Pilot/Controller Glossary

RADAR SERVICE [ICAO]- Term used to indicate a service provided directly by means of radar.
a. Monitoring- The use of radar for the purpose of providing aircraft with information and advice relative
to significant deviations from nominal flight path.
b. Separation- The separation used when aircraft position information is derived from radar sources.
RADAR SERVICE TERMINATED- Used by ATC to inform a pilot that he/she will no longer be provided any
of the services that could be received while in radar contact. Radar service is automatically terminated, and the
pilot is not advised in the following cases:
a. An aircraft cancels its IFR flight plan, except within Class B airspace, Class C airspace, a TRSA, or where
Basic Radar service is provided.
b. An aircraft conducting an instrument, visual, or contact approach has landed or has been instructed to
change to advisory frequency.
c. An arriving VFR aircraft, receiving radar service to a tower-controlled airport within Class B airspace,
Class C airspace, a TRSA, or where sequencing service is provided, has landed; or to all other airports, is
instructed to change to tower or advisory frequency.
d. 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.
RADIAL- A magnetic bearing extending from a VOR/VORTAC/TACAN navigation facility.
RADIO-
a. A device used for communication.
b. Used to refer to a flight service station; e.g., "Seattle Radio" is used to call Seattle FSS.
RADIO 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-
(See NONDIRECTIONAL BEACON.)

RADIO-CONTROLLED (RC)- The use of control signals transmitted radio to a remotely controlled device,
as in radio-controlled model airplanes.
RADIO DETECTION AND RANGING-
(See RADAR.)

RADIO MAGNETIC INDICATOR- An aircraft navigational instrument coupled with a gyro compass or similar
compass that indicates the direction of a selected NAVAID and indicates bearing with respect to the heading of
the aircraft.
RAIS-
(See REMOTE AIRPORT INFORMATION SERVICE.)

RAMP-
(See APRON.)