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| BAI |
Battlefield air interdiction |
| ballistic parachute |
Emergency recovery parachute, usually for light
aircraft or microlights |
| BAPC |
British Aircraft Preservation Council |
| bar |
Unit of pressure (non-SI); ISA pressure at sea
level is 1.0132 bar |
| battle damage |
In flight damage directly caused by enemy action |
| BDA |
Bomb damage assessment |
| BCAR |
British Civil Airworthiness
Requirements |
| BDLI |
Bundesverband der Deutschen Luftfahrt-,
Raumfahrt- und Ausrüstungsindustrie; German Aerospace Industries
Association |
| BDR |
Battle damage repair |
| Beta mode |
Operating regime of propeller or rotor where
pilot has direct pitch control of blades |
| BG |
Bomb Group (USAF) |
| BHP |
Brake horsepower |
| bingo (fuel) |
Radio call indicating aircraft has critical
(low) fuel state |
| BIT |
Built-in test |
| BITE |
Built-in test equipment |
| bladder tank |
Flexible fuel tank, not part of airframe |
| blade damper |
Device which restrains motion of a helicopter
blade about drag hinge, reduces noise and vibration |
| BLC |
Boundary layer control; control of layer of air
in contact with aircraft surface (usually upper wing surface) to
increase lift, reduce drag or improve controllability |
| bleed air |
Compressed air taken from jet engines to perform
useful function |
| Blimp |
Non-rigid airship |
| blind flying |
Flying without outside visual reference, only
using instrumentation |
| blisk |
Complete compressor stage on a jet engine,
manufactured as a single part |
| block time |
Period of time between when aircraft starts to
move off the apron (with the intention to take-off) to the time it comes
to rest again |
| blown flap |
Flap across which bleed air is blown at high
speed to prevent airflow breakaway |
| BLU |
Bomb live unit |
| BMEWS |
Ballistic missile early warning system (US) |
| BPR |
Bypass ratio |
| BRS |
Ballistic Rescue System; parachute
designed to save aircraft in emergency |
| BRW |
Brake release weight; maximum allowable weight
at start of take-off run |
| BS |
Bomb squadron (USAF) |
| buddy-buddy pack |
In-flight refueling equipment carried on
aircraft weapons pylon in a streamlined container |
| bulk cargo |
Loose freight which is not palletised or
containerised |
| bus or
busbar |
Main electrical system to which generator or
battery power is supplied |
| BVR |
Beyond visual range |
| BW |
Bomb wing (USAF) |
| BWB |
Blended wing/body |
| bypass ratio |
On a turbofan engine: the air that goes around
the engine core divided by the air that goes through the engine core |