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| | FAR Part 1 |
 | | "Aircraft" means a device that is used or intended to be used for flight in the air. |
 | | "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. |
 | | "Powered-lift" means a heavier-than-air aircraft capable of vertical takeoff, vertical landing, and low speed flight that depends principally on engine- driven lift devices or engine thrust for lift during these flight regimes and on nonrotating airfoil(s) for lift during horizontal flight. |
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