What is 'Vmc' in multi-engine aircraft?

'Vmc' refers to the minimum airspeed for controlled flight with one engine inoperative in multi-engine aircraft. This airspeed is crucial because it establishes the lowest speed at which the aircraft can maintain controlled flight given that one engine has failed. Below this speed, the aircraft may experience uncontrollable yaw towards the inoperative engine, leading to a potential loss of control.

Understanding Vmc is vital for pilots because flying below this speed during an engine failure scenario can be hazardous. The value of Vmc is influenced by various factors, including the design of the aircraft, its weight, and the configuration of the aircraft at the time of the engine failure. For safe operation, pilots must maintain airspeed above Vmc when attempting to manage an engine-out scenario to ensure they can control the aircraft effectively.