What does Ground Minimum Control Speed (VMCG) indicate?

Ground Minimum Control Speed (VMCG) is a critical performance parameter that indicates the minimum speed at which an aircraft can maintain directional control on the runway in the event of an engine failure during the takeoff roll. At this speed, the aircraft is capable of being controlled with the remaining operative engine(s) without developing uncontrollable yaw or losing control.

The importance of VMCG manifests especially in multi-engine aircraft, where the asymmetrical thrust produced by a failure of one engine necessitates precise control inputs to maintain a straight path during takeoff. This makes it essential for flight crews to know and understand VMCG, as it directly impacts safety procedures during critical phases of flight.

Understanding VMCG helps aircrew to determine if they can safely continue the takeoff if an engine fails shortly after departure. It is essential for pilots to recognize this speed to avoid a situation where they could become uncontrollable due to insufficient speed.