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Note.— For measured positional data the accuracy is
normally expressed in terms of a distance from a stated
position within which there is a defined confidence of the true
position falling.
Advisory airspace. An airspace of defined dimensions, or
designated route, within which air traffic advisory service
is available.
Advisory route. A designated route along which air traffic
advisory service is available.
Aerodrome. A defined area on land or water (including any
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 traffic. All traffic on the manoeuvring area of an
aerodrome and all aircraft flying in the vicinity of
an aerodrome.
Annex 11 — Air Traffic Services Chapter 1
1/11/01 1-2
Note.— An aircraft is in the vicinity of an aerodrome when
it is in, entering or leaving an aerodrome traffic circuit.
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 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 radio beacon
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 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.
Air-ground communication. Two-way communication between
aircraft and stations or locations on the surface of the earth.
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.
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.
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
　
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