If it becomes necessary to shut down one of the two engines on an air carrier airplane, what action shall the pilot in command take?

In the event that a pilot in command needs to shut down one of the two engines on an air carrier airplane, the appropriate action is to land at the nearest suitable airport in point of time. This is because the primary concern during such an emergency is to ensure the safety of the aircraft and its occupants by minimizing flight time and distance to the ground.

The nearest suitable airport is typically defined as the closest airport where the aircraft can land safely, taking into account factors such as runway length, surface conditions, and emergency services available at the airport. Prioritizing the nearest suitable airport allows the pilot to quickly address the emergency situation and ensures that assistance can be rendered promptly if needed.

This approach aligns with safety protocol and common practices in aviation, wherein the focus is on managing critical situations through timely and appropriate responses. In contrast, other options may not prioritize the immediacy required in an emergency landing scenario. For example, choosing to land at a military airport or returning to the departure airport may introduce unnecessary risks or delays in an emergency context, as the closest suitable airport approach is primarily about swift safety. Therefore, the correct response emphasizes optimal decision-making in the face of in-flight engine failure.