Plain English Meaning

The slowest speed at which a twin-engine airplane can still be flown straight if one engine quits. Slower than this, the rudder isn't strong enough to stop the airplane from yawing toward the dead engine.

Full Definition

The minimum airspeed in a multi-engine airplane at which it is possible to maintain directional control with the critical engine suddenly inoperative and the remaining engine at takeoff power. Below this speed, the rudder can no longer counteract the yawing force produced by the operating engine, and controlled flight cannot be maintained.

Context Anchor

Seen in multiengine training, airplane flight manuals, and on many multiengine indicators as a .