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Resound
2 Magnetostrictive ferromagnetic rod excited to
respond at several distinct frequencies.
3 Lecher wire.
4 Piezoelectric crystal.
5 Acoustic enclosure having single-frequency response.
Resound Reduction of engine source noise through
understanding and novel design.
RESP Receiver/exciter/synchronizer processor.
Resp Responder; bcn adds beacon.
responder Receiving unit in transponder.
response A specialized aerospace meaning is rejection of
chaff or flare decoy by a missile seeker, which re-acquires
real target.
responsor Electronic device used to receive electronic
challenge and display a reply thereto (DoD).
RESS Radar emission, or environmental, simulator
system.
ressource “Sudden cabrage following a dive” [i.e., pull
out]; between the wars it was held there was no English
equivalent.
REST, Rest 1 Radar electronic scan technique;
spherical/planar lens array aerial, RF angle-error
sampling circuits, auto search/detection/confirmation,
and display/recording.
2 Re-entry environmental and systems technology.
rest angle Angular position of hinged surface when not
in use. May correctly incorporate slight offset, droop or
other departure from housed or neutral.
restart Start of burn after previous cutoff.
restart time Time between completion of adjustment of
tunnel model and taking first readings.
rest-EVA period Scheduled period in manned space
mission when in absence of assigned duties person may
rest or conduct EVA.
restitution Determination of true planimetric position
from reconnaissance photographs (NATO).
rest mass Mass of body when at rest (absolute in cosmological
term); other masses m = m o 1 (v 2 /c 2 ) where m o
is **, v is velocity and c is speed of light.
restoring couple Couple producing restoring moment.
restoring moment Moment generated by upset, ie rotary
excursion from original or desired condition, which tends
to restore original condition.
rest period Time on duty on ground during which flight
crew is relieved of all duties.
REST Radar electronic scan[ning] technique.
RESTR Restrict[ion].
restrained aircraft One undergoing dynamic structural
test or analysis, eg flutter, with one or more parts
anchored.
restraint 1 Standard series of tiedowns, webbing and
nylon-cord nets to prevent movement of bulk cargo.
2 Process of binding, lashing and wedging items into
one unit on to or into transport to ensure immobility
during transit (DoD), NATO).
3 Mechanical latching of container, pallet or other
ULD.
restricted airspace See restricted area.
restricted area 1 Airspace above surface area of
published dimensions within which flight of aircraft is
subject to restrictions caused, eg, by ‘unusual and often
invisible hazards’ such as AAA or SAM activity; in US
published in FAR 73, in UK by CAA and in all Notams,
charts and commercial publications. Denoted by R
Retils
followed by an identifying number, invariably in force SL
to 2743 m (9,000 ft).
2 Area where restrictions are in force to minimise interference
between friendly forces.
restricted burning See restricted propellant.
restricted data Those pertaining to design, manufacture
or use of NW, or special nuclear material.
restricted fire plan Safety measure for friendly aircraft
which establishes airspace ‘reasonably safe from friendly
surface-delivered non-nuclear fires’ (DoD).
restricted propellant Solid-propellant grain whose
surface is only partly available for ignition, remainder
being protected by restrictor.
restrictor Layer of solid-propellant fuel containing no
oxidant (oxidizer) or of non-combustible material bonded
firmly to inner surface of grain to prevent that part being
ignited except by flame travelling within propellant under
*.
restructurable Able to be rapidly modified [redesigned]
in flight to overcome dangerous problem, such as hardover
runaway (flight-control system).
resultant Sum of two or more vectors. Hence * action, *
force, * lift, * velocity.
RESYNC Resynchronize, resynchronizing.
RET 1 Rapid-exit taxiway.
2 Retired.
3 Reliability evaluation test.
ret NASA code for time between routine events.
retard 1 To cause piston engine ignition to occur later in
each cycle (normally still before TDC).
2 AT/SC mode in which throttles bleed off at
programmed rate during landing flare.
3 Displayed instruction to chop power to Flight Idle.
4 Mechanical block on forward movement of throttle
lever[s].
retardant Tailored additive to water dropped by firebomber
[several trade names].
retardation probe Tapering rod thrust into hydraulic
aperture to offer increasingly great resistance to carrier
arrester-wire pull-out.
retarded bomb Free-fall bomb with airbrakes, drogue,
parachute or other high-drag device deployed automatically
on release.
retarder parachute Small auxiliary parachute to pull
main-parachute rigging lines out in advance of canopy.
retention Maintenance of full design performance over
long period of service.
retention area Highly loaded parts of turbine or
compressor disc around blade roots.
reticle 1 Any kind of mark, such as black ring, illuminated
cross or ring of bright diamonds (to give three
examples) used to assist any form of optical aiming, eg
aerial gunnery, spacecraft docking or airdrop on marker.
2 In photogrammetry, cross or system of lines in image
plane of viewing apparatus used singly as reference mark
in monocular instruments or in pair to form floating
mark in certain stereoscopes (ASCC).
reticulated Having form of fine network; hence * plastic
or * foam are 3-D volumes of low-density fire-resistant
foam which can be foamed in place inside or outside fuel
tanks and other items to prevent build-up of fuel/air mix
and, even in presence of severe combat damage or postcrash
rupture, prohibit explosion or swift spread of fire.
Retils Rapid-exit taxiway indicator lighting system.
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