the NoiseImpactAssessmentCriterion. The result is the NoiseImpactAssessmentOutput
European Supplement NoiseCapability The declared environmental noise impact of the aircraft.
European Supplement NMOCOriginatedSlotMessage A message involved in ATFCM slot allocation originated by NMOC
European Supplement NMOCDestinatedSlotMessage A message involved in ATFCM slot allocation destinated to NMOC
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.
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.
European Supplement 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.
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.
NetworkStation An aeronautical station forming part of a radiotelephony network.
European Supplement NetworkOperationsPlan A set of information and actions derived and reached collaboratively both relevant to, and serving as a reference for, the management of the Pan-European network in different timeframes for all ATM stakeholders, which includes, but is not limited to, targets, objectives, how to achieve them, anticipated impact. The NOP has a dynamic and rolling lifecycle starting in the planning phases and is progressively updated up to and including the execution and post-operations phases.
European Supplement NetworkManager The organization responsible for enabling the optimum use of airspace and ensure that Airspace Users can operate preferred trajectories while allowing maximum access to airspaces and air navigation services.
European Supplement NetworkManagementFunction An integrated ATM activity with the aim of ensuring optimised Network Operations and ATM service provision meeting the Network performance targets.
European Supplement NetworkManagement DCB activities and the traffic demand forecast and plan. It is also involved in the airspace management and crisis activities.
Negotiating4DTrajectory A 4D trajectory proposed by airspace user or ASP as a potential agreed 4D trajectory.
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.
NavigationAreaSector Subdivision of a sector to allow for different altitudes or gradients.
NavigationArea An area specified by sectors with altitude or procedure descent gradient limitations for omnidirectional departures or Pilot navigation area.
NavigationAidInfrastructure Space-based and or ground-based navigation aids available to meet the requirements in the navigation specification.
European Supplement NavaidInadequacy A particular inadequacy about a navaid, such as missing information about a navaid outage.
NauticalMile The length equal to 1 852 metres exactly.
NationalRegisteringAuthority The authority maintaining the national register or, where appropriate, the part thereof, in which aircraft are registered.
NationalityMark A nationality symbol included in the radio call signs allocated to the State of Registry by the International Telecommunication Union.
European Supplement MultiSwap Possibility for an AU to swap the same flight several times.
European Supplement MultilaterationSystem A group of equipment configured to provide position derived from the secondary surveillance radar (SSR) transponder signals (replies or squitters) primarily using time difference of arrival (TDOA) techniques. Additional information, including identification, can be extracted from the received signals.
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.
European Supplement MovementMessage Messages describing the intended or actual movement of aircraft based on the latest information furnished to ATS units by the pilot, the operator or its designated representative, or derived from ATS surveillance systems.
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).
MountainWave Atmospheric internal gravity waves, which are periodic changes of atmospheric pressure, temperature and orthometric height in a current of air.
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. "
European Supplement MostPenalisingRegulation The ATFM regulation giving the biggest contribution to the delay of a given flight.
European Supplement MorningCivilTwilight Begins in the morning when the centre of the sun's disc is 6 degrees below the horizon.
European Supplement MonotoringValue The agreed number of flights accepted to enter into a reference location per rolling hour beyond which coordinated actions may be considered between the concerned parties in order to better balance the traffic load.
European Supplement MonosensorTrack Captures the essence of a monosensor track
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.
European Supplement ModeSRadar A co-operative surveillance and communication system that has been designed as an evolutionary improvement to the existing SSR system. With a Mode S radar, only one scheduled surveillance interrogation and one reply are required on every antenna scan to accurately track the aircraft. Each aircraft reply has a unique 24 bit mode S address permanently associated with the aircraft.
Mist Suspension in the air of microscopic water droplets or wet hygroscopic particles which reduce the visibility at the Earth's surface.
European Supplement MissionTrajectory A trajectory enriched with other information that expresses the mission intentions of military and other airspace users. Mission Trajectory may additionally include specific airspace reservations when such airspace structure is needed.
European Supplement MissionDevelopmentTrajectory The trajectory initially planned by the military airspace user to be shared with the wider aviation community only once the corporate plans are sufficiently mature.
Mission Operation carried out by an aircraft or a group of aircraft used in military service.
European Supplement Mission Operation carried out by an aircraft or a group of aircraft used in military service.
MissedApproachProcedure The procedure to be followed if the approach cannot be continued.
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.
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.
MinutesInTrail A tactical ATFM measure expressed as the number of minutes required between successive aircraft.
European Supplement MinimumTurnaroundTime The minimum turn-round time agreed with an AO/GH (aircraft operator/ground handler) for a specified flight or aircraft type.
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.
MinimumObstacleClearanceAltitude The minimum altitude for a defined segment of flight that provides the required obstacle clearance.
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.
MinimumDescentHeight A specified height in a non-precision approach or circling approach below which descent must not be made without the required visual reference.
MinimumDescentAltitude A specified altitude in a non-precision approach or circling approach below which descent must not be made without the required visual reference.
European Supplement MinimumDepartureIntervals A tactical ATFM measure carried out when ATC sets a departure flow rate of, for example, 3 minutes between successive departures.
Minima Vertical and horizontal visual minima for a procedure segment conditions such as aircraft category, navigation equipment usage, procedure type, altimeter, etc.
European Supplement MilitaryVariableProfileArea A modular temporary airspace structure and reserved area introduced in order to enable sub-divisions, new areas or revised airspace requirements closer to air bases (60NM radius) and to define airspace scenarios to all geographical levels.
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.
European Supplement MilitaryRPASOperation Operation of the armed forces performed by an unmanned aerial vehicle.
European Supplement MilitaryFlightActivity Action or movement performed by an aircraft or a group of aircraft used in military service which may pose a threat to civil aircraft and which should be coordinated with ATS authorities.
MilitaryFlight Operations of the armed forces other than those for remuneration which should be covered under public transport operations.
European Supplement MilitaryAuthority The military authority designated by the State.
European Supplement MilitaryAirspaceUser Airspace User under the authority of a military organisation.
European Supplement MilitaryAircraftCallsign The aircraft callsign for a military aircraft.
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.
MicrowaveLandingSystem A precision approach and landing guidance system operating in the microwave spectrum, which provides position information and various ground-to-air data.
METREPORT Local report on routine observations for dissemination at the aerodrome of origin.
Metre The distance travelled by light in a vacuum during 1/299 792 458 of a second.
European Supplement MeteringHorizon The horizon where aircraft are given a target time for the Metering Point
European Supplement MeteringFixSequence The order in which two or more aircraft are planned to fly over an Metering Fix, i.e. the ordering by TTOM.
European Supplement MeteringFix A reference point over which traffic is metered, i.e measured and/or spaced in time.
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.
MeteorologicalReport A statement of observed meteorological conditions related to a specified time and location.
European Supplement MeteorologicalReport A statement of observed meteorological conditions related to a specified time and location.
MeteorologicalOffice An office designated to provide meteorological service for international air navigation.
MeteorologicalObservation The evaluation of one or more meteorological elements.
MeteorologicalForecast A statement of expected meteorological conditions for a specified time or period, and for a specified area or portion of airspace.
MeteorologicalAuthority The authority providing or arranging for the provision of meteorological service for international air navigation on behalf of a Contracting State.
METAR Aerodrome report on routine observations for dissemination beyond the aerodrome of origin.
Membership The nature of the membership of the agent.
European Supplement MediumTermPlanning The stakeholder specific period of time during which the operational activities are planned on a granularity of weeks and days.
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.
European Supplement MCDMCoordination Coordination, in the context of Measure Collaborative Decision Making, for an ATFM measure or an action on a flight.
European Supplement MaximumValue The maximum value of the sound level at time t during a period, using the slow setting.
MaximumTakeOffWeight The maximum weight at which the aircraft is certified for take-off due to structural or other limits.
MarkingBuoy A floating object moored to the bottom in a particular place, as an aid to navigation or for other specific purposes.
Marking A symbol or group of symbols displayed on the surface of the movement area in order to convey aeronautical information.
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.
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.
ManufacturerConfiguration Predefined aircraft configuration specified and delivered by the manufacturer of the aircraft or aircraft equipment(s).
ManualSurfaceWeatherObservation Manual Surface Weather Observation
European Supplement ManoeuvringAreaInadequacy A particular inadequacy about a manoeuvring area, such as missing information about a runway closure.
ManoeuvringArea That part of an aerodrome to be used for the take-off, landing and taxiing of aircraft, excluding aprons.
European Supplement ManagedAirspace Airspace in which all traffic and its intent is known to the Air Traffic System.
MaintainSpeedOrLess Instruction that the specified speed or a lesser speed is to be maintained.
MaintainSpeedOrGreater Instruction that the specified speed or a greater speed is to be maintained.
MaintainSpeed Instruction that the specified speed is to be maintained.
MaintainLevel Instruction to maintain the specified level.
European Supplement MACMessage An OLDI coordination message used to indicate to the receiving unit that the co-ordination or notification previously effected for a flight is being abrogated
Lumen The luminous flux emitted in a solid angle of 1 steradian by a point source having a uniform intensity of 1 candela.
European Supplement LTOTime The time spent by the aircraft during each LTO phase of the flight.
European Supplement LTOIndex The engine LTO indices are provided by the ICAO emissions databank, and can be reused for both en-route and LTO flight phases.
European Supplement LTOFuelFlowIndex The index for fuel flow for an engine for a specific LTO phase. Based on the ICAO Engine Exhaust Emissions Data Bank.
European Supplement LTOEmissionsIndex The index for emission of a specific gas from an engine for a specific LTO phase. Based on the ICAO Engine Exhaust Emissions Data Bank.
European Supplement LTOCycle The thrust settings to be used when making emissions and smoke measurements and the time to be used for each mode in the subsequent calculations of gaseous emissions.
European Supplement LowVisibilityRegulation An ATFCM measure implemented in case Low Visibility Operations require a minimum runway visual range.
European Supplement LowVisibilityProcedure A procedure applied at an aerodrome for the purpose of ensuring safe operations during Category II and III approaches and Low Visibility Take-offs.
European Supplement LowVisibilityConditions An occurrence at an aerodrome when the visibility is below a given threshold.
LowLevelWindShear Wind shear below 2000 feet AGL, exceeding 10 knots per 100 feet (vector difference between two points in space).
European Supplement LongTermPlanning The stakeholder specific period of time during which the operational activities are planned on a granularity of years and months.
LongitudinalSeparationMinima The minimum spacing between the estimated positions of the aircraft being separated. The spacing may be based on time or distance.
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.
European Supplement 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.
LocationIndicator A four-letter code group formulated in accordance with rules prescribed by ICAO and assigned to the location of an aeronautical fixed station.
Location An office or other premises at which the organization is located.
European Supplement LocalReport Local report message being routine or special.
European Supplement LocalOrSubRegionalNetworkManagement Set of DCB/dDCB, airspace management and crisis activities.
European Supplement LocalOrSubRegionalAirspaceManagement Set of airspace allocation activities for the airspace organization and management.
European Supplement LocalCapacityManagement Forecast and plan network resources and capabilities activities.
European Supplement LocalAirQualitySubjectOfAssessment The subject for advanced assessment of local air quality is a set of flight movements. In addition the number of movements, a comprehensive set of aspects related to flights are used as input for the analysis.
