Aviation

Aviation

Dealing with vehicles or machines used in flight or propulsion through the air.

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Aviation > Powerplant

active clearance control (ACC)

Aviation; Aircraft maintenance

A system for controlling the clearance between tips of the compressor and turbine blades and the case of high-performance turbofan engines. When the engine is operating at maximum ...

thermal anti-ice (TAI)

Aviation; Aircraft maintenance

A system used to prevent the formation of ice on an aircraft by flowing heated air inside the structure.

octane rating

Aviation; Aircraft maintenance

A system used to rate the antidetonation characteristics of a reciprocating engine fuel. Fuel with an octane rating of 80 performs in a laboratory test engine the same as the fuel ...

antidetonation injection (ADI) system

Aviation; Aircraft maintenance

A system used with some large reciprocating engines in which a mixture of water and alcohol is sprayed into the engine with the fuel when operating at extremely high power. The ...

stroboscopic tachometer

Aviation; Aircraft maintenance

A tachometer used to measure the speed of any rotating device without physical contact. A highly accurate variable-frequency oscillator triggers a high-intensity strobe light. ...

vertical tape instrument

Aviation; Aircraft maintenance

A tall rectangular instrument that displays the quantity of the parameter being measured by a movable strip of colored tape. The presentation resembles a vertical bar graph.

thermostatic valve

Aviation; Aircraft maintenance

A temperature-sensitive valve that controls the temperature of oil in an aircraft engine. When the oil is cold, the valve shifts and directs the oil through the oil cooler.