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A flameout is an unintentional stopping of an internal combustion engine.

Strictly speaking, a flameout only refers to turboshaft or other continuous combustion engines. In a continuous combustion engine, fuel and air are continuously introduced to maintain the engine's combustion 'flame', and when the engine is operated outside normal parameters (such as air starvation, too little fuel, or changing the rate of fuel flow too quickly) the flame will extinguish, and the engine will no longer produce power. Reciprocating (piston) engines produce a new 'flame' every combustion cycle, although some source of ignition (such as a glow plug) may remain hot between cycles.

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