TOLD Definitions

Question 1

Critical Engine Failure Speed (Vcef)

Answer 1

The speed at which one engine can fail and the same distance is required to either continue to accelerate to lift-off speed, or to abort and decelerate to a full stop.

Question 2

Critical Field Length (CFL)

Answer 2

Total length of runway required to accelerate on all engines to critical engine failure speed, experience an engine failure, then continue to lift-off or stop.

Question 3

Minimum Control Speed Ground (Vmcg)

Answer 3

88 KIAS, it is the minimum controllable speed during the take-off run, at which, when an engine is failed, it is possible to maintain directional control using only primary aerodynamic controls without deviating more than 25 feet laterally with all three wheels on the runway.