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unaccompanied unaccompanied /nə|kmpənid/
adjective  unaccompanied baggage
baggage that travels on a different flight
from the passenger who owns it.

accompanied
uncontrolled airspace uncontrolled airspace
/nkəntrəυld eəspes/ noun airspace
in which air traffic control does not provide
a service and in which an ATC
clearance is not required to fly
While
first learning to handle an aircraft, student
pilots fly in uncontrolled airspace.
(NOTE: Pilots must still follow certain
rules when flying through uncontrolled
airspace.)
uncoordinated flight uncoordinated flight noun flight,
especially during turns, in which the
horizontal and vertical forces acting on
the aircraft are out of balance. This can
result in the aircraft going into a slip or
a skid.
undercarriage undercarriage /ndəkrd"/ noun
the landing gear of an aircraft
To
reduce the effect of drag by fixed undercarriages
a retractable type of undercarriage
was introduced. (NOTE: The
undercarriage is often called the landing
gear or simply gear.)
COMMENT: The main landing gear are
nearest the aircraft’s centre of gravity.
Main landing gear are designed to
withstand a greater landing shock than
the nose wheel or tail wheel and
consequently should make contact
with the surface first when landing.
undercarriage assembly undercarriage assembly
/ndəkrd" ə|sembli/ noun wheels,
struts and linkages which make up the
complete unit
undergo 242
undergo undercarriage down and locked
/ndəkrd" daυn ən lɒkd/ noun
confirmation that the undercarriage is
secure in preparation for landing
undergo undergo /ndə|$əυ/ verb to experience,
to pass through a process
When
water changes from vapour to liquid,
energy is released into the atmosphere
which is thus warmed, although the
water itself does not undergo a change
of temperature. (NOTE: undergoing –
underwent – has undergone)
underlying underlying /ndə|laŋ/ adjective 1.
being under
Thermal modifications
occur when the temperature of the
underlying surface differs from that of
the source region. 2. forming the basis
of a theory or principle
The principle
underlying the construction of a mercury
barometer has not changed since
1643, when Torricelli first demonstrated
that the atmosphere has weight.
undershoot undershoot /ndə|ʃut/ verb to
land before, or in front of the intended
target
Because of the strong wind, the
student pilot undershot the runway and
landed before the runway threshold.
underside underside /ndəsad/ noun the surface
underneath something
The
underside of the wing should be carefully
inspected for damage or leaks.
undertake undertake /ndə|tek/ verb to do

In light aircraft, pilot/passenger communication
can be satisfactorily undertaken
verbally on a one to one basis.
(NOTE: undertaking – undertook –
has undertaken)
undulating undulating /ndjυletŋ/ adjective
rising and falling in gentle slopes

Flight over undulating terrain will
result in changing indications of aircraft
height on the indicator of the radio
altimeter.
uniform uniform /junfɔm/ adjective the
same, not varying in quality, dimensions,
etc.
An engine should be run at
low r.p.m. (revolutions per minute) after
flight to allow engine components to
cool to a uniform temperature.
unique unique /ju|nik/ adjective the one
and only of its sort, having no like or
equal
The pulse coded message contains
a unique 4-number identification.
unit unit /junt/ noun 1. a quantity or
amount used as a standard, an accepted
measurement
The internationally
agreed unit of pressure is the millibar.

The higher the sun is in the sky, the
more intense is the radiation per unit
area. 2. a person, group or device, complete
in itself
The operation of flying
controls is by means of self-contained
power flying control units (PFCUs).
universal universal /jun|v%s(ə)l/ adjective
affecting all or everybody
The use of
fly-by-wire systems in airliners was
delayed to allow thorough development
and encourage universal acceptance of
the new technology.
Coordinated
Universal Time
unload unload /n|ləυd/ verb to remove a
　
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