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RADAR: Radio Detection And Ranging.

RADIAL: A magnetic bearing extending from a VOR station

RADIAL CAPTURE: An autopilot's smooth transition and lock-on to a preset VOR radial.

RADIO RANGE: An early navigation system that used AM radio beams to define airways.

RADOME: Any housing that shields a radar antenna from moving air. Refers to ground-based as well as aircraft-based housings.

RAMP: See "apron".

RANGE GATE: A radar receiver clutter-reducing feature that rejects targets closer to or further from the edges of the range gate circuit setting. Adjustable in both distance and width.

RAT: Ram Air Turbine. A deployable small generator driven by a small propeller, the purpose of which is to provide emergency electrical power in the event of total engine failure.

RATO: Rocket Assisted Take Off. See "JATO". RATO has the same goal but uses a liquid fueled strapon pack.

RCV: Abbreviation of "receive".

REDLINE: See "VNE".

REIL: Runway End Identifier Lights, a pair of white flashing strobe lights located at each corner of the end of a runway

RELATIVE WIND: The direction and velocity of airflow as measured at the leading edge of the mean span of the wing.

RETREATING BLADE STALL: See "blade stall".

REVERTED RUBBER SKID: A wheel skid induced by tiny ball-bearing-like pieces of rubber scrubbed off the surface of a tire when the brakes "lock up". It has the same effect as "hydroplaning".

RMI: Radio Magnetic Indicator, an aircraft navigation instrument coupled with a gyro compass that indicates the direction to a navaid plus bearing with respect the aircraft heading

ROLL: To rotate an aircraft about its longitudinal axis. May also refer to beginning a takeoff, as in "American two seventy five heavy, rolling."

ROLL CLOUD: See "rotor cloud".

ROTATION: The raising of the nose during takeoff to cause the aircraft to "unstick", i.e. to rise from the runway. Its landing counterpart is the "flare".

ROTOR CLOUD: The visible evidence of a "mountain rotor".

RPM HANG-UP: An undersireable turbine engine startup condition in which N1 fails to build to normal ground idle, usually as the result of a "hot start".

RUN-ON LANDING: A helicopter landing technique in which the aircraft is not brought to a hover but instead lands with some forward motion.

RUNWAY HEADING: the exact magnetic heading of the runway centerline to the nearest degree

RUNWAY NUMBER: determined from the runway magnetic heading rounded to the nearest ten degrees (i.e., a runway with a heading of 274 degrees would be runway 27)

RVR: Runway Visual Range, the distance that a pilot can see down the runway from the approach end; needed for instrument landings in reduced visibility

RX: Teletype jargon for "receive".


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