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3 Straight-in (approach).
4 Spark-ignited, or ignition.
5 Single [or spark].
6 Standby instrument[s].
7 Supporting interrogator.
8 Surveillance [and] intelligence.
9 Suomen Ilmaluliitto, aeronautical association
(Finland).
10 Selective interrogator.
Si 1 Silicon.
2 On an oil analysis = dirt, foreign matter.
S i Imposed stress in fatigue calculation.
Si 3 N 4 Silicon nitride.
SIA 1 Structural-integrity audit.
2 Service de l’Information Aéronautique (F).
3 Semiconductor Industry Association (US).
4 Silent Aircraft Initiative, 2005 (BA/Boeing / CAA /
Cranfield / Marshall / NATS / Rolls-Royce).
SIAE Salons Internationaux de l’Aéronautique et de
l’Espace (F).
SIAG Salons Internationaux de l’Aviation Générale
(F).
Sialon Silicon-aluminium-oxinitride.
Siam Self-initiated anti-aircraft missile; carries out IFF
interrogation and handles subsequent interception automatically.
siamese To join two similar items into single paired unit
or to bifurcate duct into two equal parts; hence siamesed,
adj.
SIAP 1 Systems integration and assurance phase, of
procurement process (UK).
2 Standard instrument approach procedure.
Siap[s] Straight-in approach procedure[s].
SIAR Service de Surveillance Industrielle de
l’Armement (F).
SIAT Service instructor aircrew training.
SIATI Society of Indian Aerospace Technologies and
Industries [office, Bangalore 560 075] (India).
SIB 1 Special Investigation Branch (UK).
2 Service Information Bulletin.
3 Subject indicator box [message sent by signal].
4 System isolation breaker.
sibilant filter One removing hissing frequencies from
speech on R/T.
SIC 1 Steady initial climb, ie V 4 .
2 Standards Information Center (NBS).
3 Service instruction circular.
4 Second in command.
SiC Silicon carbide.
Sicas SSR improvements and collision-avoidance
system [P adds panel].
SICBM Small ICBM.
sick Faulty.
SICM Small intercontinental missile.
SID 1 Standard instrument departure.
2 System integration demonstration.
3 Spray-impingement drag (marine aircraft).
4 Supplemental inspection document.
5 Switch-in deflector.
6 Situation information display.
7 Sensor-image display.
SIDA Security indentification display area.
SIDC Space Innovation and Development Center
[Schriever AFB, Colorado] (USAF).
side number
Sidcot One-piece flying suit with numerous pockets and
zips and high fur collar, widely used from 1919 including
by RAF (from designer Sidney Cotton).
SIDE Suprathermal ion detector experiment.
side-arm controller Primary flight-control input in
form of miniature control column at side of cockpit (of
combat aircraft) on console incorporating armrest to
facilitate accurate flight under conditions of large applied
acceleration.
sideband Band of frequencies produced above and
below carrier frequency by modulation; sum and difference
products are called upper * and lower *.
side-by-side 1 Two-seat aircraft in which seats are in
same transverse plane at same level.
2 Piston engine in which connecting rods are both same,
with big ends side-by-side on crankpin (thus, cylinders of
opposed banks are not quite in line); constructional form
of most modern light aircraft engines.
side car, sidecar 1 Airship car suspended away from
centreline plane.
2 A parallel emitter, notably an LWIR boresighted
alongside a laser.
side direction Normal to plane of symmetry.
side elevation Portrayed as seen from side, in case of
drawing as seen from infinite distance, ie orthographically.
side fence[s] Fences above wing and/or flap of USB
aircraft to restrain lateral spread of main engine jet.
side float Usually means sponson.
side force Force acting normal to plane of symmetry.
side-force control Aircraft flight-control system capable
of exerting lateral [transverse] force, normally by vertical
surfaces in front of as well as behind c.g. Aircraft with **
can almost instantly change track by flying diagonally,
without need to roll or change fuselage axis; make immediate
lateral corrections to line of fire of fixed gun; move
laterally out of hostile gunfire without prior roll.
side-force surface One designed to generate transverse
force acting almost through c.g., as on NASA TIFS
C-131.
side frequencies Carrier plus or minus audio frequency.
sideline noise Measured beside takeoff run at distance
from centreline of 450 m (ICAO Annex 16) or 0.35 nm
(FAR 36 CAN 5, 4-engined aircraft) or 0.25 nm (2-,
3-engined). See noise.
sidelobe Lobes of aerial radiation propagated at angle to
main lobe, normally unwanted and cause of clutter or
false returns, eg obscuring actual location of sender.
sidelobe clutter Echoes caused by intersection of radar
sidelobes with the ground.
sidelobe suppression Various techniques for eliminating
not presence of sidelobes but their effects.
side-looking Scanning to either side of aircraft track;
hence SLAR, radar whose output is detailed picture of
terrain near track, either all on one side or equally on both
sides, depending on aerial arrangement.
side marker board Display beside airport gate arranged
for nose-in parking giving indicator marks, usually
vertical white bars on black board; when aligned with
captain’s left shoulder, airbridge is aligned with passenger
door.
Sident Site identification.
side number Bold three-digit Modex number (US Navy).
614