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BMTC
3 Ballistic-missile sensor.
4 Battle-management shelter (RAF).
BMTC Basic Military Training Center (USAF
Lackland AFB).
BMTOGW Basic mission takeoff gross weight.
BMTS Ballistic-missile target system.
BMUP Block Modification Upgrade Program (USN).
BMV Brake metering valve.
BMVBW Ministry of Transport and Construction [D-
53175 Bonn] (G).
BMVg Bundesministerium der Verteidigung [Ministry
of Defence; D-53003 Bonn] (G).
BMVIT Ministry of Transport, Innovation and
Technology (Austria).
BN 1 Night bomber (F, obs).
2 Boron nitride.
B/N Bombardier/navigator.
Bn Beacon.
B n Receiver noise bandwidth.
BNAE Bureau de Normalisation de l’Aéronautique et
de l’Espace (F, office, Issy-les-Moulineaux).
BNASC Belgian National AIS (1) Centre.
B/NB Bid or no bid.
BNEA British Naval Equipment Association.
BNFAAB See BAH.
BNG Boosted, not guided.
BNH battery Bipolar nickel/hydrogen.
BNK Bureau of new construction (USSR).
BNL Brookhaven National Laboratory.
B NN Null-to-null bandwidth.
BNR Binary.
BNRID Basic net radio interface device.
BNS Boundary notation system.
BNSC British National Space Centre, formed 1985 as
successor to British Space Development Co. [office,
London SW1W 9SS] (UK)
BO Boom operator.
Bo 1 Boundary lights.
2 Boron.
BOA 1 Basic ordering agreement.
2 Bulle Operationnelle Aéroterrestre (F).
boarding Noun, one passenger.
boarding card, boarding pass Document issued at checkin
which admits passenger to aircraft.
boarding status Current stage reached at gate, ending
with ‘closing’.
boardroom bomber Former WW2 or similar warplane
converted for executive use.
boards Speed brakes (colloq.).
boat seaplane Flying boat (US).
boat-tail Rear portion of aerodynamic body, esp. body
of revolution, tapered to reduce drag. Taper angle must
be gentle to avoid breakaway.
BOB Bureau of the Budget (US).
bobbing Rare fluctuation in strength of radar echoes
allegedly due to alternate attenuation and reinforcement
of successive pulse waves.
BOBS, Bobs Beacon-only bombing system.
bobweight Mass inserted into flight-control system,
usually immediately downstream of pilot’s input, to
impart opposing force proportional to aircraft linear or
angular acceleration.
BOC 1 Bottom of climb.
2 Binary offset carrier.
boiler
3 Binary operating code.
BOD 1 Biochemical, or biological, oxygen demand.
2 Beneficial occupancy date.
bod Male of lowly rank (RAF WW2).
Bode plot Gain or decibel magnitude and phase angle
against system frequency [usually expressed in rad/s].
Bodie Severe test of gas-turbine engine: soak to
maximum carcase temperature, slam deceleration to flight
idle, then slam to MTO.
body 1 Any three-dimensional object in fluid flow.
2 In most aircraft, central structure: hull of marine
aircraft or airship, fuselage of aeroplane or helicopter, *
of missile.
3 Any observable astronomical object, esp. within solar
system.
body axes Outlined by G.H. Bryan in 1903, orthogonal
reference axes, fore/aft or longitudinal [called X], transverse
or lateral [Y] and vertical [Z]. Problem: they have
their origin at the c.g., which has no fixed location. See
other axes: principal, stability, wind.
body bag 1 Occupied by pilot of hang glider, instead of
open harness: reduces drag and keeps occupant warm.
2 Container for corpse in transit.
body burden Aggregate radioactive material (not dose
received) in living body.
body English Guiding the flight of an aerodyne, usually
a glider, by shifting the c.g. of one’s body.
body gear, body landing gear Main landing gear
retracting into fuselage.
body lift Lift from fuselage of supersonic aircraft or
missile at AOA other than zero.
body of revolution Body (2) having circular section at
any station and surface shape described by rotating side
elevation about axis of symmetry. Ideal streamlined forms
are generally such.
body plan Full-scale elevations and sections of aircraft
body in lofting.
body sensor Biomedical sensors worn by astronauts or
aircrew to measure parameters such as body temperature,
pulse rate and respiration.
body stall Gross flow breakaway from core engine and
afterbody in installed turbofan.
BOE Black-out exit; predicted time in manned re-entry
at which communications will be resumed.
boe Barrels of oil equivalent; thus boe/d = boe per day.
boffin Research scientist, esp. senior worker on secret
defence project (colloq).
bog To taxi across ground so soft that landing gear sinks
in and halts aircraft (see flotation).
bogey Air contact (5) not yet identified, usually assumed
to be enemy (UK spelling often bogy).
bogie Landing gear having multi-wheel truck on each
leg.
bogie beam Pivoted beam linking front and rear axles of
bogie to each other and to leg.
bog in To become stuck in soft airfield surface.
bogy See bogey.
BOH Break-off height.
BOI 1 Board of Inquiry.
2 Basis of issue.
boiler Gas-turbine used as a core engine in high-ratio
turbofan, as source of hot gas for tip-drive rotor or fanlift
system or any other application calling for central
power source (colloq.).
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