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RFSS
RFSS 1 RF surveillance system.
2 Remote flight-service station.
RF surveillance Maintaining continuous monitor and
record of all hostile RFs.
RFT 1 Ready for training (US).
2 Request for tender.
3 Right first time.
RFTDL Rangefinder target-designator laser.
RFTP Request for technical proposal[s].
RFTR Ring-fin tail rotor.
RFTS 1 Robot flexible transfer system.
2 Reserve Flying Training School.
RFU Radar, or radio, frequency unit.
RFV Request for visit [by accredited foreign staff, eg
attaché].
RFY Reduced fission yield.
RG 1 Retractable gear.
2 Range (lights, ICAO).
3 Reconnaissance group.
4 Recombinant gas (accumulator).
5 Rotorcraft/gyroplane.
6 Regular General Aviation use.
R G Glide ratio.
RGB 1 Reduction-gearbox module.
2 Red/green/blue (systems identification and colour TV
tube).
3 Rail garrison basing.
RGC Radar graphics computer.
RGCS Review of the general concepts of separation
(ATC); P adds panel.
RGD Ragged.
RGF Range-gate filter.
RGL Runway guard light[s].
RGM US designation prefix: ship-launched surfaceattack
missile, also R gn (AIDU).
rgn Region (ICAO), also R gn (AIDU).
RGO Royal Greenwich Observatory.
RGPI/RGPO Random combination of RGPO and
range-gate pull-in; ECM technique calling for predictive
gate but effective against manual operator. Essentially
Ranrap.
RGPO Range gate pull-off.
RGPS Relative GPS.
RGS Recovery guidance system.
RGSI Radial groundspeed indicator (DME).
RGSN Homing radar system or beacon (R).
RGT 1 Remote ground terminal.
2 Reliability growth test.
rgt Right.
RGV Rotating guide vane.
RGWS Radar-guided weapon system.
RH, rh, r.h. 1 Right-hand.
2 Relative humidity.
3 Reheat.
4 Rotorcraft, helicopter.
5 Radio handler.
6 Rolled homogenous, see next.
RHA 1 Rolled homogenous armour.
2 Recording-head assembly.
RHAG Rotary hydraulic arresting gear.
RHAW Radar homing and warning; S adds system.
RHC Right-hand circuit.
Rhea, RHEA Role of the human in the evolution of
ATM (7) systems (Euret).
rib
rheostat Infinitely variable resistance for control of
current.
RHI 1 Range/height indicator (radar).
2 Relative-height indicator.
Rhino, RHINO Range/height indicator mode not operating.
RHL Rudder hinge line.
RHLP Rotatable horizontal log periodic.
RHO 1 Density of air or other medium (EDP), from
Greek.
2 Response on handoff.
rho Generalized term for radio-derived distance, usually
a radial distance from fixed station.
rhodium Rh, hard silvery metal, one use is electrode for
spark plugs, MPt 1,966°C, density 12.4.
rhombic aerial Short-wave directional aerial comprising
two dipoles forming horizontal rhombus emitting travelling
wave, thus having reflector at one end and
non-inductive resistance at other.
rhombus wing One whose section is symmetrical double
wedge, ie for supersonic flight only.
rho-rho Radio navaid giving distances from two fixed
stations, thus a radio fix.
rho-rho-rho Radio navaid, eg Omega, giving simultaneous
distances from three fixed stations.
rho-theta Radio navaid providing fix by one distance
from fixed station and also bearing from that station; not
normally written ρθ.
RHP Radar head processor.
RHS Right-hand seat, or side.
RHSM Reduced horizontal-separation minima.
RHTG Right-hand throttle grip.
Rhubarb Small-scale attack by fighters or fighterbombers
on enemy surface targets (esp. airfield[s]), using
cloud etc to achieve surprise (RAF, WW2).
rhumbatron Common type of resonant cavity.
rhumb line Line drawn on Earth cutting all meridians at
same angle.
rhumb-line course One flown at constant heading.
RHWR Radar homing and warning receiver.
RHWS Radar homing and warning system; basic part
of ECM kit of penetrating aircraft; also written RHAWS.
rhythmic light See code light, flashing beacon, occulting
light, [all now rare].
RI 1 Radar interrogator.
2 Remote indicator.
3 Radio-inertial (often R/I).
4 Root insert [747 wing].
5 Risk index.
6 Radiation intensity.
7 Right inboard.
R i Responce integral of structure in turbulence, i being
0, 2, 4, 6.
RIA 1 Range instrumentation aircraft.
2 Rapid inertial alignment.
3 Regulatory impact assessment (UK Cabinet Office),
examines effect of new legislation.
4 Radio interface adaptor (TRV).
RIAP Revised instrument approach procedure (usually
plural).
RIB 1 Rigid inflatable boat (RAF).
2 Right inboard.
3 Routeing information base.
rib 1 Primary structural member running across wing or
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