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u/s |
Unservicable |
| UAS |
University Air Squadron (UK) |
| also: |
Unmanned aerial system |
| UAV |
Unmanned aerial vehicle |
| UCAV |
Unmanned combat air vehicle |
| UFD |
Up-front display |
| UFN |
Until further notice |
| UHB |
Ultra-high bypass |
| UHF |
Ultra high frequency |
| UL |
Ultralight (aircraft);
re: microlight |
| ULM |
Ultra light motorised;
re: microlight |
| UN |
United Nations |
| UNPROFOR |
United Nations Protection Force |
| unstick |
Speed at which aircraft leaves surface |
| UPT |
Undergraduate pilot training (US) |
| usable fuel |
Total amount of fuel which can be used in flight
(= total capacity of fuel system minus residual fuel in pumps, lines,
tanks sumps etc.) |
| USAF |
United States Air Force |
| USAFE |
US Air Forces in Europe (USAF) |
| USB |
Upper surface blowing; exhaust air blown over
top of wing to increase lift |
| USCG |
United States Coast Guard |
| useful load |
Total sum of payload and usable fuel; MTOW minus
empty weight |
| US gallon |
= 3.785 litres = 0.833 Imperial gallon |
| USMC |
United States Marine Corps |
| USN |
United States Navy |
| UTC |
Co-ordinated universal time;
previously: Greenwich Mean Time, Zulu |
| UV |
Ultraviolet |