the Aviation Dictionary

turboiet aircraft - twist drill
turbojet aircraft - An aircraft having a jet engine in
which the energy of the jet operates a turbine that in
turn operates the air compressor.
determine the point along a course, prior to a turn WP,
where a turn should be initiated to provide a smooth
path to intercept the succeeding course, and to
enunciate the information to the pilot.
turbojet engine - A turbine engine that produces its
thrust entirely by accelerating- the air through the turn coordinator -- A rate gyro that senses both roll and
engine.
yaw.
turboprop aircraft - An aircraft having a jet engine in
which the energy of the jet operates a turbine that
drives the propeller.
turboprop engine - A turbine engine that drives a
propeller through a reduction gearing arrangement.
Most of the energy in the exhaust gases is converted
into torque, rather than its acceleration being used to
propel the aircraft.
turboshaft - A gas turbine engine geared to an output
shaft. Usually for rotorcraft installation, but also for
many marine and industrial uses.
turboshaft engine - A gas turbine engine that delivers
power through a shaft to operate something other than
a propeller.
turbulence - 1. In general, any irregular or disturbed
flow in the atmosphere. 2. In aviation, bumpiness in
flight.
turn WP [turning point] - A WP that identifies a
change from one course to another.
turnbuckle -A device used in a control system to adjust
cable tension. A turnbuckle consists of a brass barrel
with both left- and right-hand threaded terminals.
turning error - One of the errors inherent in a magnetic
compass caused by the dip compensating weight. It
shows up only on turns to or from northerly headings
in the northern hemisphere and southerly headings in
the southern hemisphere. Turning error causes the
compass to lead turns to the north or south and lag
turns away from the north or south.
turning points - Track changes often occur along
initial or intermediate approach segments of non-
RNAV procedures, some defined by DME and some
defined by radials or bearings.
turpentine - A thinner and quick drying agent used in
varnishes, enamels, and other oil-based paints.
turbulence in and near thunderstorms (TNT)- That
turbulence that occurs within, below, above, and
around developing convective clouds and several tools that can be selected as needed.
thunderstorms.
turbulent flow - A flow of fluid in an unsteady state.
turret - A tool mount on a lathe. The turret holds
turret lathe - A metal-turning lathe in which the cutting
tools are mounted in a turret for purpose of quick
change.
turbulent gusts - The atmospheric wind and vertical
motion fluctuations caused by turbulent eddies. tweak test -A test of the output of a wheel speed sensor
made by tweaking or flipping the sensor blade with the
turbulent wake - The turbulent eddies created near the
fingers to rotate it enough for it to generate a voltage.
ground when high surface winds are disrupted by
obstacles, such as hangers and other large buildings twelve point head -A standard head form for externally
located near an approach path. Also, the turbulent wrenched screws designed for use in counter-bored
region downwind of a thunderstorm.
holes.
turn -- To machine on a lathe.
turn and bank indicator - A flight instrument
consisting of a rate gyro to indicate the rate of yaw and
a curved glass inclinometer to indicate the relationship
between gravity and centrifugal force. The turn and
bank indicator indicates the relationship between angle
of bank and rate of yaw.
turn and slip indicator - See turn and bank indicator.
turn anticipation - 1. Turning maneuver initiated prior
to reaching the actual airspace fix or turn point that is
intended to keep the aircraft within established airway
or route boundaries. 2. The capability to manually or
automatically determine the point along a route of
flight, prior to a fly-by fix, where a turn should be
initiated to provide a smooth path to the succeeding
course. 3. The capability of RNAV systems to
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twelve-point socket - A socket wrench that has a
12-point double hex opening that makes it easy to
position on a bolt or nut.
twenty-minute rating - The ampere hour rating of a
battery indicating the amount of current that can be
drawn from a battery in order to discharge it in twenty
minutes.
twilight - Often called dusk, it is the period of
decreasing light from sunset until dark.
twin-row radial engine - A radial engine having two
rows of cylinders, one behind the other.
twist drill - A metal cutting tool that has a straight
shank and deep spiral flutes in its side and provides a
passage for the chips to be removed from the hole it is
cutting.