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航空术语词典Dictionary of Aeronautical Terms 下

时间:2011-03-11 23:18来源:蓝天飞行翻译 作者:航空 点击:


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 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.

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