Federal Aviation Administration Abbreviations and Acronyms
- UPCUser Position Computation
- UPMUser Position Monitor
- UPMUT1 and Polar Motion
- UPSUninterruptible Power Supply
- URAUser Range Accuracy
- UREUser Range Error
- URSIInternational Radio Science Union
- USUnited States
- US FARFederal Aviation Regulations
- US/U.S.United States
- USAUnited States
- USAFUnited States Air Force
- USCUnited States Code
- USCGUnited States Coast Guard
- USGSUnited States Geological Survey
- UTCUniversal Time Coordinated
- UTPUnshielded Twisted Pair
- UUTUnit Under Test
- UWUnique Word
- UXUninterruptible Power Supply
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