European Supplement LocalAirQualityAssessmentOutput The outputs of the advanced local air quality assessment are: - Aircraft emissions inventories - Airport emissions inventories - Airport emissions dispersion - Gaseous emissions - Particles emissions
European Supplement LocalAirQualityAssessmentCriterion The criteria for the local air quality assessment are: - The impacted area (meteorological observations, aerodrome characteristics, assessment grid) - The atmosphere model - The emissions model - The dispersion model - The emissions pollutants (gaseous, particles)
European Supplement LocalAirQualityAssessment The local air quality assessment identifies the environmental impact assessment for airport emissions: it is the set of proceedings to evaluate the fuel burn, the gaseous and particle emissions resulting from a set of flight movements.
Litre A unit of volume restricted to the measurement of liquids and gases which is equal to 1 cubic decimetre.
European Supplement LineUpInstruction Instruction to align the aircraft and runway longitudinal axes before take-off. The time when this instruction is provided is dependant on the departing sequence (synchronisation).
Line A connected sequence of points.
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.
LicensingAuthority The Authority designated by a Contracting State as responsible for the licensing of personnel.
European Supplement LicensingAuthority The Authority designated by a Contracting State as responsible for the licensing of personnel.
LevelOffTouchdown The phase of flight from the point of transition from nose-low to nose-up attitude, just before landing, until touchdown.
European Supplement LevelConstraint A constraint defined by an objective to set the cleared flight level for the flight. This constraint can be: - A Cleared Flight Level. The category is executive". - A Requested Flight Level. The category is "planning" - An En-route Cruise Level. The category is "flight_plan"."
LevelChange A change in level during the execution of the flight.
European Supplement LevelChange A change in level during the execution of the flight.
Level A generic term relating to the vertical position of an aircraft in flight and meaning variously, height, altitude or flight level.
European Supplement LetterOfAgreement Document defining coordination procedures to be applied between two Air Traffic Service Units when providing Air Traffic Control Services
LateralSeparationMinima The minimum distance (plus buffer) between intended routes of the aircraft being separated.
LateralConstraint A restriction brought to the lateral component of the trajectory of an aircraft.
European Supplement LateralConstraint A restriction brought to the lateral component of the trajectory of an aircraft.
LateralChange A change of course, track direction or heading during the execution of the flight.
LandingTime Time at which an aircraft touches down.
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.
European Supplement LandingSequence The order in which two or more aircraft are planned to land taking into account ATM constraints.
LandingRoll The phase of flight from touchdown until the aircraft exits the landing runway or comes to a stop, whichever occurs first.
European Supplement LandingRate The number of aircraft allowed to approach the Active Runway Configuration per hour, taking all operational constraints into account.
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.
European Supplement 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.
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.
LandingDistanceAvailable The length of runway which is declared available and suitable for the ground run of an aeroplane landing.
European Supplement LandingClearance Authorization for an aircraft to proceed with the landing at a certain arrival airport under conditions specified by an air traffic control unit.
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.
European Supplement 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.
Knot The speed equal to 1 nautical mile per hour.
Kilogram The unit of mass equal to the mass of the international prototype of the kilogram.
Kelvin A unit of thermodynamic temperature which is the fraction 1/273.16 of the thermodynamic temperature of the triple point of water.
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.
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.
IonosphericStorm Turbulence in the F region of the ionosphere, usually due to a sudden burst of radiation from the Sun.
Intersection A geographical location expressed as radials, bearings and/or distances from two radio navigation aids.
InternationalOperatingAgency An agency of the kind contemplated in Article 77 of the Convention.
InternationalNOTAMOffice An office designated by a State for the exchange of NOTAM internationally.
InternationalAirService An air service that passes through the airspace over the territory of more than one State.
IntermediateFix A fix that marks the end of an initial segment and the beginning of the intermediate segment.
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.
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.
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.
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.
InstrumentFlightRules A set of rules governing the conduct of flight under instrument meteorological conditions.
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.
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.
European Supplement InitialSharedMissionTrajectory The Shared Mission Trajectory which does not contain in step 1 all the necessary elements to enable the full implementation of Trajectory Based Operation that will be in use during step 2, among others ground routing is not an integrated part of the iSMT.
European Supplement InitialSharedBusinessTrajectory The Shared Business Trajectory which does not contain in step 1 all the necessary elements to enable the full implementation of Trajectory Based Operation that will be in use during step 2, among others ground routing is not an integrated part of the iSBT.
European Supplement InitialReferenceMissionTrajectory The Reference Mission Trajectory which does not contain in step 1 all the necessary elements to enable the full implementation of Trajectory Based Operation that will be in use during step 2, among others ground routing is not an integrated part of the iRMT.
European Supplement InitialReferenceBusinessTrajectory The Reference Business Trajectory which does not contain in step 1 all the necessary elements to enable the full implementation of Trajectory Based Operation that will be in use during step 2, among others ground routing is not an integrated part of the iRBT.
InitialPredictionPoint The initial point at which a prediction was made.
European Supplement InitialPredictionPoint The initial point at which a prediction was made.
European Supplement InitialMeteringHorizon The horizon where aircraft are given a target time for the Initial Metering Point
European Supplement InitialMeteringFixSequence The order in which two or more aircraft are planned to fly over an Initial Metering Fix, i.e. the ordering by TTOIM.
European Supplement InitialMeteringFix A point on a route at which flights can be pre-sequenced for an arrival-managed airport.
European Supplement InitialLandingSequence The order in which two or more aircraft are initially (i.e. without considering constraints) planned to land, i.e. the order by ELDT.
European Supplement InitialCondition Data typically transmitted by the aircraft concerning its current state (current position, current mass, etc) given as initial input to the Trajectory Predictor.
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.
InitialApproachFix A fix that marks the beginning of the initial segment and the end of the arrival segment, if applicable.
InfrastructurePointUsage The usage of a point when describing the Airspace or Base Infrastructure.
InfrastructurePoint A point used in describing the base or airspace infrastructure.
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.
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).
IndicatedAirspeed The uncorrected reading on the airspeed indicator.
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.
IncreaseSpeedToSpeed Instruction that the present speed is to be increased to the specified speed and maintained until further advised.
InCloudTurbulence Upper-atmospheric turbulence encountered by an aircraft when flying through a cloud.
European Supplement InboundClearance Authorization for an aircraft to proceed under conditions specified by an air traffic control unit. This clearance includes the STAR and Approach to be flown.
InBlockTime The time that an aircraft arrives in-blocks.
InBlock The arrival of the aircraft at its parking position.
European Supplement ImprovedOATFlightPlan A flight plan based on the ICAO 2012 FPL format, improved with initial Mission Trajectory data and harmonised military information items, managed centrally at European level and filed by military organisations operating IFR in European airspace.
Imbalance An occurrence when the traffic demand exceeds the available capacity.
ILSProtectionArea An area protecting ILS signal distortion by forbidding large objects in the area.
IFRFlight A flight conducted in accordance with the instrument flight rules.
European Supplement IFPLIdentifier A unique flight plan identifier allocated by the IFPS.
Icing Formation of ice, rime, or hoarfrost on an aircraft in flight.
IcePellets Precipitation of transparent particles of ice which are spherical or irregular, rarely conical, and which have a diameter of 5 mm or less.
IceCrystals Any one of a number of macroscopic crystalline forms of ice including hexagonal columns and platelets, dendritic crystals, ice needles and their combinations.
European Supplement ICAOFlightID Flight identification structure based on usual ICAO fields present in the Flight Plan.
European Supplement ICAOEngineType The ICAO engine type designator
ICAOAircraftTypeCode The ICAO designator of an aircraft type as published in ICAO doc 8643.
ICAOAircraftCategory Classification of aircraft according to specified basic characteristics, e.g. aeroplane, helicopter, glider, free balloon.
European Supplement IATAUniqueFlightIdentifier A composed key whose fields together define a unique IATA flight leg.
European Supplement IATALocationIdentifier A unique three-letter code assigned by IATA in order to identify an airport.
European Supplement IATAFlightNumber Number used in conjunction with the airline designator in order to build the flight designator.
European Supplement IATAAircraftTypeCode IATA code used to identify the aircraft type.
European Supplement HorizontalFlightEfficiencySubjectOfAssessment The subject for the assessment are flights.
European Supplement HorizontalFlightEfficiencyAssessmentOutput The output of the Horizontal Flight Efficiency Assessment is: - Great circle distance trajectory - Fuel burn efficiency - Gaseous emissions inefficiency - Distance inefficiency
European Supplement HorizontalFlightEfficiencyAssessmentCriterion A criterion for the Horizontal Flight Efficiency Assessment, such as: - The assessment area - The emissions model - The trajectory generator model - The meteorological observation - The emissions pollutants (gaseous and particles).
European Supplement HorizontalFlightEfficiencyAssessment A metric that compares the real trajectory and the great circle distance trajectory of the en-route part of flight, between the departure and arrival areas.
HoldingProcedure A predetermined manoeuvre which keeps an aircraft within a specified airspace while awaiting further clearance.
European Supplement HoldingProcedure A predetermined manoeuvre which keeps an aircraft within a specified airspace while awaiting further clearance.
HoldingFix A geographical location that serves as a reference for a holding procedure.
HoldingBay A defined area where aircraft can be held, or bypassed, to facilitate efficient surface movement of aircraft.
HoldingAssessment The geometry of surfaces that define altitude levels and the structure of an area used to evaluate obstacles for determining holding patterns.
European Supplement HoldingArea A defined area within which aircraft performs an en-route or approach holding.
European Supplement HoldExitPoint The point at which the flight is expected to exit from planned holding.
HoldExit The event of exiting from planned holding.
European Supplement HoldEntryPoint The point at which the flight is expected to enter into planned holding.
HoldEntry The event of entering into planned holding.
HoldAtPositionAsPublishedMaintainLevel Instruction to enter a holding pattern with the published characteristics at the specified position and level.
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.
European Supplement HighLevelAirspacePolicyBody The organization responsible for coordinating ARES with NM, creating ARES according to the VPA principle, associated route network and management rules of the ARES, and publishing ARES in national AIP.
HighFrequencyDataLink 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.
Hertz The frequency of a periodic phenomenon of which the period is 1 second.
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.
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.
European Supplement 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.
Helideck A heliport located on an offshore structure such as an exploration or production platform used for the exploitation of oil or gas.
HelicopterGroundTaxiwayAndTaxiRoute A ground taxiway and taxi route intended for the ground movement of wheeled undercarriage helicopters.
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.
HelicopterAirTaxiwayAndTaxiRoute A defined path on the surface established for the air taxiing of helicopters.
Height The vertical distance of a level, a point or an object considered as a point, measured from a specified datum.
European Supplement HeadingChange A change of heading during the execution of the Flight.
Heading The direction in which the longitudinal axis of an aircraft is pointed, usually expressed in degrees from North (true, magnetic, compass or grid).
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.
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.
European Supplement HandlingAgent Ground Handler: A Ground Handler is the company or person(s) that perform ground handling.
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.
GuidanceLine A line used to guide aircraft on and between airport movement areas.
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.
European Supplement GroundSystemTrajectory A trajectory calculated by a ground system.
GroundStop A tactical ATFM measure where some selected aircraft remain on the ground.
GroundLightSystem One or more light sources located on the ground that provide visual assistance for air and ground navigation.
GroundHandling Services necessary for an aircraft's arrival at, and departure from, an airport, other than air traffic services.
