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Aviation Terms - U


UDF-

(See DIRECTION FINDER.)

UHF-

(See ULTRAHIGH FREQUENCY.)

ULTRAHIGH FREQUENCY- The frequency band between 300 and 3,000 mHz. The bank of radio frequencies used for military air/ground voice communications. In some instances this may go as low as 225 mHz and still be referred to as UHF.

ULTRALIGHT VEHICLE- An aeronautical vehicle operated for sport or recreational purposes which does not require FAA registration, an airworthiness certificate, nor pilot certification. They are primarily single occupant vehicles, although some two-place vehicles are authorized for training purposes. Operation of an ultralight vehicle in certain airspace requires authorization from ATC.

UNABLE- Indicates inability to comply with a specific instruction, request, or clearance.




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Last update June 6, 2005
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