Civil aviation dictionary
Aviation glossary
Terms, abbreviations and procedures explained without unnecessary jargon, with English names and clear definitions.
- Total entries
- 2480
- Terms
- 435
- Abbreviations
- 2045
T
U
- AbbreviationU.S. Air Force
USAF stands for U.S. Air Force in FAA terminology.
- AbbreviationU.S. Army Aviation Flight Information
USAFIB stands for U.S. Army Aviation Flight Information in FAA terminology.
- AbbreviationU.S. Army Corps of Engineers
COE stands for U.S. Army Corps of Engineers in FAA terminology.
- Abbreviationultra high frequency direction finding station
UDF stands for ultra high frequency direction finding station in FAA terminology.
- Radio communications and ATCULTRAHIGH FREQUENCY (UHF)
The frequency band between 300 and 3,000 MHz.
- Abbreviationunable higher altitude
UHA stands for unable higher altitude in FAA terminology.
- Abbreviationunable higher due opposite direction traffic
UHDODT stands for unable higher due opposite direction traffic in FAA terminology.
- Abbreviationunable higher due same direction traffic
UHDSDT stands for unable higher due same direction traffic in FAA terminology.
- Abbreviationunable higher due traffic
UHDT stands for unable higher due traffic in FAA terminology.
- Abbreviationunable lower due traffic
ULDT stands for unable lower due traffic in FAA terminology.
- Abbreviationunable to approve altitude requested
UNAR stands for unable to approve altitude requested in FAA terminology.
- Abbreviationunable to contact company radio
UNCC stands for unable to contact company radio in FAA terminology.
- Abbreviationunable to finish
INSUF stands for unable to finish in FAA terminology.
- Abbreviationunable to monitor
UNMON stands for unable to monitor in FAA terminology.
- Abbreviationunable to transmit
NIL stands for unable to transmit in FAA terminology.
- Abbreviationuncertainty phase code (alerting service)
INCERFA stands for uncertainty phase code (alerting service) in FAA terminology.
- OperationsUNDER THE HOOD
Indicates that the pilot is using a hood to restrict visibility outside the cockpit while simulating instrument flight.
- OperationsUNFROZEN
The Scheduled Time of Arrival (STA) tags, which are still being rescheduled by the time-based flow management (TBFM) calculations.
- OperationsUNICOM
A nongovernment communication facility which may provide airport information at certain airports.
- AbbreviationUnited States Notices to Airmen System
USNS stands for United States Notices to Airmen System in FAA terminology.
- AbbreviationUniversal Safety Oversight Audit Program
USOAP stands for Universal Safety Oversight Audit Program in FAA terminology.