Pilot/Controller Glossary Pilot/Controller Glossary  8/15/19 7/16/20  R  RADAR- A device that provides information on  range, azimuth, and/or elevation of objects by  measuring the time interval between transmission  and reception of directional radio pulses and  correlating the angular orientation of the radiated  antenna beam or beams in azimuth and/or elevation $_{ }$ a.  Primary Radar- A radar system in which a  minute portion of a radio pulse transmitted from a site  is reflected by an object and then received back at that  site for processing and display at an air traffic control  facility.  b.  Secondary Radar/Radar Beacon (ATCRBS)- A  radar system in which the object to be detected is  fitted with cooperative equipment in the form of a  radio receiver/transmitter (transponder). Radar  pulses transmitted from the searching transmitter/re- ceiver (interrogator) site are received in the  cooperative equipment and used to trigger a  distinctive transmission from the transponder. This  reply transmission, rather than a reflected signal, is  then received back at the transmitter/receiver site for  processing and display at an air traffic control facility.  RADAR [ICAO]- A radio detection device which  provides information on range, azimuth and/or  elevation of objects.  a.  Primary Radar- Radar system which uses  reflected radio signals.  b.  Secondary Radar- Radar system wherein a  radio signal transmitted from a radar station initiates  the transmission of a radio signal from another  station.  RADAR ADVISORY- The provision of advice and  information based on radar observations.  (See ADVISORY SERVICE.)  (See COOPERATIVE SURVEILLANCE.)  (See INTERROGATOR.)  (See NON-COOPERATIVE SURVEILLANCE.)  (See TRANSPONDER.)  (See ICAO term RADAR.)  (Refer to AIM.)  RADAR ALTIMETER- (See RADIO ALTIMETER.)  RADAR APPROACH- An instrument approach  procedure which utilizes Precision Approach Radar  (PAR) or Airport Surveillance Radar (ASR).  (See AIRPORT SURVEILLANCE RADAR.)  (See INSTRUMENT APPROACH  PROCEDURE.)  (See PRECISION APPROACH RADAR.)  (See SURVEILLANCE APPROACH.)  (See ICAO term RADAR APPROACH.)  (Refer to AIM.)  RADAR APPROACH [ICAO]- An approach,  executed by an aircraft, under the direction of a radar  controller.  RADAR APPROACH CONTROL FACILITY- A  terminal ATC facility that uses radar and nonradar  capabilities to provide approach control services to  aircraft arriving, departing, or transiting airspace  controlled by the facility.  (See APPROACH CONTROL SERVICE.)  a.  Provides radar ATC services to aircraft  operating in the vicinity of one or more civil and/or  military airports in a terminal area. The facility may  provide services of a ground controlled approach  (GCA); i.e., ASR and PAR approaches. A radar  approach control facility may be operated by FAA,  USAF, US Army, USN, USMC, or jointly by FAA  and a military service. Specific facility nomencla- tures are used for administrative purposes only and  are related to the physical location of the facility and  the operating service generally as follows:  1.  Army Radar Approach Control (ARAC)  (US Army).  2.  Radar Air Traffic Control Facility (RATCF)  (USN/FAA and USMC/FAA).  3.  Radar Approach Control (RAPCON)  (USAF/FAA, USN/FAA, and USMC/FAA).  4.  Terminal Radar Approach Control (TRACON) (FAA).  5.  Airport Traffic Control Tower (ATCT)  (FAA). (Only those towers delegated approach  control authority.)  RADAR ARRIVAL- An aircraft arriving at an  airport served by a radar facility and in radar contact  with the facility.  (See NONRADAR.)  PCG R-1 