Acronyms

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U

Acronym	Meaning	Source
U/S	Unserviceable	AIS
UAB	Until Advised By	AIS
UAP	ADS-B Upper Airspace Project
UAS	Unmanned Aerial System
UAV	Unmanned aerial vehicle	CASR Part 101
UDF	UHF Direction Finding Stations	AIS
UFIT	Uncontrolled Flight Into Terrain
UFN	Until Further Notice	AIS
UHDT	Unable Higher Due Traffic	AIS
UHF	Ultra High Frequency (300 to 3,000 MHZ)	AIS
UIR	Upper Flight Information Region	AIS
UK	United Kingdom
UL	Upper Limits	AIS
UNA	Unable	AIS
UNAP	Unable to Approve	AIS
UNICOM	Universal Communications
UNL	Unlimited	AIS
UNLC	Unlicensed	AIS
UNREL	Unreliable	AIS
UPR	User Preferred Route
UPT	User Preferred Trajectory
US	United States
US FAR	Federal Aviation Regulations (of the USA)
USA	United States of America
UTA	Upper Control Area	AIS
UTC	Coordinated Universal Time	AIS