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USTB
USTB Unstabilized.
USTC United States Transportation Command.
USTDA United States Trade and Development
Agency.
USTO Ultra-short takeoff.
US ton Short ton (see ton).
USTS Uhf satellite-tracking system.
USUA US Ultralight Association.
USV Überschall Verkehrsflugzeug = SST (G).
US/VTOL Ultra-short or VTOL.
USW 1 Undersea warfare.
2 Ultrasonic welding.
USWB US Weather Bureau.
UT 1 Under training (often u/t).
2 Universal time.
3 Ultrasonic.
4 Update time.
U T Helicopter rotor-blade in-plane velocity parallel to
plane of disk.
UTA 1 Unit training assembly.
2 Upper-airspace control area (CAA).
UTC 1 Universal time, co-ordinated [previously GMT,
and see Zulu].
2 University Technology Centre/Center.
UTCS 1 Universal tactical control system (aerial
targets).
2 Universal target control station.
UTD Unit training device.
UTE Unmanned threat emitter.
UTIAS University of Toronto Institute for Aerospace
Studies.
Util Utilities, utility system.
utillidor Thermally insulated, heated conduit (above or
below ground level) conveying water, steam, sewage and
fire pipes between buildings (USAF).
utilities control system In a complete reversal of meanings,
the UCS connects flight-control system, landing-gear
computers, fuel computers, right glareshields, computer
symbol generators and power generators.
utility 1 Generalized adjective for aircraft intended for,
or assigned to, variety of missions mainly of transport
nature but with limited payload; usually denotes odd-job
status but occasionally equipped with mission interfaces,
eg for photography, target towing or even surface attack
in limited war.
2 FAA = limited aerobatic category.
3 * glider – secondary or training glider.
utility finish Provides fabric with tautness and fill, but
lacks gloss.
utility system Usually loose term meaning that system
serves routine domestic functions not crucial to safety of
vehicle; occasionally means special system for specific
purpose, and sometimes even a standby emergency
system. Never involves flight control, navigation or
weapon release, but see utilities control system.
utilization 1 Proportion of total time an equipment is
available for use or is actually used.
2 Number of hours per year something, eg aircraft, is
used.
utilization rate 1 For civil transports, utilization (2).
2 For combat aircraft, flying rate, usually qualified
UxV
according to conditions, eg normal ** based on (say) 40-h
week; emergency ** based on maximum attainable on
6-day week; wartime ** based on 7-day week with
wartime crew, maintenance and safety criteria.
UTLS Upper troposphere [and] lower stratosphere.
UTM Universal transverse Mercator.
UTP 1 Unit test pilot.
2 Unshielded twisted pair.
3 Unit training plan (NATS).
UTR Universal [or uniform] temperature reference.
UTS Ultimate tensile strength.
U TS Velocity of tunnel test section (alternative to V TS ,
sometimes preferred for empty tunnel).
UTT Upper-tier technology.
UTTAS Utility tactical-transport aircraft system.
UTTEM Draft tactical technical economical requirement,
start of each new programme (Sweden).
UTTR Utah Test and Training Range, south of Salt
Lake City (USAF).
U/U Unusable [fuel].
UUA Urgent upper-air Pirep.
UUM 1 Unification of Units of Measurement; P adds
Panel (ICAO).
2 Former US category, underwater launch, underwater
target, attack missile.
UUPI Ultrasonic undercarriage position indicator.
UUT Unit under test.
UV 1 Ultra-violet.
2 Under-voltage.
3 Unmanned vehicle.
4 Upper sideband, voice.
U/V Under-voltage.
UVAS Unmanned vehicle for aerial surveillance.
UVDF U.h.f./v.h.f. D/F.
UVDS UV flame detector system.
Uverom Ultra-violet erasable read-only memory.
Uveprom UV erasable programmable ROM.
UVL UV laser.
UVM User view menu.
UVR UV-resistant [paint].
UVS 1 UV spectrometer, or spectrometry.
2 Unmanned-vehicle system[s].
UVSA Unmanned Vehicle Systems Association [West
Drayton UB7 8HP] (UK).
UVV Ultimate vertical velocity; landing-gear design
case.
UVVS Administration of the air force (USSR, obs.).
UW 1 Unconventional warfare.
2 Unique word.
UWAL University of Washington Aeronautical
Laboratory [Seattle, WA 98195–2400] (US).
UWB 1 Ultra-wideband [R adds radio].
2 Underwater battlespace.
UWNDS Upper-airspace wind[s].
UWR Ungrooved wet runway.
UWS Urgent weather Sigmet.
UWW Underwater weapons.
UWY Upper-airspace airway.
UXB Unexploded bomb.
UXO Unexploded ordnance.
UxV Unmanned air/land/sea vehicles.
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