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B
B 1 Pitching moment of inertia.
2 Blue (ICAO).
3 Base (of semiconductor device).
4 Aircraft category, bomber (USAS, USAAC,
USAAF, USAF 1924→, USN 1941–43 and 1962→; UK
role prefix).
5 Total aircraft noise rating (Belgium, Netherlands).
6 Boron.
7 Magnetic flux density, or induction.
8 Prefix for nuclear bombs (US).
9 Degrees Baumé.
10 Beginning [precipitation].
11 Hourly cost.
12 Airspace near airport up to 1,000 ft AGL (FAA).
13 Beacon.
14 Rotorcraft category: cannot maintain flight after
failure of one engine.
15 Receiver bandwidth.
16 Sport-parachuting vertificate: 25 jumps, 10 landing
50m of target.
17 Byte[s].
18 Susceptance.
19 Luminance [B for brightness].
20 Bar, or bi-directional [airfield lighting].
21 Helicopter-rotor tip-loss factor.
22 Aircraft category, airship (FAI),
23 Often used for leftward side force [Z-axis component].
b
1 Wing span.
2 Bars (unit allowed within SI).
3 Barns (unit allowed within SI).
4 Engine bleed mass flow.
5 Number of blades in helicopter main motor.
6 Bit[s].
7 Propeller axial slipstream factor.
8 Pitch of stringers or other panel stiffeners.
B – Induced-drag factor.
B 1 , B 2 1 Graduation ratings from CFS.
2 Used together with b 2 as coefficients defining density
of turbulence in gust calculations.
b 1 Control-surface hinge moment.
b 2 Rate of change of surface hinge moment dCH/d.
B2B Business to business.
B2C Business to consumer.
B 2 H 6 Diborane rocket propellant, usually combined
with OF 2 .
B4 Aviation petrol (G, WW2).
B-category Aircraft used as non-flying trainer.
B-class 1 Military and civil prototype or experimental
aircraft, not certificated but flown by manufacturer under
special rules and with SBAC numerical registration (UK).
2 Terminal or control area near large airport (ICAO
1990, and US 1993).
B-code In flight plan, have DME and transponder with
64-code without encoding altitude.
B-display CRT or other display in which horizontal axis
is bearing and vertical axis is range.
B-licence Commercial pilot’s licence (not ALTP).
B-line 90° to the runway.
B-power supply Plate circuit that generates electron
current in CRT or other electron tube.
B-rating Twin-engine pilot rating.
B-slope B-display.
B-station In Loran, transmitter in each pair whose
signals are emitted more than half a repetition period after
next succeeding signal and less than half an r.p. before
next preceding signal of other (A station).
B-Stoff Hydrazine hydrate (G).
B-vehicles Non-flying vehicles in RAF service.
BA 1 Braking action (ICAO).
2 Budget authority.
3 Base Aérienne (air base, F).
4 Breathing apparatus.
5 Formerly the British Association for the
Advancement of Science [office, London SW7 5HE] UK.
B-A gauge Bayard-Alpert ionisation gauge.
b.a. Buffer amplifier.
BAA 1 The British Airports Authority (1964–86) is
today known as BAA plc, not written in full [130 Wilton
Road, London SW1V 1LQ] (UK).
2 Broad-area announcement.
3 Broad Agency Announcement (Darpa).
4 Bombardiers’ Alumni Association (US).
5 See BAeA.
BAAC 1 British Association of Aviation Consultants
(office, London SW1V 1EJ] (UK).
2 British Aviation Archaeological Council, concerned
with aircraft relics and documents, not with studying
archaeological sites from the air; [office Oulton Broad,
Suffolk NR32 3NH] (UK).
BAAEMS British Association of Airport Equipment
Manufacturers and Services [office, High Wycombe,
Bucks].
BAAHS Bay Area Airline Historical Society (San
Francisco region).
BAAI Balloon and Airship Association of Ireland.
BAAS Broad-area aerial surveillance.
Babbitt (incorrectly, babbit) Family of soft tin-based
alloys used to make liners for plain bearings.
babble Incoherent cross-talk in voice communications
system.
Babinet point One of three points of zero polarisation of
diffuse sky radiation.
BABOV Bureau Aanleg Beheer en Onderhoud van
Vliegvelden (airfield plans and maint.) (Neth.).
Babs, BABS Beam-approach beacon system.
Outmoded secondary radar system which provided fixedwing
aircraft with lateral guidance and distance
information during landing approach.
BAC 1 Blood alcohol content.
2 Bureau of Air Commerce [1926–38, became CAA]
(US).
3 Beryllium aliminium composite.
BACA 1 Baltic Air Charter Association [successor to
Air Brokers Assoc., office London EC3A 8BH] (UK).
2 British Air Charter Association [1946, became
BIATA 1951] (UK).
BACE Basic automatic checkout equipment (USN).
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