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tubing tubing /tjubŋ/ noun tubes in general
hydraulic tubing
tubular tubular /tjubjυlə/ adjective referring
to something which is shaped like
a tube Diagonal members can be of
angle section, box spar or tubular in
shape.
tune tune /tjun/ verb 1. to set a system at
its optimum point by careful adjustment
The engine has not been properly
tuned. 2. to adjust to the particular frequency
of the required signal The RBI
shows the bearing of the tuned radio
beacon with reference to the aircraft’s
heading.
tuner tuner /tjunə/ noun a part which
allows the operator to select the particular
frequency of the required signal
The tuner reduces interference.
turbine turbine /t%ban/ noun a rotary motor
or engine formed of a wheel driven by a
flow of air or gas
turbo- turbo- /t%bəυ/ prefix turbine
turbocharger turbocharger /t%bəυ| tʃɑd"ə/
noun a supercharger driven by a turbine
powered by exhaust gases The turbocharger
significantly increases engine
power.
turbofan turbofan /t%bəυfn/ noun a jet
engine in which most of the thrust is
produced by air, accelerated by a large
fan, which does not pass through the
combustion chamber of the engine
The Airbus A340 is powered by four
CFM56 turbofans. (NOTE: The US term
is fanjet.)
COMMENT: Turbofan engines are
much quieter than older turbojets and
make a characteristic sound when in
operation. The fan can be clearly seen
in the front part of the engine. Modern
airliners use turbofan engines
produced by major manufacturers
such as Rolls Royce, CFM or Pratt and
Whitney.
turbojet turbojet /t%bəυd"et/ noun a jet
engine which includes a turbine-driven
compressor for the air taken into the
engine The de Havilland Comet was
the world’s first turbojet commercial
transport aircraft.
COMMENT: In recent years turbofan
engines have taken over from turbojet
engines. Frank Whittle (1907–96) was
an English engineer and RAF officer
who invented the turbojet aircraft
engine. Whittle developed a jet aircraft
by 1941 and the first military jet
aircraft, the Gloster Meteor, became
operational in 1944.
turboprop turboprop /t%bəυprɒp/, turbopropeller
/t%bəυprə| pelə/ noun a turbojet
engine in which the turbine also
drives a propeller The turboprop
239 tyre
engine is often used in transport aircraft.
COMMENT: Turboprop aircraft are
efficient at lower speeds than turbojet
aircraft and are often used for shorthaul
operations.
turboshaft turboshaft /t%bəυʃɑft/ noun an
engine similar to a turboprop engine,
except that it is used primarily in helicopters
turbulence turbulence /t%bjυləns/ noun an
irregular motion of the atmosphere
turbulent turbulent /t%bjυlənt/ adjective
referring to the irregular motion of the
atmosphere When flying in turbulent
air conditions, an aircraft is subjected
to upward and downward gust loads.
turn turn /t%n/ noun 1. an angular change
in track a 180° turn The autopilot
may be engaged during a climb or
descent but not usually in a turn. 2. a
section of a wire which is wound 360°
around a centre The voltage in each
winding is directly proportional to the
number of turns in each winding. verb
1. to make an angular change in track
turn right Turn to the west. 2. to rotate
The crankshaft turns through 720° for
every cycle of four strokes. turn the
knob rotate the knob or control 3. to
turn (in)to to change state As it
descends into warmer air, snow turns
into rain. 4. to find a page, section, passage,
etc., in a book Turn to page 64.
in turn 1. for its or their part Drag
must be overcome with thrust, which
requires engines, which in turn consume
fuel. 2. one after the other Turn
off the magnetos in turn to check their
serviceability.
turnaround turnaround /t%nə| raυnd/ noun US
same as turnround
turn coordinator turn coordinator /t%n kəυ|
ɔdnetə/ noun an instrument that
shows the pilot if the aircraft is in coordinated
flight or if it is slipping or skidding
turn off turn off / t%n ɒf/ verb 1. to switch an
electrical device or system ‘off’ When
carrying out engine checks, turn off the
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Dictionary of Aviation下(97)
