General Authority of Civil Aviation (GACA) Aeronautical Information Publication (AIP) Practice Exam

What is the APU fire/overheat detection method?

1. FIRE detection only

2. FIRE and OVHT detection

3. Smoke detection only

4. Temperature sensors

The correct answer is: FIRE detection only

The correct answer is that the APU fire/overheat detection method includes both fire and overheat detection. This is crucial because an Auxiliary Power Unit (APU) can present risks for both fire and overheating conditions, necessitating a system that is capable of detecting both scenarios to ensure prompt action and safety. Fire detectors typically operate through various methods such as heat sensors or flame detectors. However, solely relying on fire detection could lead to dangerous situations if the APU were to overheat without showing any signs of flame, highlighