Where should the qualified APU operator be located during operation?

The qualified APU operator should be located within earshot of the APU fire warning system to ensure they can promptly respond to any potential emergencies. Being within earshot allows the operator to hear alarms or alerts that indicate malfunctions or fire conditions, facilitating a rapid and appropriate response to safeguard personnel and the aircraft. This proximity is critical because situations involving the APU can develop quickly, and timely intervention can be essential in preventing escalation or ensuring safety.

The other locations suggested do not provide the same level of readiness to respond to emergencies. For instance, being in the cockpit would limit direct awareness of APU-specific alerts since the cockpit is designed for primary flight control and operation, and could be several meters away from the APU itself. Proximity to the fuel system, while important for operational checks, does not necessarily enhance the operator’s ability to respond to fire warnings. A remote control room would be even more distant, severely limiting the operator's ability to hear necessary alarms and respond in a timely manner. Thus, being within earshot of the APU fire warning system is the most effective position for ensuring safety during operation.