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Glossary >> U |
UDF -- UVDF
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.
(See FAR Part 103.)
UNABLE- Indicates inability to comply with a specific
instruction, request, or clearance.
UNDER THE HOOD- Indicates that the pilot is using
a hood to restrict visibility outside the cockpit
while simulating instrument flight. An appropriately
rated pilot is required in the other control seat
while this operation is being conducted.
(Refer to FAR Part 91.)
UNICOM- A nongovernment communication facility which
may provide airport information at certain airports.
Locations and frequencies of UNICOM's are shown
on aeronautical charts and publications.
(See AIRPORT/FACILITY DIRECTORY.)
(Refer to AIM.)
UNPUBLISHED ROUTE- A route for which no minimum
altitude is published or charted for pilot use.
It may include a direct route between NAVAID's,
a radial, a radar vector, or a final approach course
beyond the segments of an instrument approach procedure.
(See PUBLISHED ROUTE.)
(See ROUTE.)
UPWIND LEG-
(See TRAFFIC PATTERN.)
URGENCY- A condition of being concerned about safety
and of requiring timely but not immediate assistance;
a potential distress condition.
(See ICAO term URGENCY.)
URGENCY [ICAO]- A condition concerning the safety
of an aircraft or other vehicle, or of person on
board or in sight, but which does not require immediate
assistance.
USAFIB-
(See ARMY AVIATION FLIGHT INFORMATION BULLETIN.)
UVDF-
(See DIRECTION FINDER.)
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Pilot Glossary >> U
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