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SVF
2 Space Vehicles Directorate (USAF).
3 Singular-value decomposition.
SVF Schweizerische Vereinigung für Flugwissenschaften
(Switzerland).
SVFR Special VFR.
SVGA Superior video-graphics array, 800×600 pixels.
SVI Smoke volatility index.
SVIS Synthetic vision information system[s].
SVLR Schweizerische Vereinigung für Luft-und
Raumrecht (Switzerland).
SVM Support vector machine.
SVMS Space-vehicle motor simulator.
SVN Satellite vehicle number.
SVO Servo.
SVP 1 Static-vent plate.
2 Senior vice-president.
SVR 1 Slant visual range; attempt to give pilot on final
approach idea of when he will acquire approach lighting,
reported as either nominal contact height at which 150 m
(500 ft) segment of one crossbar will become visible, or at
top of shallow fog layer as minimum visible length of
lighting.
2 Shop-visit rate.
3 Severe.
4 Service of external intelligence (R).
SVRL Several.
SVRR Service readiness review.
SVS 1 Synthetic-vision system.
2 Secure voice switch; E adds equipment.
SVSG Silicon vibrating-structure gyro.
SV-stoff Rocket propellant, typically 85% RFNA, 15%
sulfuric acid (G).
SVT Servo throttle.
SVU Satellite voice unit.
SVUOM State institute for protection of materials
(Czech Rep.).
SVVT VTOL (R).
SVWT Schweizerische Vereinigung für Weltraumtechnik
(Switzerland).
SW 1 Single wheel (MLG).
2 Short-wave.
3 Surface wave.
4 Strategic Wing (USAF).
5 Space Wing (USAF).
6 Secretary of War (US).
7 Skin waviness.
8 Single-wedge (aerofoil).
9 Snow shower.
10 Software.
11 Switch [also often S W ].
S/W 1 Software.
2 Surface wind.
S W Common for wing area.
Swaarm Smart weapon, anti-armour.
Swafrap Swedish air force rapid-reaction force.
swageing Joining by cold-squeezing one member around
another, eg electrical or control-cable terminal or endfitting
on to end of cable [US, swaging].
SWALAS Shallow-water ASW localization and attack
system.
swallowed shock Position of shockwave across
airbreathing engine or other inlet inside duct, when mass
flow is ρVA but internal pressure is low (normally equated
with zero thrust). Can be feature of plain pitot inlet or any
sweep
other type. Resumption of correct engine operation
restores shock to normal position at inlet.
swallowing capacity Ability of inlet to handle large
airflow, esp. over wide range of air densities and Mach
numbers.
swan-neck Section of gas-turbine engine joining tandem
axial compressors in which diameter is reduced.
SWAP 1 Severe-weather avoidance plan, or program
(US).
2 System-worthiness analysis program (FAA 1966).
3 Society of World Aircargo Professionals [office,
Darien, CT] (US).
Swaps Standing-wave acoustic parametric source.
SWarF Pronounced swarf, Senior Warfighter Forum [all
combat commands, Pentagon Joint Staff; June 2004–]
(US).
Swarm 1 Stabilized weapon and reconnaissance mount.
2 Small warfighter array of reconfigurable modules. See
next.
swarming Warfighting concept in which dozens to
hundreds of small networked warfighting units stealthily
coalesce to attack a target and then disperse, ready for the
next ‘pulse’.
swashplate Disc rigidly or pivotally mounted on shaft as
drive mechanism for plungers or rams arranged parallel to
shaft; when disc is normal to shaft, plunger stroke is zero,
increasing to maximum at maximum * obliquity. In
hydraulic motor * is driven, not driving, member.
swashplate plane The rotor control plane in a helicopter.
SWAT Special weapons and tactics team (US police
forces).
Swat, SWaT 1 Slotted-waveguide technology.
2 Stovl weight-attack team.
swath, swathe The preferred spelling is the former,
universal in the US. Among aerospace meanings are:
1 Area treated in each pass over field by AG-aircraft,
usually without deliberate overlap.
2 Area covered in one pass over target by SAR, camera
or similar sensor, invariably with overlap.
sway Lateral movement without rotation (simulator).
sway braces, swaybraces 1 See crutches.
2 Additional struts, not normally part of aircraft,
required to brace particular large or winged store.
sway space Clear space left around any shock-mounted
item.
SWC 1 Special Weapons Center (Kirtland AFB, NM;
USAF).
2 Sky wave correction (Loran).
3 Solar wind composition.
4 Space Warfare Center; in March 2006 renamed SIDC.
5 Strategic Warfare Center.
6 Spot-wind chart.
SWCL Short-wavelength chemical laser.
SWD Surface-wave device.
SWE 1 Stress wave emission.
2 Software engineering.
sweat cooling See transpiration cooling.
sweating, sweated joint Joining two tinned members
without additional solder or brazing metal.
sweep 1 Sweepback or sweepforward.
2 Total angular movement of aerial, eg surveillance
radar, oscillating in azimuth (sector scan).
3 Total movement, normally expressed in linear
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