European Supplement GroundHandling Services necessary for an aircraft's arrival at, and departure from, an airport, other than air traffic services.
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.
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.
GroundBasedFix A specified geographical location used in describing the base or airspace infrastructure, which is found by reference to radio navigation aids.
European Supplement GroundAgreedTrajectory A trajectory used by the ground systems when the trajectory has already been amended in the ground system but does not yet have been proposed to the Flight Crew.
European Supplement GridCell An evaluation structure for the elevated points that comprise the dataset.
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).
GlobalNavigationSatelliteSystem 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.
GloballyUniqueFlightIdentifier A single reference for FF-ICE information pertinent to a flight that is unique globally.
GlidePath A descent profile determined for vertical guidance during a final approach.
European Supplement GlidePath A descent profile determined for vertical guidance during a final approach.
Geometry Geometry constructs used to describe the physical shape of entities.
GeometricalTaxiRoute Geometrical representation of TaxiRoute". The geometrical route consists of Nodes and Edges."
GeomagneticActivity Disturbances in the geomagnetic field caused by gusts in the solar wind that blows by the Earth.
GeneralAviationOperation An aircraft operation other than a commercial air transport operation or an aerial work operation.
European Supplement GeneralAirTraffic A flight conducted in accordance with the rules and procedures of ICAO.
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.
Gate Access to an airport terminal on the passenger side.
European Supplement GaseousEmission The amount of emissions of a specific gaseous substance.
Gangway A variable-sloped pedestrian walkway that links a fixed structure or land with a floating structure.
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.
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.
G-SIGMET A graphical SIGMET report.
G-AIRMET A graphical AIRMET report.
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.
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.
European Supplement FrozenHorizon The horizon within which no automatic swapping of flights in the sequence, and no update of landing time will occur.
European Supplement FromVFRtoIFRPoint A trajectory point at which the flight passes from VFR to IFR rules, indicating the end of VFR portion of the route.
European Supplement FromVFRtoIFR A change of Flight Rules from VFR to IFR during the execution of the Flight.
European Supplement FromOATtoGATPoint A trajectory point at which the flight passes from OAT to GAT rules, indicating the end of a military portion of the route.
European Supplement FromOATtoGAT A change of flight type from OAT to GAT during the execution of the Flight.
European Supplement FromIFRtoVFRPoint A trajectory point at which the flight passes from IFR to VFR rules, indicating the start of a VFR portion of the route.
European Supplement FromIFRtoVFR A change of Flight Rules from IFR to VFR during the execution of the Flight.
European Supplement FromGATtoOATPoint A trajectory point at which the flight passes from GAT to OAT rules, indicating the start of a military portion of the route.
European Supplement FromGATtoOAT A change of flight type from GAT to OAT during the execution of the Flight.
European Supplement FrequencyChangeInstruction Instruction issued by air traffic control to the flight crew for the purpose of transferring control from one control unit or control position to the next.
FreeTextEmergencyMessage Generic message applicable in all situations when no standardised emergency of AIDC message can be applied.
European Supplement FreeRoutingAirspace Airspace defined laterally and vertically, allowing Free routing with a set of entry/exit features. Within this airspace, flights remain subject to air traffic control.
European Supplement FreeRouting The ability of an Airspace User to plan/re-plan a route according to the User defined segments.
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.
FormalOrganisation An organisation which is recognized in the world at large, in particular in legal jurisdiction, with associated rights and responsibilities
European Supplement FormalOrganisation An organisation which is recognized in the world at large, in particular in legal jurisdiction, with associated rights and responsibilities
European Supplement ForecastDemand Demand estimated from initial information, such as schedules, and/or historical data.
European Supplement ForecastDataset A system instance view of the predicted traffic, including repetitive flights, taking into account wind predictions, North Atlantic Track traffic predictions, airport slots, airline schedules and the traffic from a similar day in the past.
Forecast A statement of expected meteorological conditions for a specified time or period, and for a specified area or portion of airspace.
Foot The length equal to 0.304 8 metre exactly.
Fog A suspension of very small, usually microscopic water droplets in the air, reducing visibility at the Earth's surface.
European Supplement FMSTrajectory The aircraft predicted path, including time predictions at relevant location, computed by the FMS and constantly updated with the aircraft position (by reference to available navigation aids) and with pilot entries.
European Supplement FlyTrack Instruction to fly on the specified track.
FlyoverWaypoint A waypoint at which a turn is initiated in order to join the next segment of a route or procedure.
FlyHeading Instruction to fly on the specified heading.
FlyByWaypoint A waypoint which requires turn anticipation to allow tangential interception of the next segment of a route or procedure.
European Supplement FlowManagementPosition A working position established in appropriate air traffic control units to ensure the necessary interface between local ATFCM partners (i.e. ATCs, AOs and Airports) and a central management unit on matters concerning the provision of the air traffic flow and capacity management service.
European Supplement FlowElement A location being either an aerodrome, a set of aerodromes, an airspace or a significant point.
European Supplement Flow A pattern of traffic catching flights by origin, destination and crossings.
FloatingDockSite Floating facility which can serve as a mooring place for vessels or as a floating dry dock.
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."
European Supplement FligthObjectManagementRole A role played by an Agent in relation to information exchange using the Flight Object.
European Supplement FligthDataUser A Flight Object Management role that has the following responsibilities: - Subscribes the FO - Receives the updates of the FO
European Supplement FlightUpdateMessage Message sent by the Network Operations which supplies airports of destination with an Estimated Landing Time (ELDT). In addition to the ELDT, the FUM contains the last point in the flight plan route with the corresponding Estimated Time Over (ETO) and also a flight status. A FUM is sent for the first time at 3 hours before the ELDT. FUM updates will be sent each time a significant update of the flight occurs in ETFMS. It contains the most recent information known to the Network Operations, based upon its own flight profile calculation, flight data and radar position updates received from ATC and DPI messages concerning the flight if it is not yet airborne.
European Supplement FlightTypeChange A change of flight type during the execution of the Flight.
European Supplement FlightSuspensionMessage A message sent by the network manager suspending a flight, which thereafter should not get take-off clearance.
European Supplement FlightSuspension An action performed on a flight as a result of an ATFM Measure
FlightStatus An indication of whether a given aircraft requires special handling by air traffic services units or not.
European Supplement FlightSequence A set of flights ordered by the planned actual time of an event.
European Supplement FlightScript The flight data required as the input to the local 4D IOP trajectory prediction process; it contains the starting conditions for the trajectory calculation (e.g. 4D aircraft position), the 2D route, and the set of constraints that the flight must comply with; it also contains the coordination data agreed/in negotiation between two ATC Systems.
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.
FlightRulesChange A change in flight rules during the execution of the flight.
FlightRules The regulations that govern all aspects of operations under which the pilot flies.
FlightRoutingElement An airspace, route or point that is concerned by a specified flight restriction.
FlightRoute The path of a flight over the surface of the earth, including also altitude and speed information.
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.
FlightRestrictionLevel A single level or a level band associated with a flight restriction, either condition or routing element.
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.
European Supplement FlightPriority The priority of the flight inside the Airspace. Priority is established through the UDPP (User Driven Prioritization Process). This priority shall exist mainly when there is an imbalance between the demand for using the airspace and the control capacity available for the airspace.
European Supplement FlightPlanning The ATM phase capturing the collaborative ATM activities that typically occurring prior to the day of operations. From a Trajectory perspective, this phase is marked by the use of the Shared Business Trajectory to communicated intended flight operations.
European Supplement FlightPlannedRoute The description of the trajectory of a flight as filed in a flight plan.
FlightPlan Specified information provided to air traffic services units, relative to an intended flight or portion of a flight of an aircraft.
European Supplement FlightPlan Specified information provided to air traffic services units, relative to an intended flight or portion of a flight of an aircraft.
European Supplement FlightPhaseEfficiencyAssessment Assessment of the fuel efficiency for a specific flight phase.
European Supplement FlightPhaseEfficiency Environmental related information for a specific phase of a flight. Different interpretations of phase exists. From the environmental point of view, phases are defined to include pre-flight and post-flight parts of a flight. This is needed to capture fuel burn, gaseous emissions and noise from the auxiliary power unit while aircraft is at stand.
FlightPhase A period-in-time occurrence during a Flight.
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.
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.
European Supplement FlightObjectDataset The system instance view of a flight, shared between the IOP stakeholders. Conceptually the Flight Object is intended to hold all ATM related flight data pertaining to individual flights that needs to be shared between any interested stakeholders.
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.
European Supplement FlightManagementSystem 1. An integrated system, consisting of an airborne sensor, receiver and computer with both navigation and aircraft performance databases, which provides performance and RNAV guidance to a display and automatic flight control system. 2. An on-board multi-purpose navigation, performance, and aircraft operations computer designed to provide virtual data and operational harmony between closed and open elements associated with a flight from pre-engine start and take-off, to landing and engine shut-down.
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.
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."
European Supplement FlightIntent The flight data used as the basis for planning by various ATM roles that describes the operational requirements and constraints that need to be respected by the trajectory.
FlightInformationService A service provided for the purpose of giving advice and information useful for the safe and efficient conduct of flights.
FlightInformationRegion An airspace of defined dimensions within which flight information service and alerting service are provided.
European Supplement FlightInformationRegion An airspace of defined dimensions within which flight information service and alerting service are provided.
FlightInformationCentre A unit established to provide flight information service and alerting service.
European Supplement FlightExecution The ATM phase capturing the collaborative ATM activities that typically occurring on the day of operations. From a Trajectory perspective, this is marked by the use of the reference Business Trajectory.
FlightEvent An event happening to a given flight.
European Supplement FlightEnvelope The range of airspeeds, altitudes and normal load factors at which the aircraft can (safely) operate.
European Supplement FlightDesignatorSuffix Complementary character used to distinguish between two flights with the same IATA flight number and airline designator.
European Supplement FlightDesignator Identifier of one or several consecutive IATA flight leg(s) operated by an airline.
FlightDeck Term encompassing the flight crew and/or aircraft systems.
European Supplement FlightDeck Term encompassing the flight crew and/or aircraft systems.
European Supplement FlightDataManagerPublisher A Flight Object Management role that has the following responsibilities: - Collects operationally agreed changes on one or more subset (Topic) of Flight Object from contributors. - Updates the value of the changed Topics of Flight Object, being responsible for the consistency of Flight Object Publishes the Flight Object to the subscribed partners Entitlement to hold the reference value of the Flight Object, and responsibility for publishing this reference value as the FO. The agent in this role is typically the agent operationally responsible for the flight
European Supplement FlightDataContributor A Flight Object Management role that has the following responsibilities: - Locally sets the value to a subset of the information constituting the Flight Object. - Sends the proposed update of the topic, deriving from operationally agreed changes (constraints, orders, messages,), to the concerned Flight Data Manager Publisher for partial contribution.. Agents in this role are typically ATSUs that will or may be affected by the flight in question in the future.
FlightCrewMember A licensed crew member charged with duties essential to the operation of an aircraft during a flight duty period.
FlightCrewApplicationAndApproval Equipment and procedures for which the air crew is qualified.
European Supplement FlightControlUnit A unit that allows for the selection and parameter setting of the different autoflight functions.
European Supplement FlightConfirmationMessage A message to be sent to the network manager confirming the operation of the flight or announcing the Runway Visual Range (RVR) value.
