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SMV
SMV Space maneuver vehicle (US).
SMW Strategic Missile Wing (USAF).
SMWHT Somewhat.
SMWP Standby master warning panel.
SN 1 Snow (ICAO).
2 Since new (often S/N).
3 Shipping notice.
4 Scout trainer (USN aircraft category 1939-48).
5 Secretary of the Navy (US).
6 Strategic navigation.
7 Subnetwork.
S/N 1 Stress against number of alternating load cycles
to failure; S is normally ratio of alternating load to ultimate
strength, so that for S = 1 N = 1, while for S = 0.8 N
may be 10 4 .
2 Serial number.
3 Signal/noise ratio.
Sn Tin.
sn Sthène.
SNA 1 Sindicato Nacional dos Aeronautas [civil pilot
trade union; office, Rio de Janeiro 20020] (Brazil).
2 System network analysis, or architecture.
3 National aero club (Slovakia).
SNABV Syndicat National des Agences et Bureaux de
Voyages (F).
SNAC Subnetwork access; P adds protocol.
SNAEC, Snaec Special notice to aircraft and engine
contractors (UK, MoD).
snag 1 Fault condition or impediment to progress (UK,
colloq.), hence * list.
2 Dogtooth or other abrupt discontinuity in leading
edge.
Snagfa Syndicat National des Agents et Groupeurs de
Fret [freight] Aérien (F).
snake drill Hand drill with tool bit driven by flexible
connection.
snake mode Control mode in which pursuing aircraft
flies preprogrammed weaving path to allow time to
accomplish identification functions (DoD).
snaketrack Weaving flight path, under pilot control or
preprogrammed, in case of aerial target to provide greater
challenge to defences.
snaking Natural oscillation in yaw at approximately
constant amplitude.
SNAP, Snap 1 Systems for, or supplementary, nuclear
auxiliary power; former major programme for space electric
power generation using RTG and similar methods.
2 Synchronous numeric array processor, an add-on to
enable small computers to act as simulators.
3 Steerable null antenna processor.
Snapac Sindacarto Nazionale Autonomo Personale
Aviazione Civile (I).
snap-action 1 Positive full-range movement of bistable
device, esp. mechanical, eg spring-loaded two-pole switch
or valve.
2 Various meanings in electronics, esp. abrupt jump in
output of magnetic amplifier with large positive feedback.
snap-down Ability to see, engage and destroy target at
much lower level, esp. one very close to surface; hence *
missile. Crucial factor is ability of radar or other sensor to
see target against ground clutter.
snap gauge C-frame go/no-go gauge for shaft measures,
usually with one anvil adjustable.
SNII
snap in Of combat aircrew, to enter and connect up to
aircraft prior to mission.
snap report Preliminary report by aircrew of observations,
prior to compilation of mission report (ASCC etc).
Term not to be used (DoD).
snap ring Sprung fastener which locks into peripheral
groove on either inside or outside diameter.
snap roll See flick roll.
snap-shoot Traditionally, quickly aimed shot; in modern
air combat, shooting with fixed gun without need for prior
tracking using correctly interpreted HUD sight
symbology, usually providing a tracer line.
snapshot ‘Photograph’ of all input parameters recorded
at particular points in time by HUM to log steady-state
conditions for future long-term analysis.
snap start Prelaunch AAM condition in which weapon
is pre-tuned to guidance radar and then returned to
passive mode but ready for instant launch.
snap-up Rapid maximum-performance pull-up to
engage target at higher altitude. US aerodynamicists have
called the Cobra manoeuvre a snapup [one word].
snap-up missile AAM capable of engaging and
destroying target aircraft at much greater height than
launch platform.
snatch Pick up of a [large military] glider by a tug flying
low overhead. Also called * launch.
snatch load Suddenly applied load, very quickly
reaching maximum value, as applied to shroud lines by a
rapidly opened parachute.
SNavO Senior, or station, navigation officer (RAF).
SNAW School of Naval Air Warfare (St. Merryn, UK).
SNC 1 Standard navigation computer; small legstrapped
box giving continuous moving-map readout
showing aircraft position.
2 Strategic Nuclear Command (India).
SNCO Senior NCO.
SNCR Subnetwork connection reference.
SNCTA Syndicat National des Contrôleurs du Trafic
Aérien [office, F-13601 Aix-en-Provence] (F).
SNCTAA Syndicat National des Cadres et Techniciens
de l’Aéronautique et de l’Astronautique (F).
SND Secondary navigaton display.
SNDC Subnetwork dependent convergence; F adds
function, P protocol.
SNDV Strategic nuclear delivery vehicle[s].
SNEA Sindicato Nacional das Empresas Aeroviarias
(Brazilian Air Transport Association).
Snell law Law of index of refraction, n, sin θ = n 2 sin θ 2
where n are refractive indices of two media.
Sneta, SNETA Sindicato Nacional das Empresas de
Táxi Aéreo [office, Rio de Janeiro, over 80 members]
(Brazil).
SNF Short-range nuclear force(s).
SNFLK Snowflakes.
SNG Synthetic (or synthesized, or substitute) natural
gas.
SNI 1 Signal/noise index (Omega).
2 SNA network interconnection.
3 Stand number indicator.
SNICF Subnetwork independent convergence function.
snifter(s) Small spin motors (often one motor with
tangential nozzles) for small (eg anti-tank) missiles.
SNII Aeroplane scientific test institute of GVF
(USSR, R).
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