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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
(MSL).
Approach control unit. A unit established to provide air traffic
control service to controlled flights amving 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.
Area control centre. A unit established to provide air traffic
control service to controlled flights in control areas under
its jurisdiction.
Automatic dependent surveillance (ADS). A surveillance
technique in which aircraft automatically provide, via a
data link, data derived from on-board navigation and
position-fixing systems, including aircraft identification,
four-dimensional position and additional data as
appropriate.
Briefing. Oral commentary on existing and/or expected
meteorological conditions. '
Cloud of operational significance. A cloud with the height of
cloud base below 1 500 m (5 000 ft) or below the highest
minimum sector altitude, whichever is greater.
Consultation. Discussion with a meteorologist or another
qualified person of existing and/or expected meteorological
conditions relating to flight operations; a discussion
includes answers to questions.
Control area. A controlled airspace extending upwards from a
specified limit above the earth.
Cruising level. A level maintained during a significant portion
of a flight.
Elevation. The vertical distance of a point or a level, on or
affixed to the surface of the earth, measured from mean sea
level.
Extended range operation. Any flight by an aeroplane with
two turbine power-units where the flight time at the one
power-unit inoperative cruise speed (in ISA and still air
conditions), from a point on the route to an adequate
alternate aerodrome, is greater than the threshold time
approved by the State of the Operator.
Plight crew member. A licensed crew member charged with
duties essential to the operation of an aircraft during a flight
duty period.
Flight documentation. Written or printed documents,
including charts or forms, containing meteorological
information for a flight.
.Flight information centre. A unit established to provide flight
information service and alerting service.
Flight information region. An airspace of defined dimensions
within which flight information service and alerting service
are provided.
Flight level. A surface of constant atmospheric pressure which
is related to a specific pressure datum, 1 013.2 hectopascals
@Pa), and is separated from other such surfaces by specific
pressure intervals.
Note 1.- A pressure type altimeter calibrated in
accordance with the Standard Atmosphere:
a) when set to a QNH altimeter setting, will indicate
altitude;
b) when set to a QFE altimeter setting, will indicate height
above the QFE refrence datum; and
c) when set to a pressure of 1 013.2 hPa, may be used to
indicate flight levels.
Note 2.- The term "height" and "altitude", used in
Note I , indicate altimetric rather than geometric heights and
altitudes.
Forecast. A statement of expected meteorological conditions
for a specified time or period, and for a specified area or
portion of airspace.
GAMET area forecast. An area forecast in abbreviated plain
language for low-level flights for a flight information
region or sub-area thereof, prepared by the meteorological
office designated by the meteorological authority concerned
and exchanged with meteorological offices in
adjacent flight information regions, as agreed between the
meteorological authorities concerned.
Chapter 1 Annex 3 - Meteorological Service for International Air Navigation
Gridpoint data in digital form. Computer processed meteorological
data for a set of regularly spaced points on a chart,
for transmission from a meteorological computer to another
computer in a code form suitable for automated use.
Note.- In most cases such data are transmitted on medium
or high speed telecommunications channels.
Height. The vertical distance of a level, a point or an object
considered as a point, measured from a specified datum.
Human Factors principles. Principles which apply to
aeronautical design, certification, training, operations and
maintenance and which seek safe interface between the
human and other system components by proper
consideration to human performance.
　
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