Glossary of Terms
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A non-power-driven lighter-than-air aircraft.
Bare Earth. Surface of the Earth including bodies of water and permanent ice and snow, and excluding vegetation and
Barrette. Three or more aeronautical ground lights closely spaced in a transverse line so that from a distance they appear as a
“base turn” means a turn executed by the aircraft during the initial approach between the
Becquerel (Bq). The activity of a radionuclide having one spontaneous nuclear transition per second.
Bit error rate (BER). The number of bit errors in a sample divided by the total number of bits in the sample, generally
‘Beta Control’ means a system whereby the propeller can be operated at blade angles directly selected by the air crew, or by other means, and normally used during the approach and ground handling.
Blind transmission. A transmission from one station to
‘Boost Pressure’ (piston engines) means the manifold pressure measured relative to standard sea level atmospheric pressure.