Aviation and air traffic control terminology · MLC-0104

Aviation and air traffic control terms: R (85)

RAD, see Route amendment dialog (RAD)
RadarA device that provides information on range, azimuth, and/or elevation of objects by measuring the time...
Radar advisoryThe provision of advice and information based on radar observations.
Radar altimeter, see Radio altimeter
Radar approachAn instrument approach procedure which utilizes Precision Approach Radar (PAR) or Airport Surveillance Radar...
Radar approach control facilityA terminal ATC facility that uses radar and nonradar capabilities to provide approach control services to...
Radar approach [ICAO]An approach, executed by an aircraft, under the direction of a radar controller.
Radar arrivalAn aircraft arriving at an airport served by a radar facility and in radar contact with the facility.
Radar beacon, see Radar
Radar clutter [ICAO]The visual indication on a radar display of unwanted signals.
Radar contacta. Used by ATC to inform an aircraft that it is identified using an approved ATC surveillance source on an...
Radar contact [ICAO]The situation which exists when the radar blip or radar position symbol of a particular aircraft is seen and...
Radar contact lostUsed by ATC to inform a pilot that the surveillance data used to determine the aircraft's position is no...
Radar environmentAn area in which radar service may be provided.
Radar flight followingThe observation of the progress of radar-identified aircraft, whose primary navigation is being provided by...
Radar [ICAO]A radio detection device which provides information on range, azimuth and/or elevation of objects.
Radar identificationThe process of ascertaining that an observed radar target is the radar return from a particular aircraft.
Radar identified aircraftAn aircraft, the position of which has been correlated with an observed target or symbol on the radar display.
Radar monitoring, see Radar service
Radar navigational guidance, see Radar service
Radar point outAn action taken by a controller to transfer the radar identification of an aircraft to another controller if...
Radar requiredA term displayed on charts and approach plates and included in FDC NOTAMs to alert pilots that segments of...
Radar routeA flight path or route over which an aircraft is vectored. Navigational guidance and altitude assignments are...
Radar separation, see Radar service
Radar serviceA term which encompasses one or more of the following services based on the use of radar which can be...
Radar service [ICAO]Term used to indicate a service provided directly by means of radar.
Radar service terminatedUsed by ATC to inform a pilot that he/she will no longer be provided any of the services that could be...
Radar surveillanceThe radar observation of a given geographical area for the purpose of performing some radar function.
Radar traffic advisoriesAdvisories issued to alert pilots to known or observed radar traffic which may affect the intended route of...
Radar traffic information service, see Traffic advisories
Radar vectoring [ICAO]Provision of navigational guidance to aircraft in the form of specific headings, based on the use of radar.
RadialA magnetic bearing extending from a VOR/VORTAC/TACAN navigation facility.
Radioa. A device used for communication.
Radio altimeterAircraft equipment which makes use of the reflection of radio waves from the ground to determine the height...
Radio beacon, see Nondirectional beacon
Radio detection and ranging, see Radar
Radio magnetic indicatorAn aircraft navigational instrument coupled with a gyro compass or similar compass that indicates the...
Radio-controlled (RC)The use of control signals transmitted radio to a remotely controlled device, as in radio-controlled model...
RAIS, see Remote airport information service (RAIS)
Ramp, see Apron
Random altitudeAn altitude inappropriate for direction of flight and/or not in accordance with FAA Order JO 7110.65...
Random routeAny route not established or charted/published or not otherwise available to all users.
RC, see Radio-controlled (RC); Road reconnaissance (RC)
RCAG, see Remote center air/ground facility (RCAG)
RCC, see Rescue coordination center (RCC)
RCO, see Remote communications outlet (RCO)
RCR, see Runway condition reading
Read backRepeat my message back to me.
Receiver autonomous integrity monitoring (RAIM)A technique whereby a civil GNSS receiver/processor determines the integrity of the GNSS navigation signals...
Receiving controllerA controller/facility receiving control of an aircraft from another controller/facility.
Receiving facility, see Receiving controller
ReconformanceThe automated process of bringing an aircraft's Current Plan Trajectory into conformance with its track.
Recreational flyerPilot of a UAS who is operating under 49 USC §44809, Exception for Limited Recreational Operations of...
Reduce speed to (speed), see Speed adjustment
Reduced vertical separation minimum (RVSM) airspaceRVSM airspace is defined as any airspace between FL 290 and FL 410 inclusive, where eligible aircraft are...
Refined hazard area (RHA)Used by ATC. Airspace that is defined and distributed after a failure of a launch or reentry operation to...
Release timeA departure time restriction issued to a pilot by ATC (either directly or through an authorized relay) when...
Release time [ICAO]Time prior to which an aircraft should be given further clearance or prior to which it should not proceed in...
Remote airport information service (RAIS)A temporary service provided by facilities, which are not located on the landing airport, but have...
Remote center air/ground facility (RCAG)An unmanned VHF/UHF transmitter/receiver facility which is used to expand ARTCC air/ground communications...
Remote communications outlet (RCO)An unmanned communications facility remotely controlled by air traffic personnel. RCOs serve FSSs. Remote...
Remote identification (RID)A system for electronic identification and secure oversight of UAS.
Remote pilotPilot of a UAS who is not operating as a recreational flyer under 49 USC §44809, the Exception for Limited...
