(3)
An arriving VFR aircraft, receiving radar service to a tower-controlled airport within a Terminal Control Area, Terminal Radar Service Area, Airport Radar Service Area, or where Stage II service is provided, has landed; or to all other airports, is instructed to change to tower or advisory frequency.
(4) An aircraft completes a radar approach.
RADAR SURVEILLANCE - The radar observation of a given geographical area for the purpose of performing some radar function.
RADAR TRAFFIC ADVISORIES - Advisories issued to alert pilots to known or observed radar traffic which may affect the intended route of flight of their aircraft. (See Traffic Advisories)
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. (See Vector)
RADAR WEATHER ECHO INTENSITY LEVELS - Existing radar systems cannot detect turbulence. However, there is a direct correlation between the degree of turbulence and other weather features associated with thunderstorms, and the radar weather echo intensity. The National Weather Service has categorized six
(6) levels of radar weather echo intensity. The levels are sometimes expressed during communications as "VIP LEVEL" 1 through 6 (derived from the component of the weather radar that produces the information-Video Integrator and Processor). The following list gives the "VIP levels" in relation to precip intensity within a thunderstorm:
LEVEL 1. Weak
LEVEL 2. Moderate
LEVEL 3. Strong
LEVEL 4. Very strong
LEVEL 5. Intense
LEVEL 6. Extreme
RADIAL (P/CG) - A magnetic bearing extending from a VOR/VORTAC/TACAN navigation facility.
RADIAL (JCS) - A magnetic bearing extending from a Very High Frequency Omnirange/Tactical Air Navigation station.
RADIO -
(1) A device used for communication.
(2) Used to refer to a Flight Service Station, e.g., “Seattle Radio” is used to call Seattle Flight Service Station.
RADIO ALTIMETER/RADAR ALTIMETER - Aircraft equipment which makes use of the reflection of radio waves from the ground to determine the height of the aircraft above the surface.
RADIO BEACON (P/CG) - (See Non-Directional Beacon)
RADIO BEACON (JCS, NATO) - A radio transmitter which emits a distinctive or characteristic signal used for the determination of bearings, courses, or location.
RADIO MAGNETIC INDICATOR/RMI (P/CG) - An aircraft navigational instrument coupled with a gyro compass or similar compass that indicates the direction of a selected navigational aid and indicates bearing with respect to the heading of the aircraft.
RADIO MAGNETIC INDICATOR (JCS, NATO) - An instrument which displays aircraft heading and bearing to selected radio navigation aids.
RAMP - (See Apron)
RAPID - Used in Meteorological messages (See Landing Forecast Trend type).
RAPID EXIT TAXIWAY INDICATOR LIGHTS - (See Airport Lighting)
READBACK (P/CG) - Repeat my message back to me.
READBACK (ICAO) - A procedure whereby the receiving station repeats a received message or an appropriate part thereof back to the transmitting station so as to obtain confirmation of correct reception.
RECEIVING CONTROLLER/FACILITY - A controller/facility receiving control of an aircraft from another controller/facility.
RECEIVING UNIT/CONTROLLER (ICAO) - Air Traffic Services unit/Air Traffic Controller to which a message is sent.
REDUCE SPEED TO (SPEED) - (See Speed Adjustment)
RELEASE TIME (P/CG) - A departure time restriction issued to a pilot by Air Traffic Control when necessary to separate a departing aircraft from other traffic.
RELEASE TIME (ICAO) - Time prior to which an aircraft should be given further clearance or prior to which it should not proceed in case of radio failure.
REMOTE COMMUNICATION AIR/GROUND FACILITY/RCAG - An unmanned Very High Frequency/Ultra High Frequency transmitter/receiver facility which is used to expand Air Route Traffic Center air/ground communications coverage and to facilitate direct contact between pilots and controllers. RCAG facilities are sometimes not equipped with emergency frequencies
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