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• when set toQNHor AreaQNH itwill indicate altitude;
• when set toStandardPressure (1013.2HPa) itmaybeused to
indicateflight levels.
AltimeterSettingRegion:
Airspace 10000 ft andbelowwhere the
sub-scaleof apressure sensitive altimeter is set toQNHor AreaQNH.
Altitude:
The vertical distanceof a level, apoint or anobject,
considered as apoint,measured frommean sea level.
ApproachControlService:
ATC service for arrivingor departing
flights.
ApproachSequence:
Theorder inwhich twoormore aircraft are
cleared to approach to land at the aerodrome.
Apron:
Adefinedareaona land aerodrome, intended toaccommodate
aircraft for purposes of loadingor unloadingpassengers,mail, cargo,
fuelling, parkingormaintenance.
ApronService:
A traffic regulatory and information serviceprovided
to aircraft using the apron areaof an aerodrome.
ApronTaxiway:
Aportionof a taxiway system locatedon an apron
and intended toprovide a through taxi route across the apron.
AreaControlService:
Air traffic control service for controlledflights
in control areas.
AreaNavigation (RNAV):
Amethodof navigationwhichpermits
aircraft operationon anydesiredflight pathwithin the coverageof
groundor space-basednavigation aids, orwithin the limits of the
capabilityof self-contained aids, or a combinationof these.
AreaNavigation (RNAV) Route:
AnATS routeestablished for theuse
of aircraft capableof employing areanavigation.
AreaQNH:
A forecast altimeter settingwhich is representativeof the
QNHof any locationwithin aparticular area.
ATSRoute:
A specified routedesigned for channelling theflowof traffic
as necessary for theprovisionof air traffic services.
ATSSurveillanceService:
Termused to indicateanair traffic service
provideddirectlybymeans of anATS surveillance system.
definitions