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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 radar weather echo intensity for precipitation
into six levels. These levels are sometimes
expressed during communications as “VIP LEVEL”
1 through 6 (derived from the component of the radar
that produces the information− Video Integrator and
Processor). The following list gives the “VIP LEVELS”
in relation to the precipitation intensity within
a thunderstorm:
a. Level 1. WEAK
b. Level 2. MODERATE
c. Level 3. STRONG
d. Level 4. VERY STRONG
e. Level 5. INTENSE
f. Level 6. EXTREME
(Refer to AC 00-45, Aviation Weather Services.)
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.)
Pilot/Controller Glossary 2/17/05
PCG R−4
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.)
RANDOM ALTITUDE− An altitude inappropriate
for direction of flight and/or not in accordance with
FAAO 7110.65, Para 4−5−1, VERTICAL SEPARATION
MINIMA.
RANDOM ROUTE− Any route not established or
charted/published or not otherwise available to all
users.
RC−
(See ROAD RECONNAISSANCE.)
RCAG−
(See REMOTE COMMUNICATIONS
AIR/GROUND FACILITY.)
RCC−
(See RESCUE COORDINATION CENTER.)
RCO−
(See REMOTE COMMUNICATIONS OUTLET.)
RCR−
(See RUNWAY CONDITION READING.)
READ BACK− Repeat 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 without reference to
sensors or non-DoD integrity systems other than the
receiver itself. This determination is achieved by a
consistency check among redundant pseudorange
measurements.
RECEIVING CONTROLLER− A controller/facility
receiving control of an aircraft from another controller/
facility.
RECEIVING FACILITY−
(See RECEIVING CONTROLLER.)
RECONFORMANCE− The automated process of
bringing an aircraft’s Current Plan Trajectory into
conformance with its track.
REDUCE SPEED TO (SPEED)−
(See SPEED ADJUSTMENT.)
REIL−
(See RUNWAY END IDENTIFIER LIGHTS.)
RELEASE TIME− A departure time restriction
issued to a pilot by ATC (either directly or through an
authorized relay) when necessary to separate a
departing aircraft from other traffic.
(See ICAO term RELEASE TIME.)
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 AIRPORT ADVISORY (RAA)− A remote
service which may be provided by facilities,
which are not located on the landing airport, but have
a discrete ground−to−air communication frequency
or tower frequency when the tower is closed,
automated weather reporting with voice available to
the pilot at the landing airport, and a continuous
ASOS/AWOS data display, other direct reading
instruments, or manual observation is available to the
AFSS specialist.
REMOTE AIRPORT INFORMATION SERVICE
(RAIS)− A temporary service provided by facilities,
which are not located on the landing airport, but have
communication capability and automated weather
reporting available to the pilot at the landing airport.
REMOTE COMMUNICATIONS AIR/GROUND
FACILITY− An unmanned VHF/UHF transmitter/
receiver facility which is used to expand ARTCC
air/ground communications coverage and to facilitate
direct contact between pilots and controllers. RCAG
facilities are sometimes not equipped with emergency
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