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Terms for subject Aviation (1895 entries)

air taxi	The movement of a helicopter or vertical takeoff and landing aircraft (VTOL) above the surface of an aerodrome but normally not above 100 ft AGL. The aircraft may proceed via flight at airspeeds of more than 20 kt.
air traffic	All aircraft in flight or operating on the manoeuvring area of an aerodrome
air traffic advisory service	A service provided within advisory airspace to ensure separation, in so far as practical, between aircraft which are operating on IFR flight plans
air traffic clearance	An authorization issued by an ATC unit for an aircraft to proceed within controlled airspace in accordance with the conditions specified by that unit
air traffic control clearance	An authorization issued by an ATC unit for an aircraft to proceed within controlled airspace in accordance with the conditions specified by that unit
air traffic control instruction	A directive issued by an ATC unit for ATC purposes
air traffic control operations support specialist	An employee assigned to perform non-control functions in an ATC unit
air traffic control service	A service provided for the purposes of (a) preventing collisions between (i) aircraft; (ii) aircraft and obstacles; and (iii) aircraft and vehicles on the manoeuvring area; and (b) expediting and maintaining an orderly flow of air traffic
air traffic control specialist	A person holding a valid licence to control air traffic
air traffic control unit	As the circumstances require, this may be (a) an area control centre (ACC) established to provide ATC service to aircraft; or (b) an airport control tower unit established to provide ATC service to airport traffic
air traffic controller	A person holding a valid licence to control air traffic
air traffic flow management	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
air traffic management	A management concept aimed at ensuring full utilization of ATC systems, according to the possibilities offered by future air navigation systems, as they evolve, from both a national and an international perspective
air traffic service	A service that includes ATC service, flight services and alerting service
ATR	air turbo-rocket engine
air-ground communication	Two-way communication between aircraft and stations or locations on the surface of the earth
air-taxiing	Movement of a helicopter (VTOL) above the surface of an aerodrome, normally in ground effect and at a ground speed normally less than 37 km/h (20 kt) Note ICAO: The actual height may vary, and some helicopters may require air-taxiing above 8 m (25 ft) AGL to reduce ground effect turbulence or provide clearance for cargo slingloads.
AIRAC Canada	A type of notice issued weekly by the aeronautical information service (AIS) to provide producers of aeronautical information with advance notification concerning changes within the Canadian Domestic Airspace (CDA) and any other airspace in respect of which Canada has the responsibility for the provision of ATC service
abn	airborne
airborne collision avoidance system	An aircraft system based on secondary surveillance radar (SSR) transponder signals which operates independently of ground-based equipment to provide advice to the pilot on potential conflicting aircraft that are equipped with SSR transponders