Pilot/Controller Glossary
11/3/22
RANDOM ALTITUDE
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An altitude inappropriate
for direction of flight and/or not in accordance with
FAA Order JO 7110.65, paragraph 4
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5
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1, VER-
TICAL SEPARATION MINIMA.
RANDOM ROUTE
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Any route not established or
charted/published or not otherwise available to all
users.
RC
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(See ROAD RECONNAISSANCE.)
RCAG
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(See REMOTE COMMUNICATIONS
AIR/GROUND FACILITY.)
RCC
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(See RESCUE COORDINATION CENTER.)
RCO
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(See REMOTE COMMUNICATIONS OUTLET.)
RCR
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(See RUNWAY CONDITION READING.)
READ BACK
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Repeat my message back to me.
RECEIVER AUTONOMOUS INTEGRITY MON-
ITORING (RAIM)
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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
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A controller/facility
receiving control of an aircraft from another
controller/facility.
RECEIVING FACILITY
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(See RECEIVING CONTROLLER.)
RECONFORMANCE
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The automated process of
bringing an aircraft’s Current Plan Trajectory into
conformance with its track.
REDUCE SPEED TO (SPEED)
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(See SPEED ADJUSTMENT.)
REFINED HAZARD AREA (RHA)
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Used by ATC.
Airspace that is defined and distributed after a failure
of a launch or reentry operation to provide a more
concise depiction of the hazard location than a
Contingency Hazard Area.
(See AIRCRAFT HAZARD AREA.)
(See CONTINGENCY HAZARD AREA.)
(See TRANSITIONAL HAZARD AREA.)
REDUCED VERTICAL SEPARATION MINI-
MUM (RVSM) AIRSPACE
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RVSM airspace is
defined as any airspace between FL 290 and FL 410
inclusive, where eligible aircraft are separated
vertically by 1,000 feet. Authorization guidance for
operations in this airspace is provided in Advisory
Circular AC 91
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85.
REIL
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(See RUNWAY END IDENTIFIER LIGHTS.)
RELEASE TIME
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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]
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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 INFORMATION SERVICE
(RAIS)
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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
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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 emergen-
cy frequencies 121.5 MHz and 243.0 MHz.
(Refer to AIM.)
REMOTE COMMUNICATIONS OUTLET
(RCO)
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An unmanned communications facility
remotely controlled by air traffic personnel. RCOs
serve FSSs. Remote Transmitter/Receivers (RTR)
serve terminal ATC facilities. An RCO or RTR may
be UHF or VHF and will extend the communication
range of the air traffic facility. There are several
classes of RCOs and RTRs. The class is determined
by the number of transmitters or receivers. Classes A
through G are used primarily for air/ground purposes.
RCO and RTR class O facilities are nonprotected
outlets subject to undetected and prolonged outages.
RCO (O’s) and RTR (O’s) were established for the
express purpose of providing ground-to-ground
communications between air traffic control special-
ists and pilots located at a satellite airport for
delivering en route clearances, issuing departure
authorizations, and acknowledging instrument flight
rules cancellations or departure/landing times. As a
PCG R
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