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12/2/21 

Pilot/Controller Glossary 

RADAR ROUTE

 A flight path or route over which 

an aircraft is vectored. Navigational guidance and 
altitude assignments are provided by ATC. 

(See FLIGHT PATH.) 
(See ROUTE.) 

RADAR SEPARATION

 

(See RADAR SERVICE.) 

RADAR SERVICE

 A term which encompasses one 

or more of the following services based on the use of 
radar which can be provided by a controller to a pilot 
of a radar identified aircraft. 

a. 

Radar Monitoring

 The radar flight­following 

of aircraft, whose primary navigation is being 
performed by the pilot, to observe and note deviations 
from its authorized flight path, airway, or route. 
When being applied specifically to radar monitoring 
of instrument approaches; i.e., with precision 
approach radar (PAR) or radar monitoring of 
simultaneous ILS,RNAV and GLS approaches, it 
includes advice and instructions whenever an aircraft 
nears or exceeds the prescribed PAR safety limit or 
simultaneous ILS RNAV and GLS no transgression 
zone. 

(See ADDITIONAL SERVICES.) 
(See TRAFFIC ADVISORIES.) 

b. 

Radar Navigational Guidance

 Vectoring 

aircraft to provide course guidance. 

c. 

Radar Separation

 Radar spacing of aircraft in 

accordance with established minima. 

(See ICAO term RADAR SERVICE.) 

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 tower­controlled 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 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.) 

PCG R