use noun /jus/ the act of using some-thing, or the state of being used . It must be ensured that smoke masks are available for use by employees within the aircraft. . runway in use runway currently being used for take-offs and landings . verb /juz/ to put something to work for a purpose . Gas turbine engines use low viscosity synthetic oil.
UTC abbreviation Coordinated Univer-sal Time
utilisation /jut.la.ze..(.)n/, utili-zation noun the act of making use of .
Integral tanks are now favoured for air-craft owing to the high utilisation of space and reduction in weight.
utilise /jut.la.z/, utilize verb to
make use of . The most common type of barograph is one which utilises an aneroid capsule mechanically con-nected to a pen.
UV abbreviation ultraviolet
V
vacuum /vkjum/ noun a space completely empty of everything includ-ing air . If the fuel tank vent pipe is blocked, a vacuum will form in the tank and fuel flow to the engine will be restricted.
valid /vl.d/ adjective 1. having offi-cial force or effect . All passengers should have valid passports. 2. worth taking seriously, acceptable because it is true or well-based . Significant weather charts use abbreviations and symbols to illustrate en route weather phenomena and are valid for a specified time. . a valid assumption a well-based supposition
validity /v.l.d.ti/ noun the state of being valid . the period of validity of a visa . Aerodrome forecasts included in VOLMET should have a validity period of 9 hours.
valley /vli/ noun an area of low-lying land between mountains or hills .
An example of a valley wind is the Mis-tral.
value /vlju/ noun 1. a quantity shown as a number . Deviation is not a constant value but varies from one air-craft to another. 2. the quality of being useful or desirable . the value of doing something the usefulness or worth of doing something
valve /vlv/ noun a mechanical device for controlling the flow of a fluid
valve overlap /vlv .υv.lp/
noun the period when both the exhaust and inlet valves are open together, with the exhaust valve closing and the inlet valve opening
valve seat /vlv sit/ noun an
angled ring in the cylinder head on
which the poppet valve sits when closed vane /ve.n/ noun a flat surface acted on by the wind or an airflow . A centrif-ugal compressor consists of a disc on which is formed a number of radially spaced vanes.
vapor /ve.p./ noun US same as
vapour vaporise /ve.p.ra.z/, vaporize verb
to turn into vapour . Water vaporises when heated.
vapour /ve.p./ noun the gaseous form of a liquid . Over desert areas, the lack of water vapour in the atmosphere produces cold nights. (NOTE: It is also written vapor in US English.)
vapour lock /ve.p. l.k/ noun a
blockage of fuel flow from a tank caused by a bubble of vapour at a high point in the pipeline
vapour trail /ve.p. tre.l/ noun a vis-ible trail of condensed vapour left behind by an aircraft flying at high alti-tude
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