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SSSAR
3 Strategic satellite system; also survivable strategic
satellite.
4 Stick-shaker speed.
5 Simulator-specific software.
6 System support segment [JSIPS].
SSSAR Spot/swath synthetic-aperture radar.
SSSC Single-sideband suppressed carrier.
SSSP Science-based stockpile stewardship program
(1991, NASA).
SS-SR Sunset to sunrise.
SSST 1 Solid-state star tracker.
2 Supersonic sea-skimming target.
SST 1 Supersonic transport.
2 Static-strength test(ing).
3 Static storage tank.
4 Standard serviceability test.
5 Single-subscriber terminal.
6 Solid-state transmitter [also SSTX].
7 Sidestick transducer.
8 Stores systems tester.
SSTD Solid-state towed decoy.
SSTDMA Satellite system TDMA.
SSTI Stabilized steerable thermal imaging.
SSTO Single stage to orbit.
S-stoff RFNA (G).
SSTOL Super-short, or supersonic and short, takeoff
and landing.
SSTS Space-based surveillance and tracking system, to
acquire and track PBVs, RVs and ASATs (SDI).
SSU 1 Signal summing unit.
2 Semiconductor storage unit.
3 Sensor surveying unit.
4 Subsequent signal unit.
SSULI Special sensor UV limb-imager.
SSUP Space station users panel (Int.).
SSUS Spinning solid upper stage.
SSUSI Special sensor UV spectrographic imager.
SSV Standard service volume (radio).
SSVT Satcom secure voice terminal.
SSW Swept square wave (ECM).
ST 1 Standard time.
2 Stairway (passenger, not powered).
3 Sharp-transition (VASI).
4 Single tandem [landing gear, eg C-130].
5 Strategic transport, air.
6 Static thrust; st is preferred.
7 Statistics.
S T 1 Area of horizontal tail.
2 Distance between centres of contact areas of tandem
wheels.
St 1 Stratus.
2 Stokes.
3 Stanton number.
4 Strouhal number (also S).
5 Static thrust.
S t Unit tensile stress.
st 1 Static thrust.
2 Stone.
STA 1 Service des Transports Aériens (F).
2 Station (also Sta), eg fuselage STA 307.8.
3 Supersonic transport aircraft (duplicates SST).
4 Static test article.
5 Straight-in approach (ICAO).
stability loop
6 Shuttle Training Aircraft, STA prefix for other
acronyms.
7 Structural test airframe (or article).
8 Section Technique de l’Armée.
9 Scheduled time of arrival.
10 Surveillance and target acquisition.
11 Satcom terminal assemblage.
12 Shuttle tile ablator; see *54.
Sta Station.
STAARTE Scientific training and access to aircraft for
atmospheric research throughout Europe.
STAB Stabilizer.
Stab 1 Staff, especially staff flight of four aircraft (G).
2 Steered agile beam.
stabbing Assembly process in which finished gas-turbine
stator blade (IGV) is fired at high speed through
unbroken ring to form tight-gripping joint.
stabbing band Narrow projecting band around rotating
part, eg turbine disc, from which metal can be removed
for dynamic balancing (now generally superseded).
STABE Second-time-around beacon echo.
stabilator Slab horizontal tail used as single primary
control (stabilizer/elevator). Normally pitch axis only, but
occasionally used to mean taileron (US usage).
stability Generally, quality of resisting disturbance from
existing condition and tendency to restore or return to
that condition when disturbance is removed. For aircraft,
meaning is confined to basic flight control and defined as
tendency to resume original (normally straight/level but
not necessarily) attitude after upset (rotation about any
axis); qualified according to axis and whether stick-fixed
or stick-free. See motion. For atmosphere, temperature
distribution such that particle tends to stay at original
level. For structure, ability to develop internal forces
resisting those externally applied. For materials other
than structural, usually ability to withstand harsh
environment (eg high temperature) without even gradual
physical or chemical change.
stability augmentation 1 Various species of auxiliary
subsystem added to primary flight-control system
(usually of helicopter, advanced aeroplane or spacecraft)
to achieve desired vehicle characteristics by selection of
variable gains in feedback loops from surfaces. In some
forms surfaces are commanded, eg yaw damper. Modern
fighters with relaxed longitudinal stability would be
dangerously unstable without **. Usually has limited
authority and does not move pilot’s controls.
2 Some authorities insist ** artificially improves
stability while retaining control in the hands of the human
pilot.
stability axes Introduced c 1939 to simplify calculation,
X-axis aligned with relative wind and remaining axes fixed
relative to body throughout subsequent disturbance.
Made redundant by computers.
stability derivatives See derivatives.
stability factor Ratio of change in transistor collector
current to change in I co (DC collector current for zero
emitted current).
stability limits 1 Forward and aft c.g. limits.
2 Extreme angles of incidence to which taxiing seaplane
can be trimmed without porpoising.
stability line Surge line.
stability loop Plot of limits of gas-turbine combustion,
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