What responsibility does the fire guard have during APU operation?

The responsibility of ensuring the safety of the APU and notifying of any leaks is vital during APU operation. The fire guard plays a crucial role in monitoring the APU’s environment to prevent any hazardous conditions that could lead to a fire or other safety incidents. This involves vigilant oversight for signs of fuel or oil leaks, which could pose significant risks if left unaddressed. The fire guard is trained to recognize these potential hazards and is responsible for alerting personnel to any irregularities. This proactive approach helps maintain operational safety and minimizes the risk of accidents or incidents associated with APU use.

Other responsibilities, such as visual monitoring or performing maintenance checks, are important but do not encompass the primary duty of actively ensuring the APU's safety during its operation. Starting the APU is typically handled by authorized personnel with specific training rather than the fire guard. Thus, the focus on safety and leak notification is central to the fire guard's operational role.