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B&GS
B&GS Bombing and gunnery school.
bandit Air contact (5) known to be hostile.
band of error Band of position.
band of position Band of terrestrial position, usually
extending equally on each side of position line, within
which, for given level of probability, true position is
considered to lie.
B&P Bid and proposal.
bandpass Width, expressed in Hz, of band bounded by
lower and upper frequencies giving specified fraction
(usually one-half) of maximum output of amplifier.
bandpass filter EM wave filter designed to reduce or
eliminate all radiation falling outside specified band of
frequencies.
B&S Brown and Sharpe.
bandwidth 1 Number of Hz between limits of frequency
band.
2 Number of Hz separating closet lower and upper
frequency limits beyond which power spectrum of timevariant
quantity is everywhere less than specified fraction
of its value at reference frequency between limits.
3 Range of frequencies between which aerial performs
to specified standard.
4 In EDP and information theory, capacity of channel.
5 Band of position, usually expressed in nm on each side
of PL (1) or track.
bang Sound caused by passage of discontinuous
pressure wave in atmosphere (sonic bang).
bang-bang Any dynamic system, especially one exercising
control function, which continually oscillates
between two extreme ‘hard-over’ positions. Also called
flicker control.
bang out To eject (colloq.).
bang valley Land or sea area under track where supersonic
flight is permitted (colloq.).
banjo Structural member having form of banjo, with
open ring joined to linear portion (on either or both sides)
projecting radially in same plane. Typically used to link
spar booms on each side of jet engine or jetpipe aperture.
bank 1 Attitude of aerodyne which, after partial roll, is
flown with wings or rotor not laterally level. Held during
any properly executed turn.
2 To roll aerodyne into banked position.
3 Linear group of cylinders in piston engine.
4 Pool of trained aircrew, esp. pilots, for whom no jobs
are immediately available.
bank and turn indicator Turn and slip indicator.
banner cloud Cloud plume extending downwind of
mountain peak, often present on otherwise cloudless day.
banner 1 Large fabric strip towed behind aircraft,
usually bearing advertising statement readable from both
sides.
2 Fabric sleeve placed over propeller blade, usually
saying FOR SALE.
banner sleeve Tow target in form of long tube inflated by
slipstream, usually called sleeve target.
banner target Air-to-air or ground-to-air firing target in
form of towed strip of flexible fabric like elongated flag.
banter Critical comment on a pilot’s performance by his
peers who are watching.
BAO Battlefield air operations, Afsoc field kit.
BAOR British Army of the Rhine.
BAP 1 Bomber aviation regiment (USSR).
2 Bank-angle projection.
BAPA
3 Be a pilot (US GA initiative).
4 Bombe anti-personnel (F).
BAPA British Aeromedical Practicioners Association.
BAPC 1 British Aircraft Preservation Council [1967–,
office Manchester M3 4FB] (UK).
2 British Association of Parascending Clubs.
Bapta Bearing and power-transfer assemblies (comsat).
BAQ Base allowance for quarters (US armed services).
BAR 1 See * UK.
2 Broad Area Review.
bar 1 Unit of pressure, allowed within SI and standard
in meteorology and many other sciences. Equal to
10 5 Nm –2 = 14.5037 lb/in 2 . In units contrary to SI, 10 6
dynes cm –2 or 750.08 mm; 29.53 in of Hg. One bar
(1,000 mb) is Normal Atmospheric Pressure.
2 Metal [usually gold] bar(s) across ribbon of medal to
show decoration has been awarded twice (thrice); in
written form, each bar appears as a star *.
baralyme Trade name for mixture of barium and
calcium hydroxides used to absorb CO 2 .
Barb Boosted anti-radar bomb (S Africa).
barbecue manoeuvre Deliberate intermittent half-rolls
performed by spacecraft to equalise solar heating on both
sides.
barber chair Chair capable of gross variation in inclination.
barber-pole instrument Indicator using rotating spirals,
such as PVD (2).
barbette Defensive gun position on large aircraft
projecting laterally and providing field of fire to beam.
BARC Bhaba Atomic Research Centre [NW warheads]
(India).
Barcap Barrier combat air patrol between naval strike
force and expected aerial threat.
Barcis British airports rapid control and indication
system.
bar code Geometric patterns, no two alike, printed on
document (eg flight coupon) and read by light pen
connected to computer storing data (eg stolen ticket
numbers).
bare base Airfield comprising runways, taxiways and
supply of potable water.
bare engine Generally means engine without
fuel/oil/water or any auxiliary devices such as APU, cabin
compressor or vectored nozzle(s).
barf bag Sick bag.
Barif Bureau of Airlines Representatives in Finland.
Barig Board of Airlines Representatives in Germany.
barn 1 Unit of area for measuring nuclear crosssections.
Equal to 10 –28 m 2 or 10 –22 mm 2 . Symbol b.
2 Non-hardened hangar for single aircraft, eg SR–71.
barnstormer Formerly, itinerant freelance pilot who
would operate from succession of unprepared temporary
airfields giving displays and joyrides.
baro Barometric.
baro-corrected Pressure altitude corrected to local
atmosphere.
barogram Hard-copy record made by barograph.
barograph Barometer giving continuous hard-copy
record.
barometer Instrument for measuring local atmospheric
pressure.
barometric altimeter Pressure altimeter.
barometric altitude Pressure height.
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