1Dk4eXg

BSC
BSC 1 Beam-steering computer (EW).
2 Bird-scaring cartridge.
BSCU Brake-system control unit.
BSDH Bus shared-data highway.
BSI 1 British Standards Institution [formed 1901 as
Engineering Standards Committee; office London W4
4AL] (UK).
2 Bus system interface [U adds unit].
BSIN Alternative for BSI (2).
BSL 1 British Standard family of light alloys.
2 Base second level (servicing).
BSM Breakaway support mast.
BSN Backbone subnetwork.
BSP 1 Barra side processor.
2 Board support package.
BSPL Band sound pressure level; sound pressure level
in bands each one-third of an octave wide from 50 to
10,000 Hz.
BSPR Boost/sustainer pressure ratio (rocket).
BSPS Beam-steering phase-shifter (Awacs).
BSS 1 British Standard Specification.
2 British Standard family of steels.
BSSM British Society of Strain Measurement [Surrey
Research Park, GU2 5YG] (UK).
BST 1 British Summer Time.
2 TSB [French language].
bst Boresight.
BS/TA Battlefield surveillance and target attack.
BSTS Boost-phase surveillance and tracking satellite
(or system), for detection of enemy launches, tracking of
BVs and PBVs and kill assessment (SDI).
BSU 1 Beam-steering unit.
2 Bypass switch unit.
3 Baggage-screening unit.
BSV Burner staging valve.
BSW British Standard Whitworth [screwthreads].
BT 1 Burn time (rocket).
2 Basic trainer (USAAF, USAF category 1930–47).
3 Bomber/torpedo (USN category, 1942–45).
4 Bathythermograph.
b t Span of horizontal tail.
BTA 1 Beam transfer Assembly (BC/FC)
2 Bonus tax allowance (US).
BTB Bus tie breaker.
BTC 1 Bus tie connector, or contactor.
2 Before top centre.
3 Belgocontrol Training Centre, Brussels.
4 Business Travel Coalition (US).
BTF Buried-target fuze.
BTH Beyond the horizon (radar).
B 3dB 3-decibel bandwidth.
BTI Battlefield target identification; D adds device, S
system. The USA has used BTID to mean battlefield
target identification.
BTL 1 Between cloud layers.
2 Biomass to liquid.
BTM 1 Bromotrifluoromethane (extinguishant).
2 Burn, then mix.
BTMU Brake-temperature monitor unit
BTN Between [also BTW, BTWN].
BTO Bombing through overcast (WW2).
BTP 1 Bureau Trilatéral de Programmes (Eur).
2 British Transport Police.
BTR 1 Bus tie relay.
buckling
2 Better (ICAO).
BTS 1 Bureau of Transportation Statistics (US).
2 Border and Transportation Security [DoT] (US).
BTsVM On-board [digital] computer (R).
BTT Basic training target [aircraft].
Btu 1 British Thermal Unit (alternatively, BTU,
BThU).
2 Bus, or basic, terminal unit.
BTV 1 Boost [rocket motor] test vehicle.
2 Ballistic test vehicle.
3 Brake to vacate.
BTVOR Weather broadcast terminal VOR.
BTW, BTWN Between.
BTX 1 Telephone information system (G).
2 Benzene, toluene, xylidene.
BU 1 Break-up, thus a guided-weapon * unit.
2 Back-up.
3 Broken up.
BUAA Beijing University of Aeronautics &
Astronautics [subsidiary of AVIC; 100183 Beijing]
(China).
BuAer Bureau of Aeronautics (USN, 1921–59).
BUB Back-up battery/batteries.
bubble 1 Continuous ovate-blister film of fuel from
airspray-type burner at low flow rate.
2 Region of continuous EW protection.
bubble horizon Bubble turn and slip.
bubble memory Computer memory whose bits are
distributed among microscopic voids (bubbles) in a 3-D
volume of solid.
bubble sextant Sextant in which local horizontal is established
by a bubble device. Often called bubble octant,
because arc is usually not greater than 45°, restricting altitude
to 90°.
bubble turn and slip Primitive flight instrument in which
lateral acceleration is indicated by sideways displacement
of bubble in arched glass tube of liquid.
BUCD Back-up command destruct.
buck Dolly or transport frame, with or without wheels
and usually making no provision for inverting (rolling
over) contents, tailored to carry complete engine or other
major equipment item.
bucket 1 In US, a turbine rotor blade.
2 Principal member of most types of thrust reverser,
two buckets normally rotating and translating to block
path of efflux and divert it diagonally forwards.
Alternative (UK) = clamshell.
3 Graphical plot having basic U shape resembling *,
notably produced by adding one plot of negative slope (eg
operating and servicing cost against MTBF) to a related
plot of positive slope (eg capital cost against MTBF).
4 A new [2004] buzzword meaning subdivision or part
(USAF).
bucket brigade Integrated-circuit device, comprising
MOS transistors connected in series, serving as shift
register by transferring analog signal charge from one
storage node to next.
bucket shop Retail outlet (shop) offering non-IATA
passenger tickets at cut prices.
bucking Repeated succession of stalls and recoveries,
deliberate or otherwise.
bucking bar Shaped bar held against shank in manual
riveting.
buckling Lateral deflection of structural member under
113