RADAR (ICAO) - A radio detection device which provides information on range, azimuth and/or elevation of objects.

(1)
PRIMARY RADAR - A radar system which uses reflected radio signals.

(2)
SECONDARY RADAR - A radar system wherein a radio signal transmitted from a radar station initiates the transmission of a radio signal from another station.

RADAR (JCS) - A radio detection device which provides information on range, azimuth and/or elevation of objects.
RADAR ADVISORY (P/CG, JCS) - The provision of advice and information based on radar observations. (See Advisory Service)
RADAR APPROACH (P/CG) - An instrument approach procedure which utilizes Precision Approach Radar (PAR) or Airport Surveillance Radar (ASR). (See PAR Approach, Surveillance Approach, Airport Surveillance Radar, Precision Approach Radar, Instrument Approach Procedure)
RADAR APPROACH (ICAO) - An approach, executed by an aircraft, under the direction of a radar controller.
RADAR APPROACH CONTROL FACILITY - A terminal Air Traffic Control facility that uses radar and non-radar capabilities to provide Approach Control service to aircraft arriving, departing, or transiting airspace controlled by the facility (see Approach Control Service). Provides radar Air Traffic Control service 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 Control Approach (GCA); i.e., Airport Surveillance Radar and Precision Approach Radar approaches. A radar Approach Control facility may be operated by Federal Aviation Administration, US Air Force, US Army, US Navy, US Marine Corps, or jointly by Federal Aviation Administration and a military service. Specific facility nomenclatures are used for administrative purposes only and are related to the physical location of the facility and the operating service generally as follows:
Army Radar Approach Control/ARAC (Army)
Radar ATC
Facility/RATCF (Navy/Federal Aviation Administration)
Radar Approach Control/RAPCON (Air Force/Federal
Aviation Administration)
Terminal Radar Approach Control/TRACON
(Federal Aviation Administration)
Tower/Airport Traffic Control Tower/ATCT (Federal Aviation
Administration)
(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 Non-radar Arrival)
RADAR BEACON - (See Radar)
RADAR BEACON (JCS) - A receiver/transmitter combination which sends out a coded signal when triggered by the proper type of pulse, enabling determination of range and bearing information by the interrogating station or aircraft.
RADAR CLUTTER (ICAO) - (See Clutter)
RADAR CONTACT (P/CG) -
(1)
Used by Air Traffic Control to inform an aircraft that it is identified on the radar display and radar flight following will be provided until radar identification is terminated. Radar service may also be provided within the limits of necessity and capability. When a pilot is informed of “radar contact” he automatically discontinues reporting over Compulsory Reporting Points. (See Radar Flight Following Radar Contact Lost, Radar Service, Radar Service Terminated).

(2)
A term used to inform the controller that the aircraft is identified and approval is granted for the aircraft to enter the receiving controller's airspace.

RADAR CONTACT (ICAO) - The situation which exists when the radar blip of a particular aircraft is seen and identified on a radar display.
RADAR CONTACT LOST - Used by Air Traffic Control to inform a pilot that radar data used to determine the aircraft's position is no longer being received, or is no longer reliable and radar service is no longer being provided. The loss may be attributed to several factors including the aircraft merging with weather or ground clutter, the aircraft operating below radar line of sight coverage, the aircraft entering an area of poor radar return, failure of the aircraft transponder, or failure of the ground radar equipment. (See Clutter, Radar Contact)
　
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