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During my commercial ground school today, we were asked if turbojet and turboprop aircraft are defined differently by the FAA. While I know the answer is yes, I don't know where in Title 14 the answer can be found. I've searched multiple resources for over two hours.

Thanks!

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    – Ralph J
    Mar 3, 2021 at 2:58

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The FAA does not define the terms turboprop and turbojet in the FARs. These terms are defined in the Pilots Handbook of Aeronautical Knowledge.

  • Turbine engine. An aircraft engine which consists of an air compressor, a combustion section, and a turbine. Thrust is produced by increasing the velocity of the air flowing through the engine.

  • Turbocharger. An air compressor driven by exhaust gases, which increases the pressure of the air going into the engine through the carburetor or fuel injection system.

  • Turbofan engine. A fanlike turbojet engine designed to create additional thrust by diverting a secondary airflow around the combustion chamber.

  • Turbojet engine. A turbine engine which produces its thrust entirely by accelerating the air through the engine.

  • Turboprop engine. A turbine engine which drives a propeller through a reduction gearing arrangement. Most of the energy in the exhaust gases is converted into torque, rather than using its acceleration to drive the aircraft.

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