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SBU
SBU Sensitive but unclassified.
SBUV Solar backscatter UV.
SBW 1 Steer [nosewheel] by wire.
2 Search bubble window, giving view vertically downwards.
SBX Sea-based X-band radar, crucial element in BMD
system testbed.
SBY, sby Standby.
SC 1 Single-crystal.
2 Speed-control (system).
3 Short circuit (also s.c.).
4 Subgrade code (ICAO).
5 Service ceiling.
6 Stratified [or shaped] charge.
7 Statement of capability.
8 Structured coupling.
9 Single-card.
10 Special committee, or category.
11 Surface combatant, = warship.
12 Supercritical.
Sc 1 Stratocumulus.
2 Schmidt number.
S/C, S/c 1 Spacecraft.
2 Step[ped] climb.
3 Supercharged.
S c Unit compressive stress.
SC-1 One engine inoperative.
SC-2 All engines operating.
SCA 1 Single-crystal alloy.
2 Services de la Circulation Aérienne = ATC (F).
3 Simulation control area.
4 Supercritical compound aerofoil [or airfoil].
5 Short-circuit analysis.
6 Self-contained approach [blind landing aid].
7 Software communications architecture.
8 Strategic-capabilities assessment.
scab External payload carried flush against pylon or
aircraft skin; hence to *-on, scabbed.
SCAD, Scad 1 Subsonic-cruise armed decoy.
2 Often ScAd, Scientific Advisor (NATO).
3 Single-channel amplifier/detector.
4 Stock control and distribution.
Scada Supervisory control and data acquisition.
SCADC Standard control (or, USAF, central) air-data
computer.
Scade, SCADE Safety-critical application development
environment.
Scads 1 Shipboard containerized air-defence system
(BAe).
2 Simultaneous calibration of air-data systems.
SCAF Supply, control and accounts flight (RAF).
scalar Quantity having magnitude only, as distinct from
vector.
scale To reproduce on different scale of size, esp. to
produce gas-turbine engine larger or smaller than original
but broadly similar aerodynamically.
scale altitude effect Compressibility error, so called
because at high speeds ASIR over-reads as if it were at
lower altitude.
scaled Basically unchanged in design but smaller or
larger than original.
scale effect Sum of all effects of change in size of body
in fluid flow, keeping shape same; more specifically, effect
of alteration in Reynolds number.
scanning field
scale factor Output for given input; eg for accelerometer**
is output current in mA per unit of applied
acceleration g.
scale model Model forming exact miniature of original.
scaler Electronic counter producing one output pulse
for given number of inputs; thus binary * has scaling
factor of 2 and decade * has SF of 10.
scale strength Relationship between actual structural
strength of model and its size and same relationship for
full-scale aircraft or other item; hence scale stiffness.
scaling factor Number of input pulses for one scaler
output pulse.
scaling law Mathematical equations permitting effects
of NW explosion of given yield to be determined as function
of distance from GZ provided that corresponding
effect is known for reference explosion, eg 1 kt.
scalloping VOR bearing error due to distortion of
propagation over uneven terrain; also called bends.
Scalp Système de croisière conventionnel autonome à
longue portée (F).
scalping Rough-machining surface layers off ingot.
SCAM, Scam Strike camera.
SCAMA, Scama Switching, conferencing and monitoring
arrangement (NASA).
SCAN, Scan 1 Surface-condition analyser.
2 Simulated comprehensive air navigation.
3 Self-correcting automatic navigator.
scan 1 Motion of electronic beam through space
searching for target (see * types).
2 In EM or acoustics search, one rotation of sensor; this
may determine a timebase (NATO).
3 Air intercept code: “Search sector indicated and
report any contacts”.
4 In TV and other video systems, process of continuously
translating scene into picture elements and thus
varying electrical signal(s).
5 To make one complete cycle or sweep of eyes across
either selected flight instruments or external scene ahead.
SC&D Stock control and distribution.
scandium Sc, silvery metal, density 3.0, MPt 1,541°C,
could become important in aerospace.
scanner 1 Device which scans (usually 1 or 4), including
electron beams in image tubes and CRTs, TV cameras and
many electronic display systems, but esp. including radar
transmitter/receiver aerials (antennas) which are scanned
mechanically or electronically.
2 Radio receiver add-on which trawls the airband.
scanner column Vertical member carrying two or more
superimposed radar aerials, eg in nose of C-5B.
scanning 1 Process by which radar aerial scans, either by
physical rotary movement (usally driven hydraulically) or
by electronic scanning.
2 Process by which electron beam scans, accomplished
by electrostatic or electromagnetic plates or coils.
3 Action of keeping eyes sweeping over external scene
and/or flight instruments and other internals.
4 In particular, searching sky ahead visually, either
front-to-side or side-to-side, to avoid a mid-air.
5 Use of scanner (2).
scanning-beam MLS See MLS.
scanning DME DME that scans stations and locks on to
strongest signal without pilot action.
scanning field Area, usually rectangular, scanned by
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