In multi-engine aircraft, what does VMC stand for?

VMC stands for Minimum Control Speed in multi-engine aircraft. This is the minimum speed at which the aircraft can maintain controlled flight with one engine inoperative. Understanding VMC is crucial for safety during takeoff and initial climb, as it defines the boundary below which the aircraft cannot be expected to maintain stable flight when one engine fails.

The concept of VMC is tied directly to the aircraft’s performance capabilities and the aerodynamic balance between the operating engine and the non-operating engine. If the aircraft drops below this speed while trying to climb with one engine out, it can lead to an uncontrollable yaw towards the inoperative engine, making recovery extremely challenging.

Knowledge of VMC is critical for pilots, as it affects flight planning, takeoff techniques, and emergency procedures. It is a fundamental marker for ensuring that a pilot can respond appropriately in the event of an engine failure, maintaining safety during multi-engine operations.