Where is the APU emergency shut down on the B737 aircraft?

The APU (Auxiliary Power Unit) emergency shut down on the B737 aircraft is located in the right main gear well. This is a designated area that allows ground crew and maintenance personnel to safely shut down the APU in emergency situations without needing access to the cockpit.

Placement of the emergency shut down here is strategic; it provides quick access in case of an emergency while minimizing the risk of exposure to the aircraft's operating systems that could be found in the cockpit. This location ensures that personnel can react promptly and effectively if an unexpected situation arises while the APU is in operation.

Locations such as under the passenger cabin or in the aft cargo area would not provide the same level of accessibility or safety in an emergency and may complicate quick response actions. Similarly, while there is an APU control in the cockpit for normal operations, for emergency situations, the right main gear well is the designated location to quickly shut down the system to ensure overall safety.