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stations may also participate in this service on designated
distress and emergency frequencies.
Aeronautical station (RR SZ.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 station. A station in the
aeronautical telecommunication service.
Airborne colliswn 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 communication. Two-way communication between
aircraft and stations or locations on the surface of the earth.
AZRMET 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.
Air-taxiing. Movement of a helicopterNTOL above the surface
of an aerodrome, normally in ground effect and at a ground
speed normally less than 37 kmlh (20 kt).
Note.- The actual height may vary, and some helicopters
may require air-taxiing above 8 m (253) AGL to reduce ground
effect turbulence or provide clearance for cargo slingloads.
Air tmffic. All aircraft in flight or operating on the manoeuvring
area of an aerodrome.
Air mffi 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 trafic 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-of', "departure", "en
route", "approach" or "landing" to irulicute the purticular
portion of flight to which the air trafic 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 tram control unit. A generic term meaning variously,
area control centre, approach control unit or aerodrome
control tower.
Air traflc flow management (ATFM). 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 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 as
shown in Appendix 4.
Air tmffic services reporting office. A unit established for the
purpose of receiving reports concerning air traffic services
and flight plans submitted before departure.
Chapter I Annex 11 -Air Traffic Services
Note.- An clir traffic services reporting office may be
establzshed as a separate utilt or combined with an existing
unit, such as another air traffic services unit, or a unit of the
aeronauticnl 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.
ALERFA. The code word used to designate an alert phase
Alerting service. A service provided to notify appropriate
　
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