What is required during APU operations regarding fire safety?

During APU (Auxiliary Power Unit) operations, the presence of a mechanic in the flight station is necessary for several reasons. First, a mechanic can assess any potential issues with the APU or associated systems in real time, which is critical for maintaining safety during operations. They have the expertise to manage any irregularities or emergencies that may arise.

Also, having a mechanic present allows for immediate troubleshooting and intervention, which is crucial in the event of a malfunction. Their training prepares them to handle various scenarios that could pose a fire risk, ensuring that proper safety measures are followed. Ultimately, the presence of a knowledgeable individual in the cockpit enhances safety by providing immediate expertise during APU operations.

In contrast, while keeping a fire extinguisher nearby is a good general safety practice, it does not replace the expertise required to manage potential APU failures. Scheduling a fire pit burn is irrelevant to APU operations, and the use of fire retardant foam is not a standard requirement during normal APU operations. Therefore, having a mechanic present is vital for ensuring fire safety and effective response in the operational context.