Glossary of Acronyms and Abbreviations

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U
Abbrevation
Description
 UAC  Upper Area Control Centre
 UAS  Upper Airspace
 UFN  Until Further Notice
 UHF  Ultra High Frequency (300 to 3000 MHz)
 UIR  Upper Flight Information Region
 UK NATS  National Air Traffic Services (UK)
 UPS  Uninterruptible Power Supply
 URD  User's Requirements Document
 UTC  Coordinated Universal Time
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