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scrubbing
scrubbing 1 Lateral sliding of landing-gear tyre on hard
pavement, eg of inner bogie wheels in sharp turn.
2 Significant contact between tips of rotating members,
esp. blades, in gas turbine and casing; also called rubbing.
3 Rapid wear in piston engine caused by detonation.
scrubbing torque limit Maximum permitted torque
imposed on landing-gear leg by scrubbing (1), which
usually determines limit of steering angle of nose gear, and
hence minimum turn radius.
scrub check Last-chance assessment of pupil pilot by
senior instructor (usually CFI).
SCS 1 Stabilization control system.
2 Speed control system.
3 Sea control ship.
4 Survivable control system.
5 Single-crystal sapphire (IR domes).
6 Society for Computer Simulation [office, San Diego,
CA] (US).
7 Signal Corps Set (USA, WW2).
8 Satellite communication system.
9 Single-channel simplex.
10 Slaved compass system.
11 Space Control Squadron.
12 Software configuration set.
SCSC Strategic conventional standoff capability.
SCS-51 Signal Corps Set 51, original form of ILS.
SCSI 1 Small computer system[s] interface.
2 Simulation Computer Society International [AC adds
Advisory Council].
3 Single-card serial interface.
SCT 1 Scattered cloud, also SCTD, CAA = 3 to 4 oktas,
ICAO = 1 8- 4 8 , FAA = 0.1-0.5.
2 Scanning telescope (NASA).
3 Surface-charge transistor.
4 Single-channel transponder.
5 Staff continuation training (CAA).
6 Seat and canopy trainer.
SCTF Standing Contingency Task Force (Canada
2006–).
SCTI Service Centrale des Télécommunications et de
l’Informatique (F).
SCTR Sector.
SCTV/GDHS Spacecraft TV ground data-handling
system.
SC21 21st-century supply chain [numerous members]
(UK).
SCU 1 Signal conditioning unit.
2 Signal convertor unit (satcoms).
3 System[s], switching, stores, sensor, station, supplemental,
or secondary control unit.
4 Satellite communications unit.
SCUC Satellite Communications Users Conference
(Int.).
Scud Subsonic-cruise unarmed decoy.
scud Shredded or fragmentary cloud, typically Fs,
moving with apparent greater speed below solid layer of
higher cloud.
scuff plate Protects airframe against impacts from GSE.
scupper Fuel-tight recess around gravity filler, usually
with its own drain.
scuttle 1 Hatch in top of fuselage (US usage).
2 According to Webster: ‘An airport. Brit.’; unknown
to author.
SCV 1 Sub-clutter visibility.
SDF
2 Standardized cross-validated; R adds residual.
scuzzy Small computer system[s] interface [colloq.].
SCWA Single-channel wire access.
SCWG Satellite communications working group.
SD 1 Shaft delivery, ie rotary output.
2 Shipping document.
3 Structured design (software).
4 Service dress (RAF).
5 Specification detail.
6 System, or situation, display, or device.
7 Storm detection (NWS, ARTCC).
8 Side display.
9 Service deviation, or Standard deviation.
10 Self-destruct, or destroying.
11 Radar weather report (ICAO).
12 Surveillance drone.
13 Sympathetic detonation.
S/D Synchro to digital.
S D 1 Distance between centres of ground-contact areas
of diagonally-opposite wheels of a bogie.
2 Propeller [usually not helicopter rotor] disc area.
Sd Sodium [lighting].
SDA 1 System, or sister, design authority.
2 Strategic-defense architecture.
SdA Société d’Aviation [1863, became SFNA] (F).
SDAC System-data analog converter.
SDACS Solid-fuel divert and attitude-control system.
SD&D System development and demonstration
(USAF).
SDAS 1 Source-data automation system[s].
2 Satellite-data acquisition subsystem.
SDAT 1 Sector design and analysis tool (ATC).
2 Silicon-diode array target.
SDAU Safety Data and Analysis Unit (CAA, UK).
SDB 1 Small-diameter bomb.
2 Small disadvantaged business.
SDBY Standby (ICAO).
SDC 1 Synchro-to-digital converter.
2 Signal data converter, or computer.
3 Space Defense Center (Colorado Springs, USAF).
4 System data capture.
5 Shuttle Data Center.
6 Satellite data communications; S adds system.
7 Shaft-driven compressor.
8 Supersonic-dash capability.
9 Strategic Defense Command (USAF).
10 Situation-display console.
SDD 1 Standard disk drive.
2 System design and development.
3 System development and demonstration [now
SD&D].
4 Synthetic dynamic display.
5 Sensor data degradation.
6 Situation data display; -T adds Tower-Brite.
7 System description document.
SDDM SecDef decision memorandum (US).
SDE 1 Spatial-database engine.
2 Software development environment[s].
3 Scatter detection enhancement.
SDF 1 Single degree of freedom.
2 Simplified directional facility (FAA).
3 Self-destruct fuze.
4 Stepdown fix.
5 Strategic deterrent forces [previously RVSN] (R).
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