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SFPA
SFPA Staring focal-plane array; hence SFPAS adds
seeker.
SFPCA Society for the Preservation of Commercial
Aircraft (US).
SFPD Smart flat-panel display.
SFPM Surface feet per minute; linear speed measure for
machining or grinding.
SFPMAC Société Française de Physiologie et de
Médécine Aéronautique et Cosmonautique [office, Paris
75996] (F).
SFQL Structured full-text query language.
SFR Stepped-frequency radar.
SFRJ Solid-fuel ramjet.
SFRM Total hours since factory remanufacture.
S FRR , S frr Distance from brake-release to recognition
and reaction to engine failure.
SFS 1 Side-force surface.
2 Simulator/fallback system.
SFSO Station Flight-Safety Officer (RAF).
SFSS Satellite field service station.
SFT 1 Satellite field terminal.
2 Standard food trolley (loaded, 136 kg, 300 lb).
3 Surface friction tester.
SFTE Society of Flight Test Engineers; [office,
Lancaster CA93539–4047, with a European chapter
based at Boscombe Down, SP4 0JF, UK] (Int.).
SFTS 1 Service flying training school.
2 Spaceflight telecommunications system.
3 Synthetic flight training system.
SF21 Safe Flight 21, three-year [1999-2001] programme
to demonstrate Free Flight, using ADS-B and TIS-B
(FAA).
SFU Suitable for upgrade.
SFUV Self-filtered ultra-violet.
SFW Sensor-fuzed weapon(s).
SFWA Smart fixed-wing aircraft.
SG 1 Specific gravity, or s.g.
2 Spheroidal-graphite (cast iron).
3 Screen grid.
4 Shell gun, = cannon.
5 Sortie generation, or sorties generated.
6 Schlachtgeschwader, close-support attack wing (G,
WW2).
7 Symbol, or signal, generator.
8 Snow grains.
9 Study group.
10 Synchronization gap [Arinc 629].
S g Ground roll in normal takeoff.
s.g. 1 Specific gravity.
2 Shell [– firing] gun.
SGA Silicon gate array.
SGAC Secrétariat Général à l’Aviation Civile [C adds
‘Commerciale’] (F).
SGAD Supersonic global attack demonstrator (US
AFRL).
SGC 1 Symbol-generator computing.
2 Swept gain control.
3 Smoke-generator cartridge.
SGCAS Study Group on Certification of Automatic
Systems.
SGCI SG cast iron.
SGD 1 Synthesized, or smart, graphic display[s].
2 Secretary-General for Defence; I adds Investment.
SGDF Shaft- and gear-driven fan.
shadowgraph
SGDN Secrétariat Général de las Défense Nationale
[Paris, F-75700] (F).
SGDP Selected ground delay program(me); departures
causing overload at congested arrival fix are manually
assigned chosen later departure time.
SGDU Smart graphic display unit.
SGE USAF Support Group Europe (RAF Kemble).
SGEMP System-generated electromagnetic pulse.
SGF Second-generation Flir.
SGFNT Significant.
SGI Silicon graphics image [generator].
SGIT Special-group inclusive tour.
SGL 1 Signal (ICAO).
2 Static ground line.
SGLS Space ground link subsystem (USAF).
SGLV Second-generation launch vehicle.
SGME Self-generated multipath effect.
SGML Standard generalized markup language.
SGN Standing Group NATO.
SGP Smart graphics processor.
SGR Sortie-generation rate.
SG Rep Standing Group Representative.
SGS 1 Surface guidance system.
2 Sub-grid scale.
3 Satellite ground system, or station.
SGSI Stabilized glideslope indicator.
SGT Satellite ground terminal.
SGU Signal-generator unit.
SH 1 Showers (ICAO).
2 Support helicopter.
S/H Sample and hold; maintains present analog velocity
until next sampling.
SHA 1 System hazard analysis.
2 Sidereal hour angle.
3 Swiss Helicopter Association.
4 Sea height anomaly.
shack Verb, to score direct hit (colloq.).
shackle 1 Loosely used in conventional sense to mean
link attaching dropped stores to carrier or rack; not
recommended.
2 To swap places to enable a pair to exploit tactical
situation.
Shade Shared data environment.
Shadow Subsonic hovering armament direction and
observation window (UAV).
shadow 1 Wingman ordered to stick close to leader in all
circumstances.
2 To duplicate all functions of a manufacturing plant to
provide exact second source.
shadow box Compartmented container for kit of parts
(lean manufacturing).
shadow factor Multiplication factor derived from Sun’s
declination, target latitude and time in determining object
heights from reconnaissance picture shadows; also called
tan alt.
shadow factory Manufacturing plant built and owned
by government but managed by selected industrial
company to duplicate production of urgently required
weapon or product.
shadowgraph Technique, or photograph made by it, in
which point-source light is focused parallel through
tunnel working section and on to film; density gradients
are visible as changed tonal values, proportional to
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