| back course sector |
The course sector that is situated on the opposite side of the localizer (LOC) antenna from the runway |
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| backtrack |
The taxiing of an aircraft on a runway in use in a direction opposite to the landing or takeoff direction |
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| ballistic parachute system |
An aircraft parachute system that extracts/propels the parachute via an ignitable propellant, e.g.: rocket motor or explosive charge. |
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| balloon |
A non-power-driven lighter-than-air aircraft |
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| baro setting |
Altitude reference setting |
Millie |
| barometric vertical navigation |
A navigation system that presents to the pilot computed vertical guidance referenced to a specified vertical path angle (VPA) nominally 3°. The computer-resolved vertical guidance is based on barometric altitude and is specified as a VPA from reference datum height (RDH) |
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| barometric VNAV |
A navigation system that presents to the pilot computed vertical guidance referenced to a specified vertical path angle (VPA) nominally 3°. The computer-resolved vertical guidance is based on barometric altitude and is specified as a VPA from reference datum height (RDH) |
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| barrel roll maneuver |
A vertical rolling maneuver used to reduce aspect angle while keeping sight of the bogey and maintaining nose-tail separation |
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| base |
A flight path extending from the end of the downwind leg to the extended centreline of the approach end of the landing runway |
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| Base Defense Zone (NATO) |
BDZ |
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| base leg |
A flight path extending from the end of the downwind leg to the extended centreline of the approach end of the landing runway |
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| Basic Fighter Maneuvers (What you do to kill the other pilot once you are in a fight. BFM implies a single plane rather than a formation) |
BFM |
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| basic ultralight aeroplane |
An aeroplane having no more than two seats, designed and manufactured to have: (a) a maximum takeoff weight not exceeding 544 kg (1200 lb) |
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| basic ultralight aeroplane |
and (b) a stall speed in the landing configuration (Vso) of 39 kt indicated airspeed, or less, at the maximum takeoff weight |
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| beacon |
An aeronautical light arranged, either through optical design or mechanical motion, to be visible to all azimuths, either continuously or consecutively, to designate a particular point on the surface of the earth |
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| bearing |
The horizontal direction to or from any point, usually measured clockwise from true north, magnetic north or some other reference point, through 360° |
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| bedpost |
A significant point located along the established en route structure over which an aircraft cleared for a standard terminal arrival (STAR) or an RNAV STAR is required to enter the terminal area |
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| bellycheck |
A momentary unloaded bank to check the blind side of a turning aircraft |
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| below minimums |
An expression indicating that the weather conditions are below the minimums prescribed by regulation |
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| BEV accelerator |
billion electron volts accelerator |
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