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Note.- The designation (RR) in these definitions indicates
a definition which has been extracted from the Radio
Regulations of the International Telecommunication Union
(ITLr) (see Handbook on Radio Frequency Spectrum Requirements
for Civil Aviation including Statement of Approved
ICAO Policies (Doc 9718)).
1.1 Definitions
When the following terms are used in the Standards and
Recommended Practices for Meteorological Service for
International Air Navigation, they have the following
meanings:
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 climatological summary. Concise summary of
specified meteorological elements at an aerodrome, based
on statistical data.
Aerodrome climatological table. Table providing statistical
data on the observed occurrence of one or more meteorological
elements at an aerodrome.
Aerodrome control tower. A unit established to provide air
traffic control service to aerodrome traffic.
Aerodrome elevation. The elevation of the highest point of the
landing area.
Aerodrome meteorological office. An office, located at an
aerodrome, designated to provide meteorological service
for international air navigation.
Aeronautical f i e d service (AFS). A telecommunication
service between specified fixed points provided primarily
for the safety of air navigation and for the regular, eficient
and economical operation of air services.
Aeronautical f i e d telecommunication network (AFTN). A
worldwide system of aeronautical fixed circuits provided,
as part of the aeronautical fixed service, for the exchange of
messages and/or digital data between aeronautical fixed
stations having the same or compatible communications
characteristics.
Aeronautical meteorological station. A station designated to
make observations and meteorological reports for use in
international 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 telecommunication station. A station in the
aeronautical telecommunication service.
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.
Aircraf2 observalion. The evaluation of one or more meteorological
elements made from an aircraft in flight.
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-repor& A report from an aircraft in flight prepared in
conformity with requirements for position, and operational
and/ or meteorological reporting.
Note.- Details of the AIREP fonn are given in the
PANS-ATM (DOC 4444).
Air traffic services unit. A generic term meaning variously, air
traffic control unit, flight information centre or air traffic
services reporting office.
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.
ANNEX 3
Annex 3 - Meteorological Service for International Air Navigation Chapter 1
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 impossible or
inadvisable to land at the aerodrome of intended
landing.
Note.- The aerodrome jhm which a flight departs may
　
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