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tolerance tolerance /tɒlərəns/ noun an allowable
variation in something which can
be measured
a tolerance of 2°
a tolerance
of 1mm (millimetre)
tone tone /təυn/ noun a sound of one pitch

The ground transmits a code in two
short bursts each of which is modulated
with two tones.
tool kit tool kit /tul kt/ noun a set of tools
consisting of spanners, screwdrivers,
pliers, etc.
top top /tɒp/ noun the highest point or part

If cumulonimbus clouds cannot be
avoided then flight through the top is
less hazardous than through the centre
or bottom of the cloud.
top-dead-centre top-dead-centre /tɒp ded sentə/
noun the position of the piston at the
extreme top of its stroke in a piston
engine
Ignition should occur just
before top-dead-centre.
topic topic /tɒpk/ noun the subject of
something heard, said, written or read

The first section in the book deals with
the topic of airmanship.
topographical topographical /tɒpə|$rfk(ə)l/
adjective referring to topography
An
advantage of using airfield QNH is that
altimeter readings can be compared
directly with heights represented on
topographical maps.
topography topography /tə|pɒ$rəfi/ noun 1. a
representation of detailed natural and
man-made features of the Earth’s surface
as represented on a map
The
chart shows the topography of the area.
2. relative elevations of the Earth’s surface,
or features of a geographical area

The general circulation is complicated
because the Earth tilts and its surface
is neither level, because of topography,
nor uniform due to areas of land
and sea.
tornado tornado /tɔ|nedəυ/ noun a violent
storm of small extent, with rotating
winds
The winds of a tornado are of
hurricane force.
torque torque /tɔk/ noun a moment of forces
causing rotation
Torque forces try to
bend the propeller against the direction
of rotation.
High current flows
through both the field and armature
windings producing the high torque
required for engine starting.
torquemeter torquemeter /tɔkmitə/ noun a
device for measuring forces (torque)
causing rotation
Engine torque is used
to indicate the power that is developed
by a turboprop engine and the indicator
is known as a torquemeter.
torsion torsion /tɔʃ(ə)n/ noun twisting,
especially of one end of a body while
the other is fixed
Rivets are subjected
to torsion and may break.
torsion load torsion load /tɔʃ(ə)n ləυd/ noun
the load caused by twisting of a structure
total total /təυt(ə)l/ adjective complete,
whole
Of the total amount of radiation
emitted by the sun, the Earth
receives only a very small part.  total
system failure complete system failure
 total seating capacity the maximum
number of passengers who can be
accommodated on seats
touch down touch down /ttʃ daυn/ verb to
make controlled contact with the landing
surface after a flight
If the atmospheric
pressure at an airfield is 1,000
millibars (mb) and that pressure is set
on the sub-scale of an aircraft altimeter,
when the aircraft touches down at the
airfield, the altimeter will read zero.
touchdown touchdown /ttʃdaυn/ noun the
moment, after a flight, when the aircraft
makes controlled contact with the land-
235 transform
ing surface
One of the aircraft’s tyres
burst on touchdown.
touchdown point touchdown point /ttʃdaυn
pɔnt/ noun the place on the runway
where the aircraft undercarriage first
touches the ground on landing
tow tow /təυ/ verb to pull an aircraft or
vehicle using a bar, rope, etc. attached
to another aircraft or vehicle
The
glider was towed into the air by a Rollason
Condor.
tower tower /taυə/ noun a tall airport or airfield
air traffic control building
Wait
for permission from the tower before
crossing an active runway.
‘T’ piece adapter ‘T’ piece adapter /ti pis ə|
dptə/ noun a device for connecting
two inputs to one output or vice versa
track track /trk/ noun a projection on the
Earth’s surface of the path of an aircraft,
which can be expressed in degrees from
north
Where an aircraft track and
wind direction are the same, there will
　
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本文鏈接地址：Dictionary of Aviation下(93)