Which aspect of aircraft maintenance involves monitoring for APU fire indicators?

Monitoring for APU (Auxiliary Power Unit) fire indicators is critical during routine inspections. These inspections are designed to ensure that all aircraft systems are functioning correctly and safely before the aircraft is put into service. During a routine inspection, ramp agents and maintenance personnel will look for any signs of malfunction or hazards, including indicators related to the APU, which is vital for ground operations and passenger comfort.

Routine inspections allow for early detection of potential issues, which can prevent serious incidents from occurring. The APU is a crucial component of the aircraft's systems, and ensuring its proper functioning, including monitoring for fire indicators, is an essential task for maintaining safety standards.