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it is in, entering or leaving an aerodrome traffic circuit.
Aerodrome traffic zone. An airspace of defined dimensions
established around an aerodrome for the protection of
aerodrome traffic.
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 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.
Aeroplane. A power-driven heavier-than-air aircraft, deriving
its lift in flight chiefly from aerodynamic reactions on
surfaces which remain fixed under given conditions of
flight.
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.
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.
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 to reduce
ground effect turbulence or provide clearance for cargo
slingloads.
Annex 2 — Rules of the Air Chapter 1
1 54//1111/9/98 2
34
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 control clearance. Authorization for an aircraft to
proceed under conditions specified by an air traffic control
unit.
Note 1.— For convenience, the term “air traffic control
clearance” is frequently abbreviated to “clearance” when
used in appropriate contexts.
Note 2.— The abbreviated term “clearance” may be
prefixed by the words “taxi”, “take-off”, “departure”, “en
route”, “approach” or “landing” to indicate the particular
portion of flight to which the air traffic control clearance
relates.
Air traffic 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 traffic service. A generic term meaning variously, flight
information service, alerting service, air traffic advisory
service, air traffic control service (area control service,
approach control service or aerodrome control service).
Air traffic services airspaces. Airspaces of defined
dimensions, alphabetically designated, within which
specific types of flights may operate and for which air
traffic services and rules of operation are specified.
Note.— ATS airspaces are classified as Class A to G.
Air traffic services reporting office. A unit established for the
purpose of receiving reports concerning air traffic services
and flight plans submitted before departure.
Note.— An air traffic services reporting office may be
established as a separate unit or combined with an existing
unit, such as another air traffic services unit, or a unit of the
aeronautical information service.
Air traffic services unit. A generic term meaning variously, air
traffic control unit, flight information centre or air traffic
services reporting office.
Airway. A control area or portion thereof established in the
form of a corridor.
Alerting service. A service provided to notify appropriate
organizations regarding aircraft in need of search and
rescue aid, and assist such organizations as required.
Alternate aerodrome. An aerodrome to which an aircraft may
proceed when it becomes either impossible or inadvisable
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