FlightConfiguration Configuration of aircraft in operation.
European Supplement FlightConfiguration Configuration of aircraft in operation.
FlightConditionElement An operand in a flight condition combination.
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."
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.
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.
European Supplement 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.
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.
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.
FireFightingService An airport service that provides rescue and fire fighting capabilities for aircraft in emergency at and around the airport.
European Supplement FIRBoundaryCrossingPoint The point at which the trajectory crosses from one FIR into another.
FIRBoundaryCrossing The event of crossing from one FIR into another.
European Supplement FinalArrivalSeparationAdvice In the context of final arrival sequence, the advice to ensure additional spacing required between each arrival pair taking into account their respective landing stabilisation speed profile intentions or characteristics.
European Supplement FinalArrivalSafetyMitigationAdvice In the context of final arrival sequence, the advice for safety mitigation.
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.
FinalApproachSegment That segment of an instrument approach procedure in which alignment and descent for landing are accomplished.
FinalApproachFix That fix or point of an instrument approach procedure where the final approach segment commences.
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.
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.
European Supplement FiledTacticalFlightModel A mathematical model containing a point and airspace volume profile for a flight when Flight plan details, and any subsequent changes, are received from Network Operations.
FiledFlightPlan The flight plan as filed with an ATS unit by the pilot or a designated representative, without any subsequent changes.
European Supplement FiledFlightPlan The flight plan as filed with an ATS unit by the pilot or a designated representative, without any subsequent changes.
Filed4DTrajectory The 4D trajectory filed by the FF-ICE enabled airspace user (eAU) with the FF-ICE enabled Air Traffic Management Service Providers (eASP).
European Supplement FieldConditionInadequacyAtDestination A possible inadequacy of some field conditions at destination.
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.
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.
European Supplement 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.
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.
European Supplement FacilityForHandicappedPersonService Facilities available at the airport for handicapped persons.
European Supplement ExtendedProjectedProfileReport The list of aircraft parameters transmitted by the aircraft, including the FMS trajectory expressed as a sequence of trajectory points with constraints and estimates, and other parameters such as the gross mass, the min/max speed schedule.
European Supplement ExtendedFlightPlan An extension of the (ICAO) Flight Plan that contains also flight trajectory information in the form of a 4D Profile, as calculated by the operator of the flight, as well as Performance Data specific to the flight.
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.
European Supplement ExpectedStandWaitingPeriod The planned delay waiting on the aircraft stand.
European Supplement ExpectedRunwayWaitingPeriod The planned delay at the runway holding point.
European Supplement ExpectedRunwayDelayBuffer The buffer of delay planned at runway hold to maintain pressure on runway.
ExitIntoConstrainedAirspace The event of exiting from designated constrained airspace.
ExitFromRestrictedORReservedAirspace The event of exiting from an airspace restriction/reservation.
European Supplement ExitFromRestrictedORReservedAirspace The event of exiting from an airspace restriction/reservation.
European Supplement ExitFromConstrainedAirspacePoint The point at which the trajectory is projected to exit from designated constrained airspace.
Executed4DTrajectory The actual 4D trajectory of the aircraft from the start-up to the present position.
European Supplement Executed4DTrajectory The actual 4D trajectory of the aircraft from the start-up to the present position.
European Supplement ExceptionalCondition A mechanism whereby the regulation also applies to traffic that is usually exempted.
Event An action which occurs at an Instant.
European Supplement EveningCivilTwilight Civil twilight ends in the evening when the centre of the sun's disc is 6 degrees below the horizon.
European Supplement EuropeanUpdatedAirspaceUsePlan An UUP published by Network Operations to update and supersede E-AUP/previous E-UUP information.
European Supplement EuropeanNetworkManager The Network Manager acts as catalyst and facilitator for an efficient overall network management by all ATM stakeholders. The Network Manager role will be enabling, facilitating and promoting the Network Operations Plan, providing a framework to allow Local/Sub-regional Network Manager and Airspace Users actors to share information (Network View), to coordinate (CDM) and to prepare scenarios to be used at network level when necessary.
European Supplement EuropeanATMNetwork The collection of systems listed in Annex I to Regulation (EC) No 552/2004 of the European Parliament and of the Council of 10 March 2004 on the interoperability of the European air traffic management network (the interoperability Regulation) (2) enabling air navigation services in the Community to be provided, including the interfaces at boundaries with third countries
European Supplement EuropeanAispaceUsePlan An AUP published by Network Operations daily at 17:00 local and disseminated for operators for flight planning purpose. It contains information on availability of CDR1 and CDR2 routes for a 24-hour period.
European Supplement ETAMinMaxPeriodicDemand Ground request to the aircraft system to get the ETA min / max for the provided Fix point with periodic updates. This represents the ADS-C ETA Minimum Maximum Periodic message
European Supplement ETAMinMaxDemand Ground request to the aircraft system to get the ETA min / max for the provided Fix point. This represents the ADS-C ETA Minimum Maximum Demand message
European Supplement ETAMinMax Earliest/latest Estimated Time of Arrival at a waypoint, provided the aircraft flies the 4D Trajectory at its max/min allowable speed. Wind/temperature error is also taken into account, in order to guarantee that any CTA defined within associated ETA min/max interval will be satisfied with high probability.
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.
European Supplement EstimatedTurnaroundTime The time estimated by the AO/GH (aircraft operator/ground handler) on the day of operation to turn-round a flight taking into account the operational constraints.
EstimatedTimeOver The time at which it is estimated that the flight will pass a point on its intended trajectory.
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.
European Supplement EstimatedTaxiTimeToRemoteDeicing The estimated time to taxi from departure stand to the de-icing stand at which remote de-icing takes place.
European Supplement EstimatedTaxiOutTime The estimated taxi time between off-block and take-off. This estimate includes any delay buffer time at the holding point or remote deicing prior to take-off.
European Supplement EstimatedTaxiInTime The estimated taxi time between landing and in-block.
EstimatedTakeOffWeight The estimated takeoff weight of the aircraft.
EstimatedTakeOffTime The estimated take-off time taking into account the Estimated Off-Block Time plus the Estimated Taxi-Out Time.
European Supplement EstimatedReadyForDeicingTime The estimated time when the aircraft is expected to be ready for de-icing operations.
European Supplement EstimatedOutboundTaxiTime The expected taxi period from Off-Block to Runway Holding Point, with no buffer or delay.
EstimatedOffBlockTime The estimated time at which the aircraft will commence movement associated with departure.
EstimatedLandingTime The estimated time that an aircraft will land.
EstimatedInBlockTime The estimated time that an aircraft will arrive in-block.
EstimatedEndOfDeicingTime The estimated time when de-icing operations on an aircraft are expected to end.
EstimatedElapsedTimeReporting The reporting of the estimated elapsed time.
EstimatedElapsedTime The estimated time required to proceed from one significant point to another.
EstimatedDeicingTime Time difference between the Estimated End of De-icing Time (EEZT) minus the Estimated Commencement of De-icing Time (ECZT).
EstimatedCommencementOfDeicingTime The estimated time when de-icing operations on an aircraft are expected to start.
European Supplement Equipment833Restriction The 8.33 restricted level band information relevant for an airspace when it includes 8.33 restricted airspace. Separation between radio frequencies is minor and therefore only they can be crossed by planes equipped with radios that they support.
EntryIntoConstrainedAirspace The event of crossing into designated constrained airspace.
EntryIntoAnRestrictedOrReservedAirspace The event of entering an airspace restriction/reservation.
European Supplement EntryIntoAnRestrictedOrReservedAirspace The event of entering an airspace restriction/reservation.
European Supplement EntryCount The number of aircraft requesting to enter in a Reference Location in a given time period.
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.
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.
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.
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.
European Supplement EngineRegime The engine regime (throttle position) of an aircraft.
European Supplement EngineOperationMode Modes of operations for engine thrust settings
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).
European Supplement 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).
European Supplement EndStayPoint The point at which the flight is expected to terminate an operation at which it remained for some time.
EndStay The termination of an operation at which the flight remained for some time.
EndPredictionPoint The final point at which a prediction was made.
European Supplement EndPredictionPoint The final point at which a prediction was made.
European Supplement EndOfLandingRollPoint The point at which the aircraft is predicted to come to a full stop on the arrival runway.
EndOfLandingRoll The event of coming to a full stop on the arrival runway.
EndOfExpectVectors The end of the vectoring, when procedures specify Expect Vectors"."
EndDeicingTime Time at which the deicing operation ends.
European Supplement EndDeboardingTime The time when disembarkation from an aircraft ends.
European Supplement EmissionsModel The model used for calculations of emissions based on the fuel burn. The model is the set of tools and methods that enable to compute an aircraft emissions impact assessment. It models the subject of assessment (the traffic), includes the assessment criteria and generates the emissions indicators to be used within the required metrics.
European Supplement EmissionCapability The declared environmental emissions impact of the aircraft.
EmergencyPhase A generic term meaning, as the case may be, uncertainty phase, alert phase or distress phase.
EmergencyMessage Message used during emergency phases as per ICAO Annex 12, or other emergency (such as radio communications failure, unlawful interference or passenger illness).
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.
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.
European Supplement 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.
European Supplement EligibilityHorizon The boundary of the airspace within which Arrival Management receives flight progress information for every aircraft bound for the arrival managed airport.
Elevation The vertical distance of a point or a level, on or affixed to the surface of the earth, measured from mean sea level.
ElevatedHeliport A heliport located on a raised structure on land.
European Supplement ElectronicAIP The AIP, AIP Amendment, AIP Supplement and AIC published in a format that allows for displaying on a computer screen and printing on paper.
European Supplement EarlyDeparturePlanningInformation Departure Planning Information message which notifies the ETOT 2 to 3 hours before off-block time. The main purpose of the E-DPI is to confirm that the flight is going to occur, thus eliminating ghost and duplicated flights. Before an E-DPI is sent, it is required that the Airport CDM Platform matches the flight plan and airport slot.
European Supplement DynamicMobileAreaType3 An area with defined lateral and vertical dimensions around moving activities requiring extra lateral and vertical separation from other trajectories.
European Supplement DynamicMobileAreaType2 An area with defined lateral, vertical dimensions and time frame allocations needs at variable geographic location along a defined trajectory.
European Supplement DynamicMobileAreaType1 An area with defined with lateral and vertical dimensions and time frame allocation needs at variable geographic location negotiated through CDM process.
European Supplement DynamicMobileArea A temporary mobile airspace exclusion area which aims to minimise the impact on the network while satisfying the needs of military airspace users.
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.
DustStorm An ensemble of particles of dust energetically lifted to great heights by a strong and turbulent wind.
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.
Duration Lasting, continuance in time; the continuance or length of time; the time during which a thing, action, or state continues.
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.
DomesticAirService An air service operated wholly within the territory of a State.
Document A piece of written, printed, or electronic matter that provides information or evidence or that serves as an official record.
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.
DME Ultra High Frequency (UHF) ground equipment that is used in conjunction with airborne equipment to determine distance between the airborne and ground equipment.
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.
European Supplement DispersionModel The dispersion model used to compute the geo-referenced evolution of the pollutants, on a time base, in the assessed area. A dispersion model is used for a mathematical simulation of how air pollutants disperse in the ambient atmosphere.
Disembarkation The leaving of an aircraft after a landing, except by crew or passengers continuing on the next stage of the same through-flight.
