Aerospace Acronyms: U

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Acronym	Definition
UAS	University Air Squadron.
UDF	UHF Direction Finding.
UFN	Until Further Notice.
UHF	Ultra-High Frequency. Radio frequencies in the 300-3,000 MHz band.
Unicom	Privately-operated advisory A/G radio service at uncontrolled airfields (USA).
UNL	Unlimited
U/S	Unserviceable (i.e not working) when applied to an aircraft or its equipment.
UTC	Co-ordinated Universal Time, formerly Greenwich Mean Time.

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