Aviation Dictionary

On this page you will find a searchable and comprehensive alphabetical list of aviation terms. You can help us make it the most comprehensive list in the world. If we have missed anything, click on the ‘send us your word’ button to send us your word, acronym or definition and we will consider adding it to our dictionary.

Aviation Dictionary: U

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UAS Undesired aircraft states
UHF Ultra high frequency
Uncontrolled Airspace This is Class G airspace where ATC does not have control over the movements of any aircraft. There are no clearances required and no control towers.
USB Upper side band
UTC Universal time coordinate

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