European Supplement Disembarkation The leaving of an aircraft after a landing, except by crew or passengers continuing on the next stage of the same through-flight.
European Supplement DirectRoutingAirspace Airspace defined laterally and vertically with a set of entry/exit conditions where published direct routings are available within this airspace, flights remain subject to air traffic control.
European Supplement DirectRouting A published segment of a great circle between two published waypoints.
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.
DirectFlightSegment A direct flight (DCT) between two specified significant points.
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.
European Supplement DeSuspensionMessage A message sent by ETFMS to a suspended flight when the reason for a suspension no longer applies and the flight is not regulated.
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.
European Supplement 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.
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.
European Supplement 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.
European Supplement DescentPerformanceProfile The optimum and unconstrained descending capability of the aircraft.
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.
European Supplement DescentClearance Authorization for an aircraft to proceed with the descent under conditions specified by an air traffic control unit.
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.
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.
DescendToLevel Instruction that a descent to a specified level is to commence and once reached the specified level is to be maintained.
DescendAtVerticalRateMinimum Instruction to descend at not less than the specified rate.
DescendAtVerticalRateMaximum Instruction to descend at not above the specified rate.
European Supplement DepartureSuspension The action through which a flight departure is suspended either by the AO (e.g. when the aircraft meets a severe technical problem) or by the APOP for any reason.
DepartureSurfaceSegment This segment describes the elements of the overall trajectory from the departure gate up to and including the departure runway.
European Supplement DepartureSequence An ordered set of departures.
European Supplement DepartureRunwayOccupancyTime The time interval between the aircraft crossing the stop bar at the holding point and the main gear lift-off from the runway.
European Supplement DepartureRunwayOccupancyPhase The phase of flight between the aircraft crossing the stop bar at the holding point and the main gear lift-off from the runway.
European Supplement DepartureReferenceTimeReordering Substitution between the reference time within a pre-departure sequence of two or more flights resulting in a reduced delay for some flights at the expense of an increased delay for the others.
European Supplement DeparturePlanningInformation Message which supplies the Network Operations with flight data related updates. The DPI messages contain accurate Estimated Take-Off Times (ETOT), Target Take-Off Times (TTOT), Taxi Times and Standard Instrument Departures (SID) information. Subsequent DPI messages work as updates to previously sent information, containing progressively more accurate information. The automated transmission of the DPI messages is triggered by system events derived from the Milestone Approach processes at the airport. Each DPI message relates to a single flight only. The Network Operations processes the DPI messages received and if necessary, the CTOT is re-calculated (improved or deteriorated). A Flight Update Message (FUM, see below) is sent by the Network Operations to the flight's next destination airport.
DepartureOperations The set of flight operations following procedures associated with the departure aerodrome.
European Supplement DepartureOperations The set of flight operations following procedures associated with the departure aerodrome.
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.
European Supplement DepartureManagementTool A tool for managing departure operations.
DepartureClearance Authorization for an aircraft to take-off under conditions specified by an air traffic control unit.
DepartureAirportSlotTime The time of the Airport Departure Slot as allocated by the Airport Slot Coordinator
Demand The number of aircraft requesting to use the ATM system in a given time period.
European Supplement Demand The number of aircraft requesting to use the ATM system in a given time period.
European Supplement DeltaEmission The change in noise and gaseous emissions measured at a given waypoint.
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.
European Supplement DelayApportionment The apportionment of an AMAN or EMAN delay.
DeicingTime Duration of the deicing operation.
DeicingGroup A group of deicing areas.
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.
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).
European Supplement 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).
DegreeCelsius The special name for the unit kelvin for use in stating values of Celsius temperature.
European Supplement DefaultCapacity The default capacity value is given for one hour not specifying a period. It applies when there is no permanent or temporary values defined for a particular period.
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.
European Supplement 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.
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.
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.
European Supplement DayEveningNightLevel A (Leq-based) noise index adopted by the European Commission which weights evening noise by 5dB and night-time noise by 10dB.
DatumCrossingPoint The DCP is a point on the glide path directly above the LTP or FTP at a height specified by the RDH.
DateTime A DateTime is a combination of a date and a time type.
Date A date gives values for year, month and day.
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.
DataLinkVOLMETService The provision of VOLMET via DataLink.
European Supplement DataLinkGroundInfrastructure The ground segment of the A/G datalink infrastructure supporting both ACARS and ATN.
European Supplement DataLinkCapability Notification provided from flight deck to the first ANSP including connection details and aircraft capabilities for data link connection (e.g. CPDLC, ADS-C, FIS / D-OTIS via ATN).
DataLinkAutomaticTerminalInformationService The provision of ATIS via data link.
DangerArea An airspace of defined dimensions within which activities dangerous to the flight of aircraft may exist at specified times.
European Supplement CurrentTacticalFlightModel A mathematical model containing a point profile and airspace volume profile for a flight which has been activated. (Called Actual Profile on CHMI.)
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.
European Supplement 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.
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.
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.
European Supplement CTAInstruction An ATC instruction requiring the pilot to meet a CTA constraint.
European Supplement CTACancellationInstruction An ATC instruction requiring the pilot to cancel a CTA constraint.
CruisingSpeed A true air speed maintained during a significant portion of a flight.
CruisingLevel A level maintained during a significant portion of a flight.
European Supplement CruisingLevel Flight level at which an aircraft flies during the cruise phase.
European Supplement CruisingAltitude Altitude at which an aircraft flies during the cruise phase.
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.
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.
CruiseClimbSpeed The true airspeed to be maintained during cruise climb.
CruiseClimb An aeroplane cruising technique resulting in a net increase in altitude as the aeroplane mass decreases.
CrossPositionBetweenTimeAndTime Instruction that the specified position is to be crossed at a time between the specified times.
CrossPositionBetweenLevelAndLevel Instruction that the specified position is to be crossed at a level between the specified levels.
CrossPositionAtTime Instruction that the specified position is to be crossed at the specified time.
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.
CrossPositionAtOrBelowLevel Instruction that the specified position is to be crossed at or below the specified level.
CrossPositionAtOrBeforeTime Instruction that the specified position is to be crossed at or before the specified time.
CrossPositionAtOrAfterTime Instruction that the specified position is to be crossed at or after the specified time.
CrossPositionAtOrAboveLevel Instruction that the specified position is to be crossed at or above the specified level.
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.
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.
CrossPositionAtAndMaintainLevel Instruction that the specified position is to be crossed at the specified level and that level is to be maintained when reached.
CrossOverAltitudePoint The point in climb or descent where the airplane will transition between Mach and IAS control.
European Supplement CrossoverAltitudePoint The point in climb or descent where the aircraft will transition between Mach and IAS control.
European Supplement CrossingIntoConstrainedAirspacePoint The point at which the trajectory is projected to cross into a constrained airspace.
CrossBorderService An international shorthaul air service operating across the borders of two contiguous States.
CrossBorderArea Airspace of defined dimensions, above the land areas or territorial waters of more than one state.
European Supplement CriticalEvent An unusual situation or crisis involving a major loss of EATMN capacity, or a major imbalance between EATMN capacity and demand, or a major failure in the information flow in one or several parts of EATMN.
European Supplement CrisisManagement Set of activities described in the Manage Crisis Event process.
CrewMember A person assigned by an operator to duty on an aircraft during a flight duty period.
Course The intended direction of travel of an aircraft, expressed in degrees from North (true, magnetic or grid).
Coulomb The quantity of electricity transported in 1 second by a current of 1 ampere.
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.)
European Supplement CORAPreference The aircraft operator preferences to be used in case of conflict resolutions: a preferred route associated with a preferred cruise level. These preferences are only used for conflict resolution.
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.
European Supplement CoordinationProceduresAgreement Agreement between ATC units on the procedures to be used in coordinating their respective ATC services.
European Supplement CoordinationPoint A point on or adjacent to the boundary used by the ATC units and referred to in coordination processes.
CoordinationMessage A message transmitted in support of the coordination dialogue between ATS Units.
European Supplement CoordinationMessage A message transmitted in support of the coordination dialogue between ATS Units.
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.
European Supplement 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.
CoordinateReferenceSystem Coordinate system that is related to the real world by a datum.
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.
ConvectionCell A volume of convective air.
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.
ControlZone A controlled airspace extending upwards from the surface of the earth to a specified upper limit.
ControlSector A subdivision of a designated control area within which responsibility is assigned to one controller or to a small group of controllers.
European Supplement ControllerRoleAuthorization The aggregated authorizations (licences and ratings) required to fill the agent roles in question.
European Supplement ControlledTimeOver An ATM imposed constraint over a point.
European Supplement ControlledTimeOfArrival An ATM imposed time constraint on a defined point associated to an arrival runway.
ControlledAirspace An airspace of defined dimensions within which air traffic control service is provided in accordance with the airspace classification.
ControlAreaBoundaryPoint A defined point on the control area boundary common to adjacent Air Traffic Service Units.
ControlArea A controlled airspace extending upwards from a specified limit above the earth.
European Supplement ControlArea A controlled airspace extending upwards from a specified limit above the earth.
European Supplement Contract A written or spoken agreement that is intended to be enforceable by law.
Contour An estimated or observed outline of a particular weather situation.
ContinuePresentHeading Instruction to continue to fly on the current heading.
ContactInformation Information required to enable contact with the responsible person and/or organisation.
European Supplement ConstrainingAirspaceActivity A qualification of the impact of an airspace reservation over a route segment.
ConstrainedAirspaceCrossing The event of crossing constrained airspace designated as a line.
ConflictHorizon The extent to which hazards along the aircraft's future trajectory are considered for separation provision.
Conflict Any situation involving an aircraft and a hazard in which the applicable separation minima may be compromised.
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.
European Supplement ConditionalRouteCategoryTwo A non-permanently plannable Conditional Route.
European Supplement ConditionalRouteCategoryThree A not plannable Conditional Route.
European Supplement ConditionalRouteCategoryOne A permanently plannable Conditional Route.
European Supplement ConditionalRoute A non-permanent ATS route or portion thereof which can be planned and used under specified conditions.
European Supplement ComplexityCount Indicator reflecting the number of simultaneous or near- simultaneous interactions of trajectories in a given Reference Location and instant of time. Together with the Occupancy Count, it supports the identification of flows highly contributing to the traffic complexity.
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).
CommonMarkRegisteringAuthority The authority maintaining the non-national register or, where appropriate, the part thereof, in which aircraft of an international operating agency are registered.
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.
European Supplement CommercialFlightPlan Flight plan produced by schedule departments at early stage of the planning, for commercial purposes and for planning coordination with airports.
CommercialAirTransportOperation An aircraft operation involving the transport of passengers, cargo or mail for remuneration or hire.
CommencementDeicingTime Time at which the deicing operation commences.
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.
European Supplement ClosedLoopClearance A clearance resulting in a revision of one portion of the RBT, e.g. a direct route from a point of the original RBT to another point of the original RBT.
ClockTime A time is given by an hour, minute and second.
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.
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.
ClimbToLevel Instruction that a climb to a specified level is to commence and once reached the specified level is to be maintained.
ClimbToCruisingLevelOrAltitude The phase of flight in which the climb from the completion of the initial climb to cruising level or altitude occurs.
European Supplement ClimbPerformanceProfile The optimum and unconstrained climbing capability of the aircraft.
ClimbAtVerticalRateMinimum Instruction to climb at not less than the specified rate.
