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sinide
tensile filament, normally wound on a mandrel and
bonded with adhesive.
sinide Silicon nitride.
sink 1 Theoretical point in fluid flow at which fluid is
consumed at constant rate. The opposite of a source
2 Large mass to which waste heat can be rejected.
sinking Rapid uncontrolled increase in rate of descent
with little change in horizontal attitude, usually caused by
increasing AOA at approach to stall.
sinking speed Vertical component of velocity of aircraft
without propulsive or sustaining power in still air; for
glider or engine-out aeroplane, = TAS × sin gliding
angle = TAS ÷ glide ratio.
sink rate Rate of descent of free-fall unpowered liftingbody,
especially glider at best L/D. Usually same as
sinking speed. Often denoted, confusingly, by V s .
SINS, Sins Ship’s inertial navigation system (FBMS).
Sintac Système integre d’identification, de navigation,
de contrôle du trafic aérien, anti-collision et de communication
(F).
sintering Bonding powder or granules under heat and
pressure; no melting takes place and product may be
ceramic, cermet, metal or many other types of material,
and compact or having any desired degree of controlled
porosity. Related terms: diffusion bonding, hot isostatic
pressing, isothermal forging, powder metallurgy.
sinusoidal Having form of sine waves; characteristic of
SHM.
SIO, SI/O Special input/output.
SIOE Space and Information Operations Element
(USSPACECOM).
SIOM Standard input/output module.
SIOP Single integrated operational, or operating, plan
[use of NW] (UK, US).
SIOU Serial input/output unit (threat warning).
SIP 1 Surface-impact, or impulsion, propulsion.
2 Self-improver pilot.
3 Single inline package.
4 Stockpile, or system, improvement program.
5 Structural, or system[s] or subsystem[s], integrity
program.
6 Session initiation protocol.
Sipac Sindicato Italiano Piloti Aviazione Civile (I).
Sipaer Serviço de Investigação e Prevenção de
Acidentes Aeronauticos (Brazil).
siphoning Transfer of fluid out of container by suction,
possibly unwanted.
Sipri Stockholm International Peace Research
Institute.
Siprnet Secure international protocol router network
(DoD).
Sips, SIPS 1 Survey information processing system.
2 Small integrated propulsion system.
3 Software-intensive projects.
4 Structural-integration program[me] system.
SIPT Service instructor pilot training (RAF).
SIPU Super-integrated power unit, engine designed to
run on many fuels including MOM and MEPU.
SIR 1 Strip, inspect and rebuild.
2 Snow and ice on runway.
3 Search/interrogation radar.
4 Shuttle-imaging radar.
5 System integrated receiver (TJS).
6 Screening information request.
SITR
SIRA Sensor IR/acoustic.
Siral SAR2 interferometric radar altimeter.
SIRCM Pronounced surcom, suite of integrated IR
countermeasures.
SIRE Satellite IR experiment.
siren noise Caused by escape of air or gas under pressure
between fixed and rapidly moving apertures, such as
engine blading, successive pulses giving frequency.
SIRFC Suite of integrated RF countermeasures,
pronounced Surfac, sometimes written SIRFCM.
Sirias Synergistic integrated receiver techniques for
interference adaptation and suppression, for M-code GPS
(AFRL).
Sirocco Strong dust-laden wind [Mediterranean region].
Sirpa Service d’Information et de Relations Publiques
des Armées (F).
Sirs, SIRS 1 Signal-intelligence receiving system.
2 Satellite IR spectrometer.
3 Satcom interference response system, [defensive
counter-space] (AFSPC).
SIRST Surveillance IR search and track.
SIRTF Space [originally Shuttle] IR telescope facility.
SIRU Space inertial-reference unit.
SIS 1 Stall-identification [rarely, inhibition] system.
2 Standard instruction sheet.
3 Software-interface specification.
4 Semiconductor/insulator/semiconductor.
5 Signal in space.
6 Superheterodyne IFM subsystem.
7 Secret Intelligence Service.
8 Satellite interceptor system.
Sisal Single-assignment language.
SISC Standard Information Systems Center, part of
AFCAC (Gunter AFB).
SISCM Suite of integrated sensors and countermeasures.
SISD 1 Space Information Systems Division (USAF
Colorado Springs).
2 Single instruction, single data-stream.
SISO 1 Simulation Interoperability Standards Organization
(Int.).
2 Single input, single output.
SIT 1 Silicon-intensified target.
2 Selective-identification transponder.
3 Surplus-inventory tag.
4 Spontaneous-ignition temperature.
5 System integration [and] test.
6 Sydney Institute of Technology [NSW2006]
(Australia).
Sita Société Internationale de Téléecommunications
Aéronautiques [serves 680 air-transport organizations in
220 countries; head office, F-92522 Neuilly-sur-Seine)
(Int.).
site error Radio navaid inaccuracy caused by radiation
reaching destination by indirect, ie reflected, routes; eg
NDB or VOR radiation reflected from building near
beacon.
Sitelesc Syndicat des Industries de Tubes Electroniques
et Semi-Conducteurs (F).
SiTF See STF.
SITI Sold inside, ticketed inside (IATA, ISI).
SITO Sold inside, ticketed outside.
SITP System-integration test plan; /D adds description.
SITR System-integration test report.
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