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BF
watch or instrument; esp. rotatable outer ring of pilot’s
magnetic compass.
BF 1 Block fuel.
2 Blind-flying; thus * instrument, * panel.
3 Base Flight (USN)
4 Below freezing.
5 Bomber/fighter category (USN, 1934–37).
6 Blue Force [many suffixes].
BFA 1 Balloon Federation of America.
2 Battlefield Airlifter (RAAF).
BFAANN British Federation Against Aircraft Noise
Nuisance.
BFCU Barometric fuel control unit.
BFDAS Basic flight-data acquisition system.
BFDK Before dark.
BFE 1 Buyer-furnished equipment [MS adds management
system].
2 Basic flight envelope.
BFG British Forces in Germany.
BFL 1 Basic field length.
2 Balanced field length.
BFM Basic fighting/fighter/flight manoeuvring (or
manoeuvres).
BFN Beam-forming network [satcoms].
BFO 1 Beat-frequency oscillation, or oscillator.
2 Battlefield obscuration.
3 Bits falling off.
BFOM Basic flight-operations management.
BFoV, BFOV Binocular field of view.
BFP 1 Blind-flying panel.
2 British Flying Permit (ultralights).
3 Best-fit parabola.
4 Blown fuse-plug (tyre).
BFR 1 Biennial flight review, for renewal of pilot licence
(FAA).
2 Before.
BFRP Boron-fibre reinforced plastics.
BFS 1 Bundesanstalt für Flugsicherung (= ATC, G).
2 Back-up flight system.
BFT 1 Basic fitness test[ing].
2 Blue Force Tracking; I adds Initiatives.
BFTS 1 Basic flying training school.
2 British Flying Training School (US 1941–44); A adds
Association (from 1948, office Coulsdon, Surrey).
3 Bomber/Fighter Training System (USAF).
BFU Accident-investigation office (G).
BG 1 Bomb, or Bombardment, Group (USAAC,
USAAF, USAF).
2 Bomb glider, aircraft category (USAAF 1943–46).
3 See *lighting.
BGA The British Gliding Association [1929–; office,
Leicester LE1 4SE] (UK).
BGAN Broadband global area network.
BGFOO British Guild of Flight Operations Officers.
BGI 1 Basic ground instructor.
2 Bus grant inhibit.
BG lighting Blue/green.
BGM Designation code; multiple launch environment
surface-attack missile, = cruise missile.
BGN Begin, begun.
BGP Border gateway protocol.
BGR Best glide-ratio.
BGS 1 Blasting grit, soft, such as Carboblast.
2 Bombing and Gunnery School.
BIDE
BGW Basic gross weight; not normally defined.
B/H Curves of magnetic flux density plotted against
magnetising force.
BHA 1 Brazilian Helicopter Association.
2 Bird-hit area, dangerous during migrations.
BHAB British Helicopter Advisory Board [office
Fairoaks Airport, GU24 8HX] (UK).
BHGA British Hang Gliding Association, now BHPA.
BHGMF British Hang Glider Manufacturers
Federation.
BHI Bureau Hydrographique International.
BHN Brinell hardness number.
BHO Black-hole ocarina (tactical IR suppressor).
b.h.p., bhp Brake horsepower.
BHPA British Hang gliding and Paragliding
Association [formed by merger 1992, office Leicester LE4
5PJ] (UK).
BHRA British Hydromechanics Research Association.
BHS Baggage-handling system.
BI 1 Burn-in.
2 Basse intensité.
BIA Bomb-impact assessment; M adds modification.
BIAM Beijing Institute of Aeronautical Materials.
BIAS Battlefield-illumination airborne system.
bias Voltage applied between thermionic valve (vacuum
tube) cathode and control grid.
biased fabric Multi-ply fabric with one or more plies so
cut that warp threads lie at angle (in general, near 45°) to
length.
bias error Any error having constant magnitude and
sign.
bias force Output of accelerometer when true acceleration
is zero.
bias ply Tyre [tire] construction with alternate layers of
rubber-coated cord extending under the bead at alternate
angles; tread usually circumferentially ribbed.
bias temperature effect Rate of change of bias force,
usually in g °C –1 .
BIATA British Independent Air Transport Association;
formed 1946 as BACA.
BIBA British Insurance Brokers Association.
Bibby coupling Drive for transmitting shaft rotation
without vibration, using multiple flexural cantilevers
linking adjacent discs.
Bicep Battlefield integrated-concept emulation
program.
Bices, BICES Battlefield information collection and
exploitation systems.
biconvex Presenting convex surface on both sides. Such
wings usually have profile formed from two circular arcs,
not always of same radius, intersecting at sharp leading
and trailing edges. Inefficient in subsonic flight.
BICP Back-up integrated control panel [see BUIC].
bicycle Form of landing gear having two main legs in
tandem on aircraft centreline.
BID 1 Baggage information display.
2 Blast-initiation detector [establishes precise location
of warhead detonation].
bid Formal request to receive fuel from a tanker (RAF).
bidding 1 Phase in procurement process in which rival
manufacturers submit detailed proposals with prices.
2 Competitive procedure within air carrier’s flying staff
for licence endorsement on new type of aircraft.
BIDE Blow-in door ejector (engine nozzle).
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