ClimbAtVerticalRateMaximum Instruction to climb at not above the specified rate.
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.
ClearedRoute Instruction to proceed via the specified route.
ClearAirTurbulence Upper-atmospheric turbulence encountered by an aircraft when flying through clear air.
European Supplement CivilRPASOperation Aircraft operation performed by a civil unmanned aerial vehicle.
European Supplement CivilMilitaryCrossing The agreed and proposed civil military crossing conditions of an aircraft.
City A town or other inhabited place.
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.
Cirrostratus Transparent, whitish cloud veil of fibrous (hair-like) or smooth appearance, totally or partially covering the sky, and generally producing halo phenomena.
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.
CirclingApproach An extension of an instrument approach procedure which provides for visual circling of the aerodrome prior to landing.
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.
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.
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.
European Supplement Certificate A document certifying the status or acquirements of the bearer, or his fulfillment of conditions which authorize him to act or practise in a specified way.
European Supplement CentralisedAirspaceDataFunction A function that has been established within the Network Manager Operations Centre (NMOC) to collect Airspace Use Plan (AUP) information from the Airspace Management Cells (AMC).
Ceiling Height above the Earth's surface of the base of the lower cloud layer whose amount exceeds a specific value.
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.
CargoAirService An air service provided for the public transport of freight and mail.
Cargo Any property carried on an aircraft other than mail, stores and accompanied or mishandled baggage.
European Supplement CapacityPlan The capacity of a Traffic Volume over a given period of time.
Capacity The maximum number of aircraft that can be accommodated in a given time period by the system or one of its components (throughput).
European Supplement Capacity The maximum number of aircraft that can be accommodated in a given time period by the system or one of its components (throughput).
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.
CancellationMessage A message transmitted when a flight, for which basic flight plan data (FPL) has been previously distributed, has been cancelled.
European Supplement CancelDeparturePlanningInformation Departure Planning Information message informing Network Operations that previously sent DPI is no longer valid.
CalibratedAirspeed Indicated airspeed corrected for instrument errors and position error (due to incorrect pressure at the static port caused by airflow disruption).
Calendar Discrete temporal reference system that provides the basis for defining temporal position to a resolution of one day (ISO 19108).
European Supplement CalculatedTimeOver A time calculated by the appropriate air traffic services unit at which an aircraft will arrive at a specified significant point.
European Supplement CalculatedTakeOffTime A time calculated and issued by the appropriate Central Management Unit, as a result of tactical slot allocation, at which a flight is expected to become airborne.
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.
European Supplement BusinessTrajectory A trajectory enriched with other information that expresses the business intentions of civil airspace users (respectively scheduled, non-scheduled and general aviation).
BusinessService The provision of tangible goods, information, instructions or guidance.
European Supplement BusinessService The provision of tangible goods, information, instructions or guidance.
European Supplement BusinessDevelopmentTrajectory The trajectory initially planned by the civil airspace user to be shared with the wider aviation community only once the corporate plans are sufficiently mature.
European Supplement BuildingBlock Elementary sections of modularised airspace (as defined by the appropriate airspace provider) that are too small individually for controlling purposes, but instead form the basic constituent parts of a controlling block as part of an optimising process.
BriefingService Pre-flight and post-flight briefing service.
BridgeSide Line representing the side extent of aerodrome feature(s) associated with the vertical drop section of an overpass.
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.
European Supplement BrakingActionObservation An observation of the actual deceleration made by a pilot when stopping an aircraft.
European Supplement BoundaryPoint A trajectory point at which the 4D Trajectory intersects the boundary of an airspace.
European Supplement BottomOfDescent A trajectory point marking the transition from a descent phase to a cruise phase.
European Supplement BottomOfClimb A trajectory point marking the transition from a cruise phase to a climb phase.
European Supplement BoardingTime Time at which the boarding operation starts.
European Supplement BirdConcentrationObservation The presence of birds on or around the airport constituting a potential hazard to aircraft operations, observed by a pilot during the flight.
European Supplement BeginStayPoint The point at which the flight is expected to begin an operation at which the flight will remain for some time.
BeginStay The beginning of an operation at which the flight will remain for some time.
Becquerel The activity of a radionuclide having one spontaneous nuclear transition per second.
European Supplement BasicEmissionsSubjectOfAssessment The subject for assessment for green house emissions is air traffic, in terms of flights and associated entities.
European Supplement BasicEmissionsAssessmentOutput The set of emissions metrics which are computed by the following indicators: - The amount of gaseous emissions - The amount of particles emissions - The values of the emissions proxies indicators, such as the flown distance or the fuel burn. The metrics can be inefficiency metrics, determined by optimal trajectories comparisons, or simple sums.
European Supplement BasicEmissionsAssessmentCriterion A criterion used for the basic emissions assessment, such as: - The environmental model (methods and processes which decode the subject to generate the metric result that is required by the assessment. - The Assessment area (the geographical and temporal context, in which the assessment is done).
European Supplement BasicEmissionsAssessment The measurement of the emissions of green house gases from air traffic.
European Supplement BaggageFlow The loading and unloading of baggage.
European Supplement BADATypeCode The identifier of the aircraft in the Base Of Aircraft Data (BADA) database.
AuxiliaryPowerUnit A self-contained power-unit on an aircraft providing electrical/pneumatic power to aircraft systems during ground operations.
AutomaticTerminalInformationService The automatic provision of current, routine information to arriving and departing aircraft throughout 24 hours or a specified portion thereof.
AutomaticPortableELT An automatically activated ELT which is rigidly attached to an aircraft but readily removable from the aircraft.
AutomaticFixedELT An automatically activated ELT which is permanently attached to an aircraft.
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.
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.
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.
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.
AutomatedWeatherObservationSystem Automated sensor suites which are designed to serve aviation and meteorological observing needs for safe and efficient aviation operations and weather forecasting.
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.
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).
AtTimeProceedDirectToPosition Instruction to proceed, at the specified time, directly to the specified position.
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.
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.
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.
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.
ATSUnitLocationIndicator A four-letter code group formulated in accordance with rules prescribed by ICAO and assigned to the ATS unit.
ATSSurveillanceSystem A generic term meaning variously, ADS-B, PSR, SSR or any comparable ground-based system that enables the identification of aircraft.
ATSSurveillanceService A term used to indicate a service provided directly by means of an ATS surveillance system.
ATSRoute A specified route designed for channelling the flow of traffic as necessary for the provision of air traffic services.
AtPositionProceedDirectToPosition Instruction to proceed, at the specified position, directly to the next specified position.
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.
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.
AtPositionClearedRoute Instruction to proceed from the specified position via the specified route.
AtPositionClearedProcedure Instruction to proceed from the specified position via the specified procedure.
AtNode The event of arriving at an aerodrome surface routing network node.
ATMTrajectoryConstraint Trajectory constraint imposed by the ATM system.
European Supplement ATMProcedureImplementation Implementation level defined at an airport for an Air Traffic Management procedure.
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.
European Supplement 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.
European Supplement ATMPhase A period in time grouping related collaborative ATM activities relative to a flight or a group of flights.
European Supplement AtmosphereModel The atmosphere model used in an assessment. The atmospheric model is defined by a meteorological report: A reference area that is covered by the report; The area is a ground defined area (latitudes and longitudes); A list of flight levels on witch the observation is relevant within the area; The meteorological observation at the considered flight level
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.
AtLevelProceedDirectToPosition Instruction to proceed, upon reaching the specified level, directly to the specified position.
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
European Supplement 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
European Supplement ATFMSlotSubstitutionOnCancellation Possibility for an AU of keeping the ATFM slot of a cancelled flight for another flight until a time-out.
European Supplement ATFMRegulationSlotStatus Status of an ATFM Regulation Slot (free, pre-allocated, allocated, forced).
European Supplement ATFMRegulationSlot A slot within a regulation defined according to the regulation rate and period.
European Supplement ATFMRegulation An ATFCM measure implemented by means of a departure slot in order to balance traffic demand against available ATC capacity.
European Supplement ATFMPreAllocatedSlotSwap Possibility for an AU to swap a regulated flight being in the slot-allocated status with another flight still in the pre-allocated status.
ATFMPhase A phase in which ATFM is carried out.
European Supplement ATFMPhase A phase in which ATFM is carried out.
European Supplement ATFMMeasure The actions taken to perform air traffic flow management and capacity management.
European Supplement ATFMHotspot A time period on a traffic volume indicating that there is too much traffic according to occupancy counts or complexity analysis for a specific occupancy traffic count duration.
European Supplement ATFMEvent A situation involving a loss of EATMN capacity, or an imbalance between EATMN capacity and demand, or a failure in the information flow in one or several parts of EATMN.
European Supplement ATFMDepartureSlotImprovementProposal ATFM Slot amendment proposal in which a new Calculated Take-Off Time (CTOT) is provided which improves the original slot.
European Supplement ATFMDepartureSlot A calculated take-off time attributed by the central unit for ATFM with a time tolerance managed by the local ATS unit.
European Supplement ATFMDelay The duration between the last take-off time requested by the aircraft operator and the take-off slot allocated by the Central Flow Management Unit following a regulation communicated by the FMP, in relation to an airport (airport delay) or sector (en-route delay) location.
European Supplement ATFMDailyPlan The set of tactical air traffic flow management measures prepared during the Pre-Tactical phase.
European Supplement ATFCMSlotMessage A message involved in ATFCM slot allocation
European Supplement ATFCMNotificationMessage The official medium for the notification of Air Traffic Flow and Capacity Management (ATFCM) measures, published by the Network Manager Operations Centre (NMOC) during the day before the day of operation (D-1), in order to provide a summary of planned ATFCM measures, and to promulgate any specific instructions or communication requirements associated with those measures.
European Supplement ATFCMInformationMessage A message transmitted by the Network Manager Operations Centre (NMOC) to provide information, advice and to promulgate instructions relating to the application of current Air Traffic Flow and Capacity Management (ATFCM) measures. It is also used for the initial publication of the Network Operations ATFCM operating procedures that affect all users.
European Supplement ATCRequest ATC request of information from an aircraft.
ATCInstruction Directives issued by air traffic control for the purpose of requiring a pilot to take a specific action.
European Supplement ATCFrequencyInadequacy A particular inadequacy about an ATC frequency, such as the unavailability of a frequency or some noise heard on a frequency.
European Supplement ATCDeparturePlanningInformation Departure Planning Information message sent between off-blocks and take-off. It serves to supply the Network Operations with a very accurate Target Take-Off Time (TTOT) based on the ATC established and stable departure sequence. It will allow a better monitoring of departures and will facilitate the identification of late updates requiring specific attention.
ATCClearance Authorization for an aircraft to proceed under conditions specified by an air traffic control unit.
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.
AssumedAltimeterSetting The altimeter setting that was used during prediction at this trajectory point for the computation of barometric altitude is provided.
European Supplement AssessmentStartTime The date and time when the assessment starts.
European Supplement AssessmentOutput The output for a specific assessment.
European Supplement AssessmentEndTime The date and time when the assessment ends.
European Supplement AssessmentCriterion A criterion to be used for a specific assessment.
European Supplement AssessmentArea The area for which the assessment is performed.
European Supplement Assessment The description of a specific assessment.
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.
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.
European Supplement 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.
European Supplement ArrivalRunwayOccupancyTime The time interval between the aircraft crossing the threshold and its tail vacating the runway.
