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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 (RR S1.32). A mobile service
between aeronautical stations and aircraft stations,
or between aircraft stations, in which survival craft
stations may participate; emergency position-indicating
radiobeacon stations may also participate in this service on
designated distress and emergency frequencies.
Aeronautical station (RR S1.81). 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 telecommunication
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
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 meteorological
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 inconclusive
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 telecommunication
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 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.
AIRPROX. The code word used in an air traffic incident
report to designate aircraft proximity.
Chapter 1. Definitions 1-3
1/11/01
Air-report. A report from an aircraft in flight prepared in
conformity with requirements for position, and operational
and/or meteorological reporting.
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.— The actual height may vary, and some
helicopters may require air-taxiing above 8 m (25 ft) AGL
　
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