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direction to permit the aircraft to intercept and proceed
along the reciprocal of the designated track.
Note 1.— Procedure turns are designated “left” or
“right” according to the direction of the initial turn.
Note 2.— Procedure turns may be designated as being
made either in level flight or while descending, according
to the circumstances of each individual procedure.
Profile. The orthogonal projection of a flight path or portion
thereof on the vertical surface containing the nominal
track.
PSR blip. The visual indication, in non-symbolic form, on a
radar display of the position of an aircraft obtained by
primary radar.
Radar. A radio detection device which provides information
on range, azimuth and/or elevation of objects.
Radar approach. An approach in which the final approach
phase is executed under the direction of a radar controller.
* As defined in Annex 8.
1-10 Air Traffic Management (PANS-ATM)
1/11/01
Radar clutter. The visual indication on a radar display of
unwanted signals.
Radar contact. The situation which exists when the radar
position of a particular aircraft is seen and identified on a
radar display.
Radar control. Term used to indicate that radar-derived
information is employed directly in the provision of air
traffic control service.
Radar controller. A qualified air traffic controller holding a
radar rating appropriate to the functions to which he is
assigned.
Radar display. An electronic display of radar-derived information
depicting the position and movement of aircraft.
Radar identification. The situation which exists when the
radar position of a particular aircraft is seen on a radar
display and positively identified by the air traffic
controller.
Radar map. Information superimposed on a radar display to
provide ready indication of selected features.
Radar monitoring. The use of radar for the purpose of
providing aircraft with information and advice relative to
significant deviations from nominal flight path, including
deviations from the terms of their air traffic control
clearances.
Radar position indication (RPI). The visual indication, in
non-symbolic and/or symbolic form, on a radar display of
the position of an aircraft obtained by primary and/or
secondary surveillance radar.
Radar position symbol (RPS). The visual indication, in
symbolic form, on a radar display, of the position of an
aircraft obtained after automatic processing of positional
data derived from primary and/or secondary surveillance
radar.
Radar separation. The separation used when aircraft position
information is derived from radar sources.
Radar service. Term used to indicate a service provided
directly by means of radar.
Radar track position. An extrapolation of aircraft position by
the computer based upon radar information and used by
the computer for tracking purposes.
Note.— In some cases, information other than radarderived
information is used to assist the tracking
processes.
Radar unit. That element of an air traffic services unit which
uses radar equipment to provide one or more services.
Radar vectoring. Provision of navigational guidance to
aircraft in the form of specific headings, based on the use
of radar.
Receiving unit/controller. Air traffic services unit/air traffic
controller to which a message is sent.
Note.— See definition of “sending unit/controller”.
Repetitive flight plan (RPL). A flight plan related to a series
of frequently recurring, regularly operated individual
flights with identical basic features, submitted by an
operator for retention and repetitive use by ATS units.
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.
Rescue unit. A unit composed of trained personnel and
provided with equipment suitable for the expeditious
conduct of search and rescue.
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.
　
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