Remote pilot in command (RPIC)The RPIC is directly responsible for and is the final authority as to the operation of the unmanned aircraft...
Remote transmitter/receiver (RTR), see Remote communications outlet (RCO)
ReportUsed to instruct pilots to advise ATC of specified information; e.g., “Report passing Hamilton VOR.”
Reporting pointA geographical location in relation to which the position of an aircraft is reported.
Reporting point [ICAO]A specified geographical location in relation to which the position of an aircraft can be reported.
Request full route clearanceUsed by pilots to request that the entire route of flight be read verbatim in an ATC clearance. Such request...
Required navigation performance (RNP)A statement of the navigational performance necessary for operation within a defined airspace. The following...
Reroute impact assessment (RRIA)A capability within the Traffic Flow Management System that is used to define and evaluate a potential...
Rescue coordination center (RCC)A search and rescue (SAR) facility equipped and manned to coordinate and control SAR operations in an area...
Rescue co-ordination centre [ICAO]A unit responsible for promoting efficient organization of search and rescue service and for coordinating the...
Resolution advisoryA display indication given to the pilot by the Traffic alert and Collision Avoidance System (TCAS II)...
Restricted area, see Special use airspace; Restricted area [ICAO]
Restricted area [ICAO]An airspace of defined dimensions, above the land areas or territorial waters of a State, within which the...
Resume normal speedUsed by ATC to advise a pilot to resume an aircraft's normal operating speed. It is issued to terminate a...
Resume own navigationUsed by ATC to advise a pilot to resume his/her own navigational responsibility. It is issued after...
Resume published speedUsed by ATC to advise a pilot to resume published speed restrictions that are applicable to a SID, STAR, or...
RHA, see Refined hazard area (RHA)
RID, see Remote identification (RID)
RMI, see Radio magnetic indicator
RNAV, see Area navigation (RNAV)
RNAV approachAn instrument approach procedure which relies on aircraft area navigation equipment for navigational guidance.
RNAV visual flight procedure (RVFP)An RVFP is a special visual flight procedure flown on an IFR flight plan. It is flown in visual conditions...
Road reconnaissance (RC)Military activity requiring navigation along roads, railroads, and rivers. Reconnaissance route/route...
RogerI have received all of your last transmission. It should not be used to answer a question requiring a yes or...
Rollout RVR, see Visibility
Rotor washA phenomenon resulting from the vertical down wash of air generated by the main rotor(s) of a helicopter.
RotorcraftA heavier-than-air aircraft that depends principally for its support in flight on the lift generated by one...
Round-robin flight planA single flight plan filed from the departure airport to an intermediary destination(s) and then returning to...
RouteA defined path, consisting of one or more courses in a horizontal plane, which aircraft traverse over the...
Route action notificationEDST notification that an ADR/ADAR/AAR has been applied to the flight plan.
Route amendment dialog (RAD)A capability within the Traffic Flow Management System that allows traffic management personnel to submit or...
Route segmentAs used in Air Traffic Control, a part of a route that can be defined by two navigational fixes, two NAVAIDs...
Route segment [ICAO]A portion of a route to be flown, as defined by two consecutive significant points specified in a flight plan.
RPIC, see Remote pilot in command (RPIC)
RRIA, see Reroute impact assessment (RRIA)
RSA, see Runway safety area
RunwayA defined rectangular area on a land airport prepared for the landing and takeoff run of aircraft along its...
Runway centerline lighting, see Airport lighting
Runway condition codes (RwyCC)Numerical readings, provided by airport operators, that indicate runway surface contamination (for example...
Runway condition readingNumerical decelerometer readings relayed by air traffic controllers at USAF and certain civil bases for use...
Runway condition report (RwyCR)A data collection worksheet used by airport operators that correlates the runway percentage of coverage along...
Runway end identifier lights (REIL), see Airport lighting
Runway entrance lights (REL)An array of red lights which include the first light at the hold line followed by a series of evenly spaced...
Runway gradientThe average slope, measured in percent, between two ends or points on a runway. Runway gradient is depicted...
Runway headingThe magnetic direction that corresponds with the runway centerline extended, not the painted runway number...
Runway [ICAO]A defined rectangular area on a land aerodrome prepared for the landing and takeoff of aircraft.
Runway in use/active runway/duty runwayAny runway or runways currently being used for takeoff or landing. When multiple runways are used, they are...
Runway lights, see Airport lighting
Runway markings, see Airport marking aids
Runway overrunIn military aviation exclusively, a stabilized or paved area beyond the end of a runway, of the same width as...
Runway profile descentAn instrument flight rules (IFR) air traffic control arrival procedure to a runway published for pilot use in...
Runway safety areaA defined surface surrounding the runway prepared, or suitable, for reducing the risk of damage to airplanes...
Runway status lights (RWSL) systemThe RWSL is a system of runway and taxiway lighting to provide pilots increased situational awareness by...
Runway transition, see Segments of a SID/STAR
Runway transition waypoint, see Segments of a SID/STAR
Runway use programA noise abatement runway selection plan designed to enhance noise abatement efforts with regard to airport...
Runway visual range (RVR), see Visibility
RVFP, see RNAV visual flight procedure (RVFP)
RwyCC, see Runway condition codes (RwyCC)
RwyCR, see Runway condition report (RwyCR)

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