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buildings, installations and equipment) intended to be used
either wholly or in part for the arrival, departure and surface
movement of aircraft.
Aerodrome control service. Air traffic control service for
aerodrome traffic.
Aerodrome control tower. A unit established to provide air
traffic control service to aerodrome traffic.
Aerodrome treff~. All traffic on the manoeuvring area of an
aerodrome and all aircraft flying in the vicinity of
an aerodrome.
ANNEX 11
Annex I1 - Air T r a m Services Chnpter I
Note.- An aircraft is in the vicinity of an aerodrome when Air trafic control clearance. Authorization for an aircraft to
it is in, entering or leaving an aerodrome traffic circuit. proceed under conditions specified by an air traffic control
unit.
Aeronautical fixed service (AFS). A telecommunication service
between specified fixed points provided primarily for Note 1.- For convenience, the term "air traflc control
the safety of air navigation and for the regular, efficient and clearance" isfrequently abbreviated to "clearance" when used
economical operation of air services. in appropriate contexts.
Aeronautical Information Publication (AIP). A publication Note 2.- The abbreviated term "clearance" may be preissued
by or with the authority of a State and containing Ned by the words "taxi", "take-off', "depamre", "en route",
aeronautical information of a lasting character essential to "approach" or "landing" to indicate t h particular portion of
air navigation. flight to which the air traffic control clearance relates.
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 radio beacon
stations may also participate in this service on designated
distress and emergency frequencies.
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 groundbased
equipment to provide advice to the pilot on potential
conflicting aircraft that are equipped with SSR transponders.
Aircrafr. 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.
Air-ground communication. Two-way communication between
aircraft and stations or locations on the surface of the earth.
AIRMET information. Information issued by a meteoro-
Air t r a m control service. A service provided for the purpose
of:
a) preventing collisions:
1) between aircraft, and
2) on the manoeuvring area between aircraft and
obstructions; and
b) expediting and maintaining an orderly flow of air traffic.
Air traffic control unit. A generic term meaning variously, area
control centre, approach control unit or aerodrome control
tower.
Air t r a m flow management (ATFM). A service established
with the objective of contributing to a safe, orderly and
exwtious 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.
logical watch office concerning the occurrence or expected Air A generic term meaning variously, flight
occurrence of specified en-route weather phenomena which information service, alerting service, air traffic advisory
may affect the safety of low-level aircraft operations and service, air traffic control service (area control service,
which was not already included in the forecast issued for approach control service or aerodrome control service).
low-level flights in the flight information region concerned
or sub-area thereof.
Air t r a m services airspaces. Airspaces of defined dimen-
Air-taxiing. Movement of a helicopterNTOL above the surface sions, alphabetically designated, within which specific types
of an aerodrome, normally in ground effect and at a ground of flights may operate and for which air traffic services and
speed normally less than 37 km/h (20 kt). rules of operation are specified.
Note.- 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.
Air traffic. All aircraft in flight or operating on the manoeuvring
area of an aerodrome.
Air traffic advisory service. A service provided within advisory
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