What should be done to reestablish AC power if it is lost?

To reestablish AC power after a loss, it is essential to refer to the appropriate checklist, which in this case is the Leaving the Airplane Checklist. This checklist outlines the necessary steps to safely secure the aircraft systems and ensure that power is restored following a loss of AC power. Utilizing the checklist helps maintain safety and allows for methodical troubleshooting and corrections, which are critical in managing aircraft systems effectively.

Relying on the checklist ensures that actions taken are systematic and within operational procedures, which is especially important in high-pressure situations. This process not only aids in restoring power but also assists flight crews in documenting the incident correctly and preparing for any follow-up procedures.

The other responses do not align with standard operating procedures for addressing power loss. For instance, waiting for a manual restart does not actively address the issue, and immediately restarting the engines may not be a safe or viable solution without first assessing the complete power situation. Calling maintenance for assistance can be necessary but is not the immediate action to take for reestablishing AC power, as the checklist provides a direct procedure to follow in such scenarios.