European Supplement ArrivalRunwayOccupancyPhase The phase of flight between the aircraft crossing the threshold and its tail vacating the runway.
European Supplement ArrivalPair Identifier of the lead and the following aircraft for a pair in the arrival sequence.
ArrivalOperations The set of flight operations following procedures associated with the destination aerodrome.
European Supplement ArrivalOperations The set of flight operations following procedures associated with the destination aerodrome.
ArrivalMessage A message transmitted by the appropriate ATS unit on receiving an arrival report.
European Supplement ArrivalManagementTool Software based system used to improve arrival flows at one or more aerodromes by calculating an optimised landing sequence and flight specific time information at other significant points, taking into account all applicable constraints.
European Supplement ArrivalManagementStrategy The set of operational rules and procedures underlying the AMAN tool optimisation algorithm. The strategy implements the trade-off between the goals of equity, high throughput, and trajectory efficiency which has agreed between the stakeholders.
European Supplement ArrivalManagementAdvisory An arrival management advisory to a flight to achieve its landing at the AMAN Planned Threshold Time (APTT).
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.
AreaReport A meteorological report that includes information related to a region rather than a single point.
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.
AreaNavigationRoute An ATS route established for the use of aircraft capable of employing area navigation.
AreaControlService Air traffic control service for controlled flights in control areas.
AreaControlCentre A unit established to provide air traffic control service to controlled flights in control areas under its jurisdiction.
European Supplement ApronTaxiway A portion of a taxiway system located on an apron and intended to provide a through taxi route across the apron.
ApronManagementService A service provided to regulate the activities and the movement of aircraft and vehicles on an apron.
European Supplement ApronInadequacy A particular inadequacy about an apron.
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.
European Supplement AppropriateMilitaryUnit The relevant military authority responsible for providing air traffic services in the airspace concerned.
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.
AppropriateATSAuthority The relevant authority designated by the State responsible for providing air traffic services in the airspace concerned.
European Supplement AppropriateATSAuthority The relevant authority designated by the State responsible for providing air traffic services in the airspace concerned.
ApproachSequence The order in which two or more aircraft are cleared to approach to land at the aerodrome.
European Supplement ApproachSequence The order in which two or more aircraft are cleared to approach to land at the aerodrome.
ApproachProcedureWithVerticalGuidance An instrument approach procedure which utilizes lateral and vertical guidance but does not meet the requirements established for precision approach and landing operations.
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.
European Supplement 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.
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.
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.
ApproachControlUnit A unit established to provide air traffic control service to controlled flights arriving at, or departing from, one or more aerodromes.
ApproachControlService Air traffic control service for arriving or departing controlled flights.
European Supplement ApproachClearance Authorization for an aircraft to proceed with the approach under conditions specified by an air traffic control unit.
European Supplement ANPTypeCode Type of aircraft corresponding to the Aircraft Noise Performance (ANP) database list.
AnchorageArea An area designated specifically for the parking of seaplanes.
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.
European Supplement AMDAR An automated meteorological report from an aircraft during flight.
European Supplement AMCManageableArea An area subject to management and allocation by an AMC at ASM Level 2 and level 3.
European Supplement AMANSpeedAdvisory An arrival management advisory in the form of an airspeed or groundspeed to be applied in order to land at the AMAN Planned Threshold Time (APTT).
European Supplement AMANRouteAdvisory An arrival management advisory in the form of a route to be followed in order to land at the AMAN Planned Threshold Time (APTT).
European Supplement AMANProcedureAdvisory An arrival management advisory in the form of an ATC procedure to be followed in order to land at the AMAN Planned Threshold Time (APTT).
European Supplement AMANPlannedThresholdTime The time, calculated by the Arrival Manager tool, at which the aircraft is planned to cross the runway threshold.
European Supplement AMANGroundDelayAdvisory An arrival management advisory in the form of an indication of a Ground Delay to be applied at the departure aerodrome in order to land at the AMAN Planned Threshold Time (APTT).
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.
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.
Altitude The vertical distance of a level, a point or an object considered as a point, measured from mean sea level (MSL).
AltimeterSource An instrument which measures vertical distance with respect to a reference level.
AltimeterSettingRegion An airspace of defined dimensions within which standardized altimeter setting procedures apply.
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.
European Supplement AlertStatus A code describing the activation status of the alert.
European Supplement AlertSeverityLevel The severity level of the alert.
AlertPhase A situation wherein apprehension exists as to the safety of an aircraft and its occupants.
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.
AlertingService A service provided to notify appropriate organizations regarding aircraft in need of search and rescue aid, and assist such organizations as required.
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.
European Supplement Alert Indication of an actual or potential hazardous situation that requires particular attention or action.
Airway A control area or portion thereof established in the form of a corridor.
AirTrafficServicesUnit A generic term meaning variously, air traffic control unit, flight information centre or air traffic services reporting office.
European Supplement AirTrafficServicesUnit A generic term meaning variously, air traffic control unit, flight information centre or air traffic services reporting office.
AirTrafficServicesReportingOffice A unit established for the purpose of receiving reports concerning air traffic services and flight plans submitted before departure.
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.
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).
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.
European Supplement AirTrafficFlowManagementUnit A unit in charge of providing Air Traffic Flow Management.
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.
European Supplement AirTrafficFlowAndCapacityManagement ATFM extended to include the optimisation of traffic patterns and capacity management. Through managing the balance of capacity and demand the aim of ATFCM is to enable flight punctuality and efficiency, according to the available resources with the emphasis on optimising the network capacity through the collaborative decision making process.
AirTrafficControlUnit A generic term meaning variously, area control centre, approach control unit or aerodrome control tower.
European Supplement AirTrafficControlUnit A generic term meaning variously, area control centre, approach control unit or aerodrome control tower.
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.
AirTrafficAdvisoryService A service provided within advisory airspace to ensure separation, in so far as practical, between aircraft which are operating on IFR flight plans.
European Supplement AirTrafficAdvisoryService A service provided within advisory airspace to ensure separation, in so far as practical, between aircraft which are operating on IFR flight plans.
European Supplement AirTrafficAdvisory Traffic information and suggestions to a possible course of action provided to aircraft in advisory airspace.
AirTraffic All aircraft in flight or operating on the manoeuvring area of an aerodrome.
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.
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.
European Supplement AirspaceUsePlan An ASM message of NOTAM status notifying the daily decision of an Airspace Management Cell on the temporary allocation of the airspace within its jurisdiction for a specific time period, by means of a standard message format.
AirspaceStatus The activation status of the airspace.
European Supplement AirspaceStatus The activation status of the airspace.
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').
European Supplement AirspaceReservationRequest Request for obtaining airspace to be used for a special activity (military or other).
European Supplement AirspaceReservation The result of the procedure through which a volume is temporary reserved for an activity.
European Supplement AirspaceOrganisation The organisation responsible for the airspace design and consolidation of airspace needs under consideration of traffic demand forecast.
European Supplement AirspaceOccupancyPhase The phase of flight during which the aircraft flies within a given airspace.
European Supplement AirspaceManagementCell A joint civil/military cell responsible for the day-to-day management and temporary allocation of national or sub-regional airspace under the jurisdiction of one or more ECAC state(s).
AirspaceLocationIndicator A four-letter code group formulated in accordance with rules prescribed by ICAO and assigned to the airspace.
AirspaceExit The event of exiting an airspace.
European Supplement AirspaceExit The event of exiting an airspace.
AirspaceEntry The event of entering an airspace.
European Supplement AirspaceEntry The event of entering an airspace.
AirspaceClassification A classification of airspace which determines the operating rules, flight requirements, and services provided.
AirspaceClassG Airspace Classification whereby IFR and VFR flights are permitted and receive flight information service if requested.
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.
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.
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.
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.
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.
AirspaceClassA Airspace Classification whereby IFR flights only are permitted, all flights are provided with air traffic control service and are separated from each other.
European Supplement AirspaceAllocation Qualification in time (time period) and level (level range) of the pieces of airspace infrastructure allocated to an airspace reservation.
Airspace A defined three dimensional region of space relevant to air traffic.
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.
European Supplement AirportTransitView The path and operations linked to an aircraft during its visit" to the airport. It starts at the Initial approach fix (STAR) and includes the taxi-in segment, the turn round processes from the airspace user, the taxi-out segment and ends with the handover to the TMA departure controller at the SID."
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.
AirportSuppliesService A service that provides supplies (fuel, oil, oxygen, etc.) to aircraft.
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.
European Supplement AirportResourceStatus The status of airport resources that may limit airport capacity (this may include shortage of staff and equipment).
European Supplement AirportOperator The civilian or military agency, group or individual which exercises control over the operations of the civil airport or military airfield.
European Supplement AirportOperationsPlan A single, common and collaboratively agreed rolling plan available to all airport stakeholders whose purpose is to provide common situational awareness and to form the basis upon which stakeholder decisions relating to process optimisation can be made.
European Supplement AirportOperationsParameter Configuration Parameter used for efficient Airport Operations. Each parameter typically depends on a number of elements such as Aircraft type, Airline procedure. They may also depend on specific conditions such as weather. The parameters listed here, a small subset of what is necessary for Airport Operations, are the ones for which an agreed terminology exists.
European Supplement AirportOperationsManagement All the airport operational support activities, including analysis of airport resources, long term planning of infrastructures, coordination of airport slots, and management of airport resources on the day of operation.
AirportGroundService Services that provide maintenance of the airport infrastructure and direct support to aircraft on the ground.
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.
European Supplement AirportCoordinator natural or legal person with detailed knowledge of airline scheduling coordination, responsible for the allocation of slots at a coordinated airport.
AirportClearanceService An airport ground service providing clearance capabilities for airport surfaces.
European Supplement AirportCDMAlert A system generated message which alerts the Airport CDM Partners of an irregularity and which normally requires one or more partners to make a manual intervention to resolve the irregularity.
European Supplement AirportCapacity The number of arrivals, departures and total aircraft movements, taking into account the composite effect of airside taxiway and landside constraints.
AirportArrivalSlotTime The time for the Airport Arrival Slot as allocated by the Airport Slot Coordinator
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.
AirOperatorCertificate A certificate authorizing an operator to carry out specified commercial air transport operations.
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.
Airline As provided in Article 96 of the Convention, any air transport enterprise offering or operating a scheduled international air service.
European Supplement AirGroundVoice Infrastructure enabling voice communication between FOC, ATC and aircraft.
European Supplement AirGroundDataLink Infrastructure combining radio equipment, antennas, based-station controllers (BSC), cabling to enable air-ground data communication with aircraft via Datalink.
European Supplement AirframeEquipment An individual component of the body of an aircraft as distinct from its engine.
AirFiledFlightPlan A flight plan provided to an air traffic services unit by an aircraft during its flight.
AIREP A report from an aircraft in flight prepared in conformity with requirements for position, and operational and/or meteorological reporting.
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).
AircraftWeight A characteristic weight value of an aircraft.
AircraftTypeDesignator A group of alphanumeric characters used to identify, in an abbreviated form, a type of aircraft.
AircraftType The type of an aircraft.
AircraftState A vector describing the current state of an aircraft or a vehicle, e.g. position, speed, acceleration.
European Supplement AircraftStandTaxilane A portion of an apron designated as a taxiway and intended to provide access to aircraft stands only.
