What is the first step in the engine failure after Vr checklist?

The first step in the engine failure after Vr checklist is to establish the best glide speed. This action is critical for maintaining control and maximizing the aircraft's glide distance in a situation where the engine has failed. By achieving the best glide speed, the pilot is optimizing the aircraft's performance and ensuring that they have the necessary airspeed to maintain control while looking for a suitable landing area.

This step is crucial because it allows the pilot to focus on managing the aircraft's descent effectively while considering options for a safe landing. It prioritizes immediate aerodynamic control over other considerations, such as declaring an emergency or looking for a place to land, which may come in subsequent steps as the situation develops. Notably, while checking the magnetos, declaring an emergency, or finding a place to land are important parts of emergency procedures, they become relevant after ensuring that the aircraft is at the optimal glide speed.