What happens to Vcef on a wet runway?

Vcef, or the critical engine failure speed, is an important performance metric that can be influenced by runway conditions. On a wet runway, the availability of traction decreases due to the reduced friction between the tires and the surface. This can lead to an increased stopping distance and a longer time required to reach decision speeds. Because of this reduced available performance from the loss of traction, Vcef is effectively lower on a wet runway.

In the context of an aircraft taking off, if an engine failure occurs, the aircraft must have the ability to continue its takeoff safely. When Vcef decreases, it reflects the increased challenges posed by a wet runway, where maintaining control and ensuring safe flight during an engine failure is critical. Thus, understanding the impact of runway conditions like wetness on Vcef is crucial for pilots to manage takeoff and flight safety effectively.