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Retimet
Retimet Patented (Dunlop) reticulated metal, lowdensity
3-D mesh of various metal strips or filaments.
retinal scanning display Mounted on pilot’s head and
projects pixels [of flight data] into pilot’s eye, focused at
infinity.
retirement Withdrawal of serviceable aircraft on
grounds of age, see next.
retirement life Aggregate of running time of engine or
other device at which decision is taken, usually by operator
but sometimes suggested by manufacturer, that
further overhauls are uneconomic; main reasons are obsolescence
of design or onset of fatigue problems.
retrace American term for flyback.
retractable Capable of being withdrawn into aircraft so
that it no longer protrudes, or protrudes only partially;
applies to many devices which are * into all parts of
aircraft, such as landing gear, inlet spikes, hooks, MAD
gear, Fowler flaps, spoilers, sensor pods, radars and,
formerly, gun turrets.
retractable ejector duct Two-position jet-engine reverser
for use in flight.
retraction lock Mechanical device to prevent inadvertent
retraction of landing gear; today is removable
but backed up by second lock actuated by compression of
undercarriage oleos.
retread crew Military flight crew returned to OCU after
tour of combat duty.
retreating blade That on side of a lifting rotor, eg on helicopter,
moving relative to aircraft in same sense as
slipstream; thus its airspeed is difference between its own
speed and true airspeed, which is normally positive at tip,
zero at a particular part-span radius and negative near
root. Inboard of zero-airspeed radius, airflow is from
trailing to leading edge.
retreating-blade stall Stall of retreating blade at high
helicopter forward speeds, when angle of attack of
retreating blade is excessive, especially towards tip;
exceeding flight-manual forward speed causes stall over
near-rectangular area of disc whose centre is behind c.g.
and thus effect is to cause nose-up roll towards retreating
side.
retrieval Mid-air snatch of parachuted load, eg spacecraft.
retrieve Task of following sailplane on cross-country to
goal, dismantling it and bringing it back in trailer.
retrievers Controller workstations in Comfile ATC
system which pass data and radar from Ethernet to operator
consoles.
retrimming 1 Adjustment of flight-control trim for
different flight condition [major error on takeoff can be
catastrophic].
2 Adjustment of engine trim to allow for deterioration
caused by deposits, erosion, birdstrikes and other factors.
retro Usually means retrofire or retrorocket.
retrofire To fire retrorocket.
retrofit Modification, esp. involving addition of new or
improved equipment, to item already in service; hence *
action, * mod.
retrograde 1 Orbit in direction different from normal; eg
of a planet apparently moving westward against fixed
stars.
2 Orbit in direction opposite to rotation of primary
body, eg Triton around Neptune or Earth satellite
reverberation time
launched at inclination from 180° through 270° to
360/000°.
3 In traffic direction opposite to normal, eg cargo of
military logistic type moving towards United States, or
military command away from enemy.
retroreflection Reflection, eg of EM radiation, parallel
to incident rays; hence retroreflector, device for accomplishing
same, eg corner reflector, Luneberg lens.
retrorocket Rocket fitted to vehicle to oppose forward
motion, eg to bring satellite out of orbit and back to
Earth. Loosely used to mean what are more precisely
called separation or staging motors or, on aircraft,
braking rocket.
retrosequence Event sequence before, during and after
retrofire.
retrothrust Thrust opposing motion; can be used for
aircraft reverse thrust.
Rets, RETS 1 Remote target system, or remoteequipment
target system.
2 Recent thunderstorm[s].
3 Radar extractor and tracking system.
return Echo (radar), esp. that due to clutter sources;
often plural.
return-flow Combustor in which incoming air and
issuing gas travel parallel in opposite directions; also
called reverse-flow.
return-flow tunnel Wind tunnel in which air is contained
in enclosed circuit.
return grab Returns shuttle of catapult (deck accelerator)
to start position.
return line 1 That traced on CRT by flyback.
2 Fluid pipe bringing fluid back from device to pump.
return load 1 That transmitted to aircraft by stopping
forward motion of action in gun, in direction opposite to
recoil.
2 Personnel and/or cargo to be transported by
returning carrier (DoD); ‘carrier’ means any vehicle, not
aircraft carrier.
return oil Scavenge oil; hence instrument showing *
temperature.
returns See return.
return to base Code: proceed to point indicated by
displayed information which is being used as point from
which aircraft can return to place where they can land;
command heading, speed and altitude may be used
(DoD).
REU Remote electronic[s] unit.
reusability Extent to which space hardware can be used
for repeated launches, especially if recovery is made from
desert or ocean.
REV Revision message.
rev. counter Tachometer.
Reveal Real-time electronic video enhancement at long
range.
Reven Reverser/variable exhaust nozzle.
revenue Air-carrier income from traffic sales.
revenue yield Rate per unit of traffic, eg cents per tonmile.
reverberation Persistence of sound in enclosed space as
result of continued multiple reflections, with or without
continued emission by source.
reverberation time Time between cut-off of source and
diminution of sound, measured as time-average of
acoustic energy density, to fall to 10 -6 of original.
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