What should be done first in the event of an engine failure?

In the event of an engine failure, establishing and maintaining best glide speed is crucial as it allows the pilot to maximize the aircraft's altitude and distance, giving the best chance to reach a suitable landing area. The best glide speed is specifically designed to optimize the lift-to-drag ratio, helping to sustain flight longer and control the aircraft effectively during the critical moments following an engine failure.

This action ensures that the pilot can manage the aircraft's descent in a controlled manner while assessing the situation and determining the best course of action, whether that includes looking for a place to land or notifying authorities. Establishing best glide speed not only provides immediate control of the aircraft’s descent but also buys the pilot time to troubleshoot or make decisions regarding landing options without sacrificing safety.

Other actions, such as notifying air traffic control, landing at the nearest airport, or performing a fuel check, may be important parts of addressing the engine failure, but they should come after ensuring that the aircraft remains under control and at the suitable glide speed to maximize the chances of a safe outcome.