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skin paint
axis can vary from horizontal to vertical. Often NC
machine and able to sculpt complete wing skin.
skin paint 1 Radar indication caused by reflected radar
signal from object (DoD); ie blip.
2 Fix obtained by ground radar on aerial target.
skin temperature Temperature of outer surface of body,
esp. in sustained supersonic flight.
skin tracking Tracking of object by means of a skin paint
(1) (DoD). Specifically, without assistance of a
transponder.
skip See skip re-entry.
skip altitude Lowest point of a trough.
ski pad Large-area pad attached to helicopter landing
gear for operations from snow, tundra, muskeg, swamp
and sand.
skip bombing Method of aerial bombing in which bomb
is released from such a low altitude that it slides or glances
along surface of water or ground and strikes target at or
above water or ground level (DoD).
skip distance Distance from transmitter at which first
reflected sky wave can be received, increasing with
frequency.
skip/glide See boost/glide.
skip it Air intercept code: “Do not attack, cease interception”.
skipping Sine-wave flight.
skip re-entry Atmospheric entry by lifting-body spacecraft
in which energy is lost in penetrating atmosphere in
curving trajectory reminiscent of stone skipping on pond,
possible only with very accurate trajectory control if first
skip is not to result in permanent departure from Earth
(see lifting re-entry).
skirt 1 Lowest part of body of large ballistic vehicle
surrounding rocket engine(s).
2 Lowest part of parachute canopy.
3 Lowest part of envelope of hot-air balloon.
4 Flexible structure surrounding and containing
cushion of amphibious and many other types of ACV
enabling vehicle to run over waves or rough ground.
skirt fog Steam cloud during launch from wet pad.
ski-toe locus Imaginary object shaped like front of ski
which TFR runs along terrain by electronic means; size
and form are often variable to give soft to hard ride.
SKPP Separation kernel protection profile [most
demanding for Common Criteria] (NSA).
SKRVT State Commission for Development and Coordination
of Science and Technology (Czech Republic).
SKSV National certification authority (Jugoslavia).
SKT Specialty knowledge tests (USAF).
sky compass Instrument for determining azimuth of Sun
from polarization of sunlight.
sky conditions Amount of cloud in oktas.
sky diver Sport parachutist.
Skydrol Synthetic non-flammable phosphate esterbased
hydraulic fluids (Monsanto).
Sky Guards Trained professionals flying as passengers
to protect against any airborne threat [first introduced by
ANA, Japan].
Skyhook Plastic balloon for meteorological observation
and rocket launch (see rockoon).
skyhopper Simplest aircraft: balloon [invariably hot-air]
under which aeronaut is suspended by harness.
skyjack Aerial hijack (colloq.).
skyline Verb, to get low enemy aircraft visibly above
slag refining
horizon with sky background, or to expose own aircraft
in same way.
Skymarshal Armed Federal security officer riding on
US commercial flights to deter hijacking 1970-73, and
reintroduced 2001 (US Customs Service).
Sky Miles Free travel assigned by airline to frequent
flyer, or offered as competition prize.
skyquake Sonic boom from large hypersonic aircraft.
sky screen Simple optical (camera obscura) device
showing range safety officer if vehicle departs from safe
trajectory; often one for track and another for vertical
profile.
sky shouting Use of aircraft-borne loudspeaker; in most
countries prohibited for private use.
sky wave That portion of a radiated wave that travels in
space and is returned to Earth by refraction in ionosphere
(ASCC). Several other authorities use word ‘reflection’.
Also called ionospheric or indirect.
sky-wave correction Factor to be applied to some hyperbolic
navaids, eg Loran, if sky waves are used instead of
ground waves; varies with relative distances to master and
slave(s).
sky writing Writing, if possible against blue-sky background,
using oil added to exhaust or other system and
forming characters by accurately flying along their
outlines, or using tight formation to switch smoke under
computer/radio control while flying straight along words.
SL 1 Sea level, also S/L.
2 Space-limited, or launcher.
3 Service letter.
4 Schätzstellen für Luftfahrtzeuge (G, Austria).
5 Short landing.
6 Sensitivity level.
7 Start line.
8 Standing lenticular.
9 Sound level.
10 Stereolithography.
S/L 1 Shoot/lock.
2 Sub-level.
3 Sea level.
S l Wing area outboard of fueselage, i.e. net area.
SLA 1 Small light aeroplane.
2 Self-launching aircraft.
3 Service-level agreement.
4 Spacecraft/Lunar-module adaptor.
5 Stage-length adjusted [CASM].
6 Super lightweight ablator.
Slab Sealed lead-acid battery.
slab-sided Having essentially flat (usually near-vertical)
sides.
slab tailplane Horizontal tail formed as single pivoted
surface and used as primary flight control; no fixed
tailplane or hinged elevators (US: horizontal stabilizer).
Called taileron when installed in left/right halves capable
of being driven in opposite directions.
slab trailing edge Blunt railing edge, esp. squared off
normal to line of flight.
SLAE Now SLAET.
SLAEA The Society of Licensed Aircraft Engineers
Australia.
SLAET The Society of Licensed Aircraft Engineers &
Technologists [forned 1943, reconstituted 1962, office
Kingston-upon-Thames] (UK).
slag refining See electro-slag refining.
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