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It is currently 17 Jun 2019, 9:39

All times are UTC

Aviation abbreviation dictionary
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U/S — Unserviceable
UA — United
UAB — Until advised by
UAV — Unmanned aerial vehicles
UDF — UHF direction finding stations
UFIT — Uncontrolled flight into terrain
UFN — Until further notice
UHDT — Unable higher due traffic
UHF — Ultra high frequency (300 to 3,000 MHz)
UIR — Upper flight information region
UL — Upper limits
UNA — Unable
UNAP — Unable to approve
UNL — Unlimited
UNLC — Unlicensed
UNREL — Unreliable
UTA — Upper control area
UTC — Coordinated universal time

All times are UTC