European Supplement AircraftStandDesignator The designator of an aircraft stand used to uniquely identify it at an aerodrome.
European Supplement AircraftStandConfiguration Configuration of aircraft stands available for use in a given airport operational mode.
AircraftStand A designated area on an apron intended to be used for parking an aircraft.
European Supplement AircraftStand A designated area on an apron intended to be used for parking an aircraft.
AircraftSeries A modifier, such as a numeral or sequential letter, denoting particular variations of a given aircraft model.
European Supplement AircraftReport A report type of meteorological conditions that includes aerial information, such as pilot reports or reports generated from onboard weather sensors.
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.
European Supplement AircraftPerformance The performance delivered by an aircraft.
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.
AircraftObservation The evaluation of one or more meteorological elements made from an aircraft in flight.
European Supplement AircraftObservation The evaluation of one or more meteorological elements made from an aircraft in flight.
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.
AircraftModel Each of a set of aircraft designs for a given aircraft make.
AircraftMake The aircraft brand.
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.
European Supplement 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.
European Supplement AircraftIntegratedConstraint Constraints that are published with the points in the EPP, that may be derived as a result of the constraints in the flight script, although they would not be contained within the flight script.
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.
European Supplement 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.
AircraftGroundService The availability of maintenance, support and/or supply operations to aircraft at an aerodrome.
European Supplement AircraftFlightStatus Status of an aircraft at an aerodrome combining information about the outbound flight, the inbound flight and the turnaround process.
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.
European Supplement 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.
AircraftEarthStation A mobile earth station in the aeronautical mobile-satellite service located on board an aircraft.
European Supplement AircraftDimensions The measurable extent of an aircraft.
European Supplement AircraftDerivedData Avionics data transmitted from the aircraft to the ground and possibly to other aircraft for surveillance application.
AircraftConfiguration An arrangement of one or more aircraft equipments in a particular form, figure, or combination.
AircraftCategory The aircraft categorization according to a set of criteria.
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.
European Supplement 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.
European Supplement AircraftCallsign A group of alphanumeric characters used to identify an aircraft in air-ground communication.
AircraftAvionics Any electronic device - including its electrical part - for use in an aircraft, including radio, automatic flight control and instrument systems.
AircraftApproachCategory Classification of aircraft based on 1.3 times stall speed in landing configuration at certified maximum landing mass.
AircraftAddress A unique combination of twenty-four bits available for assignment to an aircraft for the purpose of air-ground communications, navigation and surveillance.
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.
European Supplement 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.
European Supplement AirborneSpacingApplicationInstructionTermination Instruction sent by the Controller to the Flight Crew in order to stop the ASPA manoeuvre.
European Supplement AirborneSpacingApplicationInstruction An Airborne SpacingApplication (ASPA) instruction,and more specifically an ASPAS and M (for enhanced sequencing and merging) instruction contains an ASPA SandM manoeuvre as an element indicating the way the time spacing has to be acquired. Three manoeuvres can be requested from the trailer aircraft: - Remain behind, - Merge then Remain behind, and - Vector then Merge (then Remain) behind. Once the spacing is acquired, the three manoeuvres behave the same way i.e. maintain the requested spacing within the requested tolerance.
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.
AirborneHolding A tactical ATFM measure requiring aircraft to hold at a waypoint in a predefined standard holding pattern.
AIPSupplement Temporary changes to the information contained in the AIP which are published by means of special pages.
AIPAmendment Permanent changes to the information contained in the AIP.
European Supplement AimingPoint Aiming point for the TouchDownLiftOff zone.
European Supplement AIDCMessage A message used in coordination through ground-ground data link information exchange between ATC units.
European Supplement AgreementDocument Information on an Agreement in the form of a Document.
European Supplement Agreement A negotiated and typically legally binding arrangement between parties as to a course of action.
Agreed4DTrajectory The current 4D trajectory that is agreed between the airspace user and the ASP after collaboration, or imposition of pre-collaborated rules.
Agent Someone who produces or is capable of producing an effect.
European Supplement AfterPassingDescendTo Instruction that after passing the specified position a descent to the specified level is to commence and once reached the specified level is to be maintained.
European Supplement AfterPassingClimbTo Instruction that after passing the specified position a climb to the specified level is to commence and once reached the specified level is to be maintained.
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.
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.
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.
AeronauticalMeteorologicalStation A station designated to make observations and meteorological reports for use in international air navigation.
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.
AeronauticalInformationPublication A publication issued by or with the authority of a State and containing aeronautical information of a lasting character essential to air navigation.
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.
AeronauticalChart A representation of a portion of the Earth, its culture and relief, specifically designated to meet the requirements of air navigation.
AerodromeWarning Concise information of meteorological conditions which could adversely affect aircraft on the ground, including parked aircraft, and the aerodrome facilities and services.
AerodromeTrafficZone An airspace of defined dimensions established around an aerodrome for the protection of aerodrome traffic.
European Supplement AerodromeSystem A system at an aerodrome.
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.
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.
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.
AerodromeSign A sign presenting messages related to aircraft and vehicle movement.
European Supplement AerodromeSet Set of aerodromes used in the scope of Air Traffic Flow and Capacity Management (ATFCM).
European Supplement AerodromeRegulation A measure applied to an aerodrome.
AerodromeReferencePoint The designated geographical location of an aerodrome.
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.
AerodromeMeteorologicalOffice An office, located at an aerodrome, designated to provide meteorological service for international air navigation.
AerodromeMarker An object displayed at an aerodrome above ground level in order to indicate an obstacle or delineate a boundary.
AerodromeMappingDatabase A collection of aerodrome mapping data organized and arranged as a structured data set.
AerodromeMappingData Data collected for the purpose of compiling aerodrome mapping information.
AerodromeLocationIndicator A four-letter code group formulated in accordance with rules prescribed by ICAO and assigned to the aerodrome.
European Supplement AerodromeInadequacy A particular inadequacy about an aerodrome.
European Supplement AerodromeIATADesignator The identifier that is assigned to a location in accordance with rules (resolution 767) governed by the International Air Transport Association (IATA).
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.
AerodromeElevation The elevation of the highest point of the landing area.
AerodromeControlTower A unit established to provide air traffic control service to aerodrome traffic.
AerodromeControlService Air traffic control service for aerodrome traffic.
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.
European Supplement 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.
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.
AerialRefuelling A procedure used by the military to transfer fuel from one aircraft to another during flight.
AdvisoryArea A designated area within a flight information region where air traffic advisory service is available.
AdvisoryAirspace An airspace of defined dimensions, or designated route, within which air traffic advisory service is available.
European Supplement ADSBTargetReport Defines which target reports are used by the Multi Sensor Tracking.
European Supplement ADSBSurfaceTargetReport Defines which target reports are used by the Surface Multi Sensor Tracking.
European Supplement ADSBOutCapability ADS-B out allows the aircraft to broadcast position, speed, altitude, flight ID, Wake Vortex category, etc
European Supplement ADSBGroundStation A ground station that may automatically transmit and/or receive ADS-B data such as identification, position and additional data, as appropriate, in a broadcast mode via a data link.
European Supplement ADSBAirTargetReport The definition of a target report for Air Surveillance
European Supplement ActualTurnaroundTime Time difference between the Actual off-block time (AOBT) minus the Actual in-block time (AIBT).
European Supplement ActualTimeOver The time at which a flight actually arrives over a significant point.
European Supplement ActualTaxiOutTime Time difference between the Actual Take-Off Time (ATOT) minus the Actual Off-Block Time (AOBT).
European Supplement ActualTaxiInTime Time difference between the Actual in-block time (AIBT) minus the Actual landing time (ALDT).
European Supplement ActualTakeOffTime The time that an aircraft takes off from the runway.
European Supplement ActualStartUpRequestTime Time the pilot requests start up clearance.
European Supplement ActualStartUpApprovalTime Time that an aircraft receives its start up approval.
European Supplement ActualStartBoardingTime The time when passengers are entering the bridge or bus to the aircraft.
European Supplement ActualReadyTime The time when the aircraft is ready for start up/push back or taxi immediately after clearance delivery, meeting the requirements set by the TOBT definition.
European Supplement ActualReadyForDeicingTime The time when the aircraft is ready to be de-iced.
European Supplement ActualOffBlockTime The actual date and time the aircraft has vacated the parking position (pushed back or on its own power).
European Supplement ActualLandingTime The actual date and time when the aircraft has landed (touch down).
European Supplement ActualInBlockTime The actual date and time when the aircraft parking brakes have been engaged at the parking position.
European Supplement ActualGroundHandlingTime The total duration of the ground handling of the aircraft.
European Supplement ActualEndOfGroundHandlingTime The time when ground handling on an aircraft ends, can be equal to Actual Ready Time (ARDT) (to be determined locally).
European Supplement ActualEndOfDeicingTime The time when de-icing operations on an aircraft end.
European Supplement ActualEndDeboardingTime The actual time when disembarkation from an aircraft ends.
European Supplement ActualDemand Demand evaluated from Airspace Users' requests such as filed flight plans and shared/reference business trajectories.
European Supplement ActualDeicingTime Time difference between the Actual End of De-icing Time (AEZT) minus the Actual Commencement of De-icing Time (ACZT).
European Supplement ActualCommenceOfGroundHandlingTime The time when ground handling on an aircraft starts, can be equal to the Actual In-Block Time (AIBT) (to be determined locally).
European Supplement ActualCommencementOfDeicingTime The time when de-icing operations on an aircraft starts.
European Supplement ACTMessage An OLDI coordination message satisfying the following operational requirements: Replace the verbal boundary estimate by transmitting automatically details of a flight from one ATC unit to the next prior to the transfer of control; Update the basic flight plan data in the receiving ATC unit with the most recent information; Facilitate distribution and display of flight plan date within the receiving ATC unit to the working positions involved; Enable display of correlation in the receiving ATC unit; Provide transfer conditions to the receiving ATC unit.
European Supplement ActiveSectorConfiguration The sector configuration that is currently used for enabling air traffic control operations within a control area.
European Supplement ActiveRunwayConfiguration The Runway Configuration that is currently used for flight operations in and out of the airport.
European Supplement ActiveAdvisoryHorizon The Arrival Management horizon at which advisories for AMAN sequence implementation presented to the air traffic controller are reliable and useful (i.e. stable).
AcrobaticFlight Manoeuvres intentionally performed by an aircraft involving an abrupt change in its attitude, an abnormal attitude, or an abnormal variation in speed.
European Supplement ACDMIrregularityType Element from the configuration that describes the kind of irregularity that can be raised for A-CDM.
European Supplement ACDMIrregularity An irregularity which normally requires one or more partners to make a manual intervention to resolve the irregularity.
Accuracy A degree of conformance between the estimated or measured value and the true value.
AcceptingUnitOrController Air traffic control unit next to take control of an aircraft.
European Supplement AcceptingUnitOrController Air traffic control unit next to take control of an aircraft.
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.
AccelerateStopDistanceAvailable The length of the take-off run available plus the length of the stopway, if provided.
European Supplement ABIMessage An OLDI notification message satisfying the following operation requirements: Provide for acquisition of missing flight plan data; Provide advance boundary information and revisions thereto for the next ATC unit; Update the basic flight plan data; Facilitate early correlation of flight plan data; Facilitate accurate short-term sector load assessment; Request the assignment of an SSR code from the unit to which the above notification is sent, if required.
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.
European Supplement 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.