How do you perform an emergency APU shutdown?

Performing an emergency APU shutdown is a critical procedure that must be executed correctly to ensure safety and prevent potential hazards. The correct method involves entering the nosewheel well and setting the APU emergency shutdown switch to shutdown. This approach is designed to directly address an emergency situation where the Auxiliary Power Unit (APU) may be malfunctioning or posing a danger.

Entering the nosewheel well gives access to the APU's emergency shutdown mechanism, which is specifically designed for such circumstances. This method allows for an immediate and controlled shutdown of the APU, mitigating the risk of fire or further mechanical failure.

The other options are not recommended for completing an emergency shutdown effectively. Setting the APU emergency shutdown switch to off without being in the appropriate location may not ensure immediate response to the situation. Simply opening door 13L to check for issues is not a proactive measure and could delay the necessary shutdown actions. Cutting power from the cockpit may not provide a direct response to the APU and could result in complications if the APU is still in operation. Therefore, accessing the APU directly through the correct means is essential for effective emergency management.