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link for ATC communications.
Control zone. A controlled airspace extending upwards from ends at a point in the vicinity of an aerodrome from which:
the surface of the earth to a specified upper limit.
1) a landing can be made; or
* All IS0 Standards are listed at the end of this chapter. 2) a missed approach procedure is initiated.
Chapter I Annsx I1 -Air Traffic Services
Flight crew member. A licensed crew member charged with
duties essential to the operation of an aircraft during a flight
duty period.
Flight informafion 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 information service. A service provided for the purpose
of giving advice and information useful for the safe and
efficient conduct of flights.
Flight level. A surface of constant atmospheric pressure which
is related to a specific pressure datum, 1 013.2 hectopascals
(hPa), 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 reference datum;
C) when set to a pressure of 1 013.2 hPa, may be used to
indicate flight levels.
Note 2.- The terms "height" and "altitude", used in
Note 1 above, indicate altimetric rather than geometric heights
and altitudes.
Flight plan. Specified information provided to air traffic
services units, relative to an intended flight or portion of a
flight of an aircraft.
Note.- Specifications for flight plans are contained in
Annex 2. When the expression "jlight plan form" is used it
denotes the model flight plan form at Appendix 2 to the
PANS-ATM.
Forecast. A statement of expected meteorological conditions
for a specified time or period, and for a specified area or
portion of airspace.
Geodetic datum. A minimum set of parameters required to
define location and orientation of the local reference system
with respect to the global reference systernlframe.
Gregorian calendar. Calendar in general use; first introduced
in 1582 to define a year that more closely approximates the
tropical year than the Julian calendar (IS0 19 log*).
Note.- In the Gregorian calendar, common years have 365
days and leap years 366 days divided into twelve sequential
months.
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.
Human performance. Human capabilities and limitations
which have an impact on the safety and efficiency of
aeronautical operations.
ZFR. The symbol used to designate the instrument flight rules.
ZFR flight. A flight conducted in accordance with the
instrument flight rules.
ZMC. The symbol used to designate instrument meteorological
conditions.
ZNCERFA. The code word used to designate an uncertainty
phase.
Incident. An occurrence, other than an accident, associated
with the operation of an aircraft which affects or could
affect the safety of operation.
Note.- The types of incidents which are of main interest to
the International Civil Aviation Organization for accident prevention
studies are listed in the AccidentlIncident Reporting
Manual (ADREP Manual) (Doc 9156).
Instrument meteorological conditions (ZMC). Meteorological
conditions expressed in terms of visibility, distance from
cloud, and ceiling, less than the minima specified for visual
meteorological conditions.
Note.- The specified minima for visual meteorological
conditions are contained in Annex 2.
Zntegriry (aeronautical data). A degree of assurance that an
aeronautical data and its value has not been lost nor altered
since the data origination or authorized amendment.
International NOTAM o m e . An office designated by a State
for the exchange of NOTAM internationally.
LeveL A generic term relating to the vertical position of an
aircraft in flight and meaning variously, height, altitude or
flight level.
Manoeuvring area. That part of an aerodrome to be used for
the take-off, landing and taxiing of aircraft, excluding
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