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 co-ordination centre. A unit responsible for promoting efficient organization of search and rescue service and for co-ordinating the conduct of search and rescue operations within a search and rescue region.
No. 3
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.
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-holding position. A designated position intended to protect a runway, an obstacle limitation surface, or an ILS/MLS critical/sensitive area at which taxiing aircraft and vehicles shall stop and hold, unless otherwise authorized by the aerodrome control tower.
Runway visual range. 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.
Secondary radar. A radar system wherein a radio signal transmitted from the radar station initiates the transmission of a radio signal from another station.
Secondary surveillance radar (SSR). A surveillance radar system which uses transmitters/receivers (interrogators) and transponders.
Segregated parallel operations. Simultaneous operations on parallel or near-parallel instrument runways in which one runway is used exclusively for approaches and the other runway is used exclusively for departures.
Sending unit/controller. Air traffic services unit/air traffic controller transmitting a message.
Note.— See definition of “receiving unit/controller”.
Shoreline. A line following the general contour of the shore, except that in cases of inlets or bays less than 30 nautical miles in width, the line shall pass directly across the inlet or bay to intersect the general contour on the opposite side.
SIGMET information. Information issued by a meteorological watch office concerning the occurrence or expected occur-rence of specified en-route weather phenomena which may affect the safety of aircraft operations.
I. Definitions 1-11
Signal area. An area on an aerodrome used for the display of ground signals.
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