Glossary of Aviation Legal Glossary Terms
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BALT SEL: Barometric altitude select.
Band-Pass Filter: A filter that allows frequencies between
two cutoff frequencies to pass while attenuating frequencies outside
the cutoff frequencies; a band-pass filter can be constructed as the
composition of a low-pass filter and a high-pass filter.
Bank Angle: The angle between the horizontal plans and the
right wing in the lateral plane, positive when the right wing is
Barometric Altitude Select: A basic guidance mode,
providing vertical guidance to an operator selected barometric
Barometric Altitude: Height with respect to fixed earth
reference (above mean sea level).
Barometric Pressure: Height with respect to fixed earth
reference (barometric altitude, feet above mean sea level).
BC: Bus Controller.
Bench Trial: A trial without a jury. The judge rules on
facts and evidence presented to him.
Bessel 1841: A standard model for computing earth data.
Bias: An offset applied to a measurement for error
BIS: Built-in simulation
Black Out Dates: Not available. Dates on which tickets or
certain fares are not available. Blackout dates usually coincide
with holidays and peak travel seasons.
Body Coordinates: Coordinates referenced to the body of
Body: The aircraft, usually referring to a coordinate
Boresight Angle: The angle between the center line of a
sensor and aircraft center line, either by design or by
Boresighting: A basic control to a data source from
controls and displays to boresight a device. Also, known as a
procedure to align the center line of physical devices, usually
update sensors, so that they provide the most accurate results
possible; a basic control to a data source from controls and
displays; commonly required by FLIR, MMR; boresight procedures
commonly result in correction factors to be downloaded from the host
processor to the device; during boresighting, the device is usually
BPF: Band-pass filter.
Bucket Shop: A consolidator; any retail outlet dealing in
Built-in simulation: Function in avionics software that
simulates sensors, aircraft, and pilot, to exercise avionics
software (including navigation, radio navigation, guidance and
flight director). BIS is often used by a development team to check
basic operation following installation of new software or patches.
BIS is seldom used by aircraft flight crews or maintenance crews.
Burden of Proof: The obligation of one party in a suit to
prove all the requirements necessary to show entitlement to
recovery. If the burden is not met, the party with the burden will
lose the issue or the case.
Bus Controller: A term used to define the role of a device
on a MIL-STD-1553 bus as being master.