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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 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 traffic services reporting office. A unit established for the
purpose of receiving reports concerning air traffic services
and flight plans submitted before departure.
Chapter 1 Annex 11 — Air Traffic Services
1-3 1/11/01
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.
ALERFA. The code word used to designate an alert phase.
Alerting service. A service provided to notify appropriate
organizations regarding aircraft in need of search and
rescue aid, and assist such organizations as required.
Alert phase. A situation wherein apprehension exists as to the
safety of an aircraft and its occupants.
Alternate aerodrome. An aerodrome to which an aircraft may
proceed when it becomes either impossible or inadvisable
to proceed to or to land at the aerodrome of intended landing.
Alternate aerodromes include the following:
Take-off alternate. An alternate aerodrome at which an
aircraft can land should this become necessary shortly
after take-off and it is not possible to use the aerodrome
of departure.
En-route alternate. An aerodrome at which an aircraft
would be able to land after experiencing an abnormal or
emergency condition while en route.
ETOPS en-route alternate. A suitable and appropriate
alternate aerodrome at which an aeroplane would be
able to land after experiencing an engine shut-down or
other abnormal or emergency condition while en route
in an ETOPS operation.
Destination alternate. An alternate aerodrome to which an
aircraft may proceed should it become either impossible
or inadvisable to land at the aerodrome of intended
landing.
Note.— The aerodrome from which a flight departs may
also be an en-route or a destination alternate aerodrome for
that flight.
Altitude. The vertical distance of a level, a point or an object
considered as a point, measured from mean sea level.
Approach control service. Air traffic control service for
arriving or departing controlled flights.
Approach control unit. A unit established to provide air traffic
control service to controlled flights arriving at, or departing
from, one or more aerodromes.
Appropriate ATS authority. The relevant authority designated
by the State responsible for providing air traffic services in
the airspace concerned.
Apron. A defined area, on a land aerodrome, intended to
accommodate aircraft for purposes of loading or unloading
passengers, mail or cargo, fuelling, parking or maintenance.
Apron management service. A service provided to regulate
the activities and the movement of aircraft and vehicles on
an apron.
Area control centre. A unit established to provide air traffic
control service to controlled flights in control areas under
its jurisdiction.
Area control service. Air traffic control service for controlled
flights in control areas.
Area navigation (RNAV). A method of navigation which
permits aircraft operation on any desired flight path within
the coverage of station-referenced navigation aids or within
the limits of the capability of self-contained aids, or a
combination of these.
　
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