High Quality Content by WIKIPEDIA articles! The critical engine of a multi-engine, fixed-wing aircraft is the one whose failure would result in the most adverse effects on the aircraft's handling and performance. When one of the engines on a typical multi-engine aircraft becomes inoperative, a thrust imbalance exists between the operative and inoperative sides of the aircraft. This thrust imbalance causes several negative effects in addition to the loss of one engine's thrust. For reasons listed below, the left engine of a conventional twin-engine propeller-driven aircraft is typically considered critical. On certain aircraft, hydraulic, pneumatic or electrical systems may be powered by one engine. Since these are not aerodynamic effects, they do not cause an engine to be considered the 'critical engine'. However, it is important to understand the consequences of such system failures in the context of engine-failure scenarios.

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