Appliance

Appliance means any instrument, mechanism, equipment, part, apparatus, appurtenance, or accessory, including communications equipment, that is used or intended to be used in operating or controlling an aircraft in flight, is installed in or attached to the aircraft, and is not part of an airframe, engine, or propeller.

Source

14 CFR § 1.1

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Scoping language

As used in Subchapters A through K of this chapter, unless the context requires otherwise:

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