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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
aprons.
Meteorological office. An office designated to provide
meteorological service for international air navigation.
Movement area. That part of an aerodrome to be used for the
take-off, landing and taxiing of aircraft, consisting of the
manoeuvring area and the apron(s).
NOTAM. A notice distributed by means of telecommunication
containing information concerning the establishment, condition
or change in any aeronautical facility, service,
procedure or hazard, the timely knowledge of which is
essential to personnel concerned with flight operations.
Operator. A person, organization or enterprise engaged in or
offering to engage in an aircraft operation.
Pilot-in-command. The pilot designated by the operator, or in
the case of general aviation, the owner, as being in command
and charged with the safe conduct of a flight.
Printed communications. Communications which automatically
provide a permanent printed record at each terminal of
a circuit of all messages which pass over such circuit.
Annex 11 — Air Traffic Services Chapter 1
1/11/01 1-6
Radiotelephony. A form of radiocommunication primarily
intended for the exchange of information in the form of
speech.
Reporting point. A specified geographical location in relation
to which the position of an aircraft can be reported.
Required navigation performance (RNP). A statement of the
navigation performance necessary for operation within a
defined airspace.
Note.— Navigation performance and requirements are
defined for a particular RNP type and/or application.
Rescue coordination centre. A unit responsible for promoting
efficient organization of search and rescue services and for
coordinating the conduct of search and rescue operations
within a search and rescue region.
RNP type. A containment value expressed as a distance in
nautical miles from the intended position within which
flights would be for at least 95 per cent of the total flying
time.
Example.— RNP 4 represents a navigation accuracy of plus
or minus 7.4 km (4 NM) on a 95 per cent containment basis.
Runway. A defined rectangular area on a land aerodrome
prepared for the landing and take-off of aircraft.
Runway visual range (RVR). The range over which the pilot
of an aircraft on the centre line of a runway can see the
runway surface markings or the lights delineating the
runway or identifying its centre line.
SIGMET 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 aircraft operations.
Significant point. A specified geographical location used in
defining an ATS route or the flight path of an aircraft and
for other navigation and ATS purposes.
Special VFR flight. A VFR flight cleared by air traffic control
to operate within a control zone in meteorological conditions
below VMC.
Station declination. An alignment variation between the zero
degree radial of a VOR and true north, determined at the
time the VOR station is calibrated.
Taxiing. Movement of an aircraft on the surface of an aerodrome
under its own power, excluding take-off and
landing.
Terminal control area. A control area normally established at
the confluence of ATS routes in the vicinity of one or more
major aerodromes.
Track. The projection on the earth’s surface of the path of an
aircraft, the direction of which path at any point is usually
expressed in degrees from North (true, magnetic or grid).
Traffic avoidance advice. Advice provided by an air traffic
services unit specifying manoeuvres to assist a pilot to
avoid a collision.
Traffic information. Information issued by an air traffic
services unit to alert a pilot to other known or observed air
traffic which may be in proximity to the position or
intended route of flight and to help the pilot avoid a
collision.
Transfer of control point. A defined point located along the
flight path of an aircraft, at which the responsibility for
providing air traffic control service to the aircraft is transferred
from one control unit or control position to the next.
Transferring unit. Air traffic control unit in the process of
transferring the responsibility for providing air traffic
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