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TIT (turbine inlet temperature) (gas turbine engine parameter). The temperature of the gases from the
combustion section of a gas turbine engine as they enter the turbine inlet guide vanes or the first stage of
the turbine. TIT is the highest temperature inside a gas turbine engine and is one of the limiting factors of
the amount of power the engine can produce.
TIT is difficult to measure, but exhaust gas temperature, or EGT, which is the temperature of the
gas as it leaves the turbine, relates to TIT and is normally the parameter measured.
titanium. A strong, brittle, lustrous, silvery-gray, metallic chemical element. Titanium’s symbol is Ti, its
atomic number is 22, and its atomic weight is 47.90. Titanium is malleable when it is hot, but is hard and
brittle when it is cold. Titanium is used in its pure state or as an alloy with other metals to increase their
strength at high temperatures. Titanium is also used in the manufacture of some ceramic components.
titanium white (paint pigment). A brilliant white paint pigment that contains no lead. Titanium white
contains titanium dioxide, which is often mixed with barium sulfate and zinc oxide.
title block (aircraft drawing). An information block placed in the lower right-hand corner of an aircraft
drawing. This block includes the part number, the part name, and the names of the engineer, draftsman, and
checker.
TMC (thrust management computer). A component in the flight management system of a jet transport
aircraft that senses the engine parameters and power requests and controls the thrust produced by the
engines.
toe-in (airplane wheel alignment). The wheels of an airplane are toed in if lines drawn through the center
of the two wheels, perpendicular to the axles, cross ahead of the wheels. As the airplane moves forward,
toe-in causes the wheels to try to move closer together.
toe-out (airplane wheel alignment). The wheels of an airplane are toed out if lines drawn through the
center of the two wheels, perpendicular to the axles, cross behind the wheels. As the airplane moves
forward, toe-out causes the wheels to try to move farther apart.
To-From indicator (electronic navigation system component). An indicator used in aerial navigation
with the VOR, very-high-frequency omnirange navigation system. The To-From indicator shows the pilot
whether the aircraft is flying toward or away from the station if it is flying at the heading shown on the
omni bearing selector (OBS). When an aircraft passes over a VOR antenna, the To-From indicator changes
from To to From.
toggle (noun). A T-shaped handle fitted onto the end of a cable that is used to move some mechanical
Printed from Summit Aviation's Computerized Aviation Reference Library, 2/7/2007
Page 588
device.
toggle (verb). To alternate between two or more circuit configurations, normally by the operation of a
single switch.
toggle flip-flop. A digital building block that changes the logic state of its output each time a clock pulse is
received.
toggle switch. An electrical switch with a control handle in the form of a bat, or lever, sticking out of the
front of the switch. It is customary when installing a toggle switch to move the toggle up to turn the switch
ON, and down to turn the switch OFF.
tolerance (dimensions). The difference between the extreme allowable dimensions of a part.
toluene. A liquid hydrocarbon material much like benzene, but less flammable. Toluene is used as a
solvent and as an antiknock additive for gasoline used in reciprocating engines.
toluol. A commercial grade of toluene. See toluene.
ton. A unit of weight in the English system that is equal to 2,000 pounds.
tonne (metric ton). A unit of mass in the metric system equal to 1,000 kilograms or 2,204.62 pounds of
mass.
ton of refrigeration. A measure of the cooling effect of an air conditioning system. One ton of
refrigeration is the amount of cooling produced when one ton of ice melts in a 24-hour period.
top dead center (reciprocating engine piston position). See TDC.
top overhaul (reciprocating engine maintenance). The overhaul of the cylinders, valves, and pistons of a
reciprocating engine. A top overhaul does not include opening the crankcase or removing the connecting
rods from the crankshaft.
tornado (meteorology). A violently rotating column of air hanging down as a funnel-shaped cloud below a
cumulonimbus cloud. Tornadoes are the most destructive of all small-scale atmospheric phenomena.
toroidal coil (electrical component). An electrical inductor wound around a ring-shaped core made of a
highly permeable material. The ring-shaped core concentrates the magnetic flux and allows a minimum
amount of flux to be lost in an external field.
torque. A force that produces or tries to produce rotation.
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航空术语词典Dictionary of Aeronautical Terms 下(94)
