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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.
IFR. The symbol used to designate the instrument flight rules.
IFR flight. A flight conducted in accordance with the
instrument flight rules.
IMC. The symbol used to designate instrument meteorological
conditions.
INCERFA. 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 Accident/Incident Reporting
Manual (ADREP Manual) (Doc 9156).
Instrument meteorological conditions (IMC). 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.
Integrity (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 office. 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
aprons.
Meteorological office. An office designated to provide
meteorological service for international air navigation.
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Annex 11 — Air Traffic Services Chapter 1
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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.
Obstacle. All fixed (whether temporary or permanent) and
mobile objects, or parts thereof, that are located on an area
intended for the surface movement of aircraft or that extend
above a defined surface intended to protect aircraft in
flight.
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.
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
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