Aviation

Aviation

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

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Aviation > Powerplant

oil-damped bearing

Aviation; Aircraft maintenance

A type of roller bearing installation in a gas turbine engine in which the outer race is installed in an oil damper compartment whose inside diameter is a few thousandths of an ...

quill shaft

Aviation; Aircraft maintenance

A type of shaft used to couple parts of an engine that are subject to torsional loads. A quill shaft is a long, hardened steel shaft with splines on each end. One end splines into ...

hertz

Aviation; Aircraft maintenance

A unit of frequency equal to one cycle per second.

millibar

Aviation; Aircraft maintenance

A unit of pressure in the metric system. One bar is a pressure of 14.5 psi, or 29.52 in. Hg. One millibar is one thousandth of a bar, or 0.01469 psi, or 0.02952 in. Hg.

rebuilt engine

Aviation; Aircraft maintenance

A used engine that has been completely disassembled, inspected, repaired as necessary, and reassembled, tested, and approved in the same manner and to the same tolerances and ...

velocity

Aviation; Aircraft maintenance

A vector quantity that expresses both the speed an object is moving and the direction in which it is moving.

iridium

Aviation; Aircraft maintenance

A very hard, brittle, highly corrosion-resistant, whitish-yellow, metallic chemical element. Iridium is used for the fine-wire electrodes in spark plugs that must operate in ...