RadioAltimeterOperatingArea
urn:aero:airm:1.0.0:ConceptualModel:Subjects:BaseInfrastructure:AerodromeInfrastructure:RadioAltimeterOperatingArea
A flat area established in the pre-threshold area of a precision approach runway to accommodate aeroplanes making auto-coupled approaches and automatic landings.
Source:
ICAO Annex 14, Vol. I, Fifth Edition,