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Glossary — U

UAE United Arab Emirates

UAV Unmanned (or uninhabited) aerial vehicle; contrast RPV.

UHCA Ultra-high capacity airliner.

UHF Ultra-high frequency.

UHT UnterstutuzungHubschrauber Tiger the final anti-tank/fire support configuration of German Army Tigers, replacing original PAH-2.

UK United Kingdom.

ultralight Light aircraft with parameters below specified national limits, qualifying for less rigorous licensing; also known as microlight. See table.

Country
Name
Seat/s
Empty
Weight
MTOW
Fuel
Vso
Australia
Ultralight
1-2
  
540 kg
  
  
France
ULM 1
1
  
300 kg 2
  
35 kt 3
  
ULM 1
2
  
450 kg 2
  
35 kt 3
Germany
Ultralicht
1-2
  
472.5 kg
  
  
UK
Microlight
1-2
  
450 kg
  
35 kt
USA
Ultralight
1
254 lb
  
5 USg
  
  
LSA
1-2
1,232 lb
  
    
  

1 Ultra leger motorise; criteria accepted by several European countries.

2 Plus 10 per cent for seaplanes and amphibians.

3 Plus 5 percent for seaplanes and amphibians.

UN United Nations.

upper surface blowing Turbofan jet expelled over upper surface of wing to increase lift.

usable fuel Total mass of fuel consumable in flight, usually 95 to 98 per cent of system capacity.

USAF United States Air Force.

USCG United States Coast Guard.

useful load Usable fuel and other consumables plus payload.

US gallon 0.83267 Imperial gallon; 3.785 litres.

USMC United States Marine Corps.

USN United States Navy.

USNR United States Naval Reserve.

USSR Union of Soviet Socialist Republics (see CIS).

UTTAS Utility Tactical Transport Aircraft System.

UV Ultra-violet.