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load from an aircraft
It took three
hours to unload the aircraft.
unloading point unloading point /n|ləυdŋ pɔnt/
noun the place where an aircraft is
unloaded
After taxiing, a marshaller
marshals the aircraft to the disembarkation
and unloading point.
unsaturated unsaturated /n|stʃəretd/
adjective  unsaturated air air that
does not contain the maximum amount
of water vapour for its temperature
unserviceable unserviceable /n|s%vsəb(ə)l/
adjective not operative
The aircraft
cannot be flown because the radio is
unserviceable. (NOTE: It is often abbreviated
in spoken English as U (you) S
(ess).)
unstick unstick /n|stk/ (informal) verb to
cause an aircraft to take off, or take off
in an aircraft  noun a take-off in an aircraft
update update /p|det/ verb to bring up to
date, to add the latest information to
something
Forecasts are updated and
reissued every four hours.
updraft updraft /pdrɑft/ noun US same as
updraught
updraught updraught /pdrɑft/ noun a rising
current of air
In cumulonimbus
clouds, there are updraughts of tremendous
force. Opposite downdraught
(NOTE: It is written updraft in US English.)
uplift uplift /plft/ noun the lifting of air by
surface features
Thunderstorms are
243 UV
triggered off by convection and/or orographic
uplift.
upper upper /pə/ adjective 1. at high altitude

upper air
upper winds
In
modern meteorological practice, upper
air analysis and the construction of
contour charts is carried out by computer.
2. top. Opposite lower  the upper
surface of the wing the surface of the
wing facing upwards, as opposed to the
underside
upper air chart upper air chart /pə eə tʃɑt/
noun a chart showing airflow pattern
and distribution of temperatures at specific
altitudes above about 10,000 feet
upper air route upper air route /pə eə rut/ noun
a route above FL245, approximately
24,500 ft. Abbreviation UAR
upper airspace upper airspace /pə eəspes/
noun the airspace above FL245,
approximately 24,500 ft. Abbreviation
UAS
upper information region upper information region noun
airspace which covers the same geographical
area as a flight information
region but above 24,500 ft. Abbreviation
UIR
upward upward /pwəd/ adjective moving or
directed up
As the aircraft accelerates
down the runway, the forces on the wing
tips and wing surfaces start reversing
direction and instead of being only
downward forces of weight, they
become upward forces of lift. (NOTE: In
US English, upward is used as an
adjective and as an adverb.)
upwards upwards /pwədz/ adverb towards
the top
Heat is transferred from the
Earth’s surface upwards by convection.
Opposite downwards
upwind upwind /p|wnd/ adverb against the
wind
The glider was released from the
aero-tow 3 miles upwind of the airfield.
Opposite downwind
urgency urgency /%d"ənsi/ noun importance
or need for prompt or fast action

Warnings, cautions and advisory messages
are displayed only when necessary
and are colour coded to communicate
the urgency of the fault to the flight
crew.
USA USA, US abbreviation United States of
America
usable usable /juzəb(ə)l/ adjective capable
of being used
On receiving the evacuate
order, cabin crew must assess if
their exits are usable.
usage usage /jusd"/ noun the act of using
something, consumption
Fuel flight
planning combines navigation data
with fuel usage.
use use noun /jus/ the act of using something,
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 UTC abbreviation Coordinated Universal
Time
utilisation utilisation /jutla|zeʃ(ə)n/, utilization
noun the act of making use of

Integral tanks are now favoured for aircraft
owing to the high utilisation of
space and reduction in weight.
utilise utilise /jutlaz/, utilize verb to
make use of
The most common type of
barograph is one which utilises an
　
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