Question

As the APU temperature passes through 732°C, the APU automatically shuts down. What other indications will alert you that an APU over-temperature has occurred?

a) Audible alarms and cockpit warning lights
b) Decreased fuel consumption
c) Increase in cabin pressure
d) No specific indicators

Answer 1

When the APU overheats, it shuts down automatically, and pilots are alerted by audible alarms and cockpit warning lights, which serve as primary indicators of an APU over-temperature event.

Step-by-step explanation:

When the APU temperature passes through 732°C and an over-temperature occurs, the APU will automatically shut down. Along with this shutdown, other indications typically include audible alarms and cockpit warning lights. These are standard safety features designed to alert the pilots of potential issues so they can take appropriate action. Specifically, an audible alarm ensures that even if visual cues are missed, the sound will attract the pilot's attention, and cockpit warning lights provide a clear visual indication of the system affected, in this case, the APU. The answer to the question is option a) Audible alarms and cockpit warning lights.