What is the first action to take when a pilot becomes incapacitated?

When a pilot becomes incapacitated, the foremost priority is to maintain control of the aircraft. Removing the incapacitated pilot from the controls is crucial to ensure that the aircraft can be flown safely and that the other crew members can effectively manage the situation. By taking control of the aircraft, the remaining pilot can maintain situational awareness, make necessary communications, and implement procedures that will lead to a safe resolution, whether that be returning to the nearest airport or preparing for an emergency landing.

Other choices, while important in certain situations, do not address the immediate need to secure the aircraft’s operation. Engaging the oxygen supply may be necessary if the incapacitation is due to hypoxia, but it does not address the control of the aircraft directly. Checking for injuries is also important, but that can be done after ensuring that the plane is being operated safely. Requesting assistance from the ground crew is also a critical step, but it comes after securing control of the aircraft. Therefore, the most immediate and vital action is to remove the incapacitated pilot from the controls, ensuring that the aircraft continues to be safely flown.