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idirectional cable
bidirectional cable Runway emergency arrester cable
which can stop aircraft from either direction.
BIDS, Bids Battlefield [or baggage] information distribution
[or display] system.
BIFA British International Freight Association [office
Feltham TW13 7EP] (UK).
BIFAP Bourse Internationale de Fret Aérien de Paris.
BiFET Bistable field-effect transistor (gate).
BIFF, Biff 1 Battlefield identification friend or foe.
2 British Industrial Fasteners Federation.
bifilar Suspension of mass by two well separated filaments;
mass normally swings in plane of filaments.
BiFOV Binocular field of view.
bi-fuel 1 Bipropellant.
2 More rarely, heat engine which can run on either of
two fuels but not both together.
bifurcated Rod, tube or other object of slender form
which is part-divided into halves; fork-ended.
bifurcation 1 Point at which duct [eg jetpipe] splits into
two, usually left/right.
2 Analysis of steady states, a * occurring when stability
changes from one state to another as an input [eg, controlsurface
angle] is altered.
Big BLU Proposed large [30,000-lb, 13.6-tonne] deeppenetration
bomb (USAF).
big bone Very large indivisible part of airframe structure,
such as a spar or monolithic bulkhead.
Big Chop, the Killed (RAF, colloq.).
Big Ear Battle group exploitation airborne radio.
Big F Commander (Flying) on carrier (RN).
bigraph Two-letter code for airfield name painted on
local buildings, eg gasholders.
Bigs Bilingual ground station (Acars).
Bigsworth Chartboard, transparent overlay, Douglas
protractor, parallel rules, all integrated (obs).
big-ticket item Subject of a high-value contract (US).
Bihrle See CAP (7).
bilateral Agreement between two parties.
bilateration Position determination by use of AF signal
beamed to vehicle, which re-radiates it to original ground
station and to second at surveyed location giving known
delay path. Can be used for control of multiple vehicles
beyond LOS.
Bill, BILL Beacon illuminator, or illuminating, laser
(ABL).
billet Rough raw material metal form, usually square or
rectangular-section bar, made by forging or rolling ingot
or bloom.
bill of material List of raw material and/or parts needed
to make something.
billow Inflation of each half of Rogallo wing.
BIM 1 Ballistic intercept missile.
2 Blade inspection method (helicopters).
3 Blade integrity monitor.
4 British Institute of Management.
bimetallic joint Joint between dissimilar metals.
bimetallic strip Strip made of sandwich of metals,
usually two metals chosen for contrasting coefficients of
thermal expansion. As halves are bonded together any
change in temperature will tend to curve the strip.
Principle of bimetallic switch and temperature gauge.
bi-mono aircraft Monoplane having detachable second
wing for operation as biplane.
bin 1 Electronic three-dimensional block of airspace.
biological decay
All airspace in range of SSR or other surveillance radar is
subdivided into *, size of which is much greater than
expected dimensions of aircraft. Thus presence of an
aircraft cannot load more than one (transiently two)* at a
time.
2 Upright cylindrical receptacle, esp. some early gun
turrets.
BINA British Isles and North Atlantic.
binary actuator Patented technique in which fluid is
controlled by valve driven by spring-loaded armature
with either of two positions within magnetic field.
binary code Binary notation.
binary munition One whose filling is composed of two
components, mixed immediately before release or launch.
binary notation System of counting to base of 2, instead
of common base of 10. Thus 43 (sum of 2 5 , 2 3 , 2 1 and 2 0 )
is written 101011. All binary numbers are expressed in
terms of two digits, 0 and 1. Thus digital computer can
function with bistable elements, distinction between a 0 or
1 being made by switch being on or off, or magnetic core
element being magnetised or not.
binary phase modulation Radar pulse-compression technique
in which the phases of certain echo segments are
reversed.
binary switch Bistable switch.
binaural Listening with both ears.
bind Noun, boring duty; verb, to complain incessantly
(RAF, traditional).
BINDT British Institute of Non-Destructive Testing
(office, Northampton).
bingo 1 As an instruction, radioed command to aircrew
(usually military) to proceed to agreed alternative base.
2 As information, radioed call from aircrew (usually
military) meaning that fuel state is below a certain critical
level (usually that necessary to return to base). Thus calls
“*fuel” or “Below*”. See next entries.
3 In some single-seat aircraft, alarm [usually bell] in
headset at * fuel point.
Bingo 1 External tanks are empty.
Bingo 2 At start of what must be last practice engagement.
Bingo 3 Must break off combat area and recover to base,
but with margins not present at Chicken.
binor Binary optimum ranging. Binary code modified
for range measurement and minimising receiver acquisition
time.
BINOVC, BinOvc Break[s] in overcast.
BIO Biotechnology Industry Organization (US).
bioastronautics Study of effects of space travel on life
forms.
biochemical engineering Technology of biochemistry.
biochemistry Chemistry of life forms.
biodegradable Of waste material, capable of being
broken down and assimilated by soils and other natural
environments.
biodynamics Study of effects of motion, esp. accelerations,
on life forms.
BIOG British Industry Offset Group [DMA, SBAC]
(UK).
biological agent Micro-organism causing damage to
living or inanimate material and disseminated as a
weapon.
biological decay Long-term degradation of material due
to biological agents.
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