PANS-RAC (Doc 4444) 1-1
Aeronautical fixed service (AFS). A telecommunication service between specified fixed points provided primarily for the safety of air navigation and for the regular, efficient and economical operation of air services.
Aeronautical fixed station. A station in the aeronautical fixed service.
Aeronautical ground light. Any light specially provided as an aid to air navigation, other than a light displayed on an aircraft.
Aeronautical Information Publication (AIP). A publication issued by or with the authority of a State and containing aeronautical information of a lasting character essential to air navigation.
Aeronautical mobile service. A mobile service between aeronautical stations and aircraft stations, or between air-craft stations, in which survival craft stations may partici-pate; emergency position-indicating radiobeacon stations may also participate in this service on designated distress and emergency frequencies.
Aeronautical station. A land station in the aeronautical mobile service. In certain instances, an aeronautical station may be located, for example, on board ship or on a platform at sea.
Aeronautical telecommunication service. A telecommuni-cation service provided for any aeronautical purpose.
Aeronautical telecommunication station. A station in the aeronautical telecommunication service.
Airborne collision avoidance system (ACAS). 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.
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.
Aircraft address. A unique combination of 24 bits available for assignment to an aircraft for the purpose of air-ground communications, navigation and surveillance.
Aircraft identification. A group of letters, figures or a combination thereof which is either identical to, or the
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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.
Aircraft observation. The evaluation of one or more meteoro-logical elements made from an aircraft in flight.
Aircraft proximity. A situation in which, in the opinion of a pilot or air traffic services personnel, the distance between aircraft as well as their relative positions and speed have been such that the safety of the aircraft involved may have been compromised. An aircraft proximity is classified as follows:
Risk of collision. The risk classification of an aircraft proximity in which serious risk of collision has existed.
Safety not assured. The risk classification of an aircraft proximity in which the safety of the aircraft may have been compromised.
No risk of collision. The risk classification of an aircraft proximity in which no risk of collision has existed.
Risk not determined. The risk classification of an aircraft proximity in which insufficient information was available to determine the risk involved, or incon-clusive or conflicting evidence precluded such determination.
Air-ground communication. Two-way communication between aircraft and stations or locations on the surface of the earth.
Air-ground control radio station. An aeronautical telecom-munication station having primary responsibility for handling communications pertaining to the operation and control of aircraft in a given area.
AIRMET information. Information issued by a meteoro-logical 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.
　
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