Definition
A gas turbine engine is an internal combustion engine that produces power by continuously drawing in air, compressing it, mixing it with fuel and igniting it, and then passing the resulting hot, expanding gases through a turbine. The turbine extracts energy from the gas flow to drive the compressor and, depending on the engine type, to drive a propeller, a rotor, or to produce thrust directly through a jet exhaust.
Plain English
An engine that sucks in air, squeezes it, burns fuel in it, and uses the hot rushing gases to spin a turbine wheel that powers the aircraft.
Context Anchor
Seen when studying turbine-powered airplanes, including turbojet, turbofan, and turboprop aircraft.
Derivation
From 'gas' (the hot expanding combustion gases that drive the engine) and 'turbine' (from the Latin 'turbo,' meaning a spinning or whirling thing). The name describes the core idea: hot gas spins a wheel.
Why Pilots Care
Most jets and many high-performance aircraft use gas turbine engines. Pilots must know their operating principles, temperature limits, and response to throttle changes to fly them safely.
Intuition Check
Gas does not mean automotive gasoline here. It means the hot expanding gases created when air and fuel burn inside the engine.
Example Sentence 1
Before flying the King Air, the pilot completed a transition course covering the operation of its gas turbine engines.
Example Sentence 2
Before the cross-country flight the mechanic performed a borescope inspection of the gas turbine engines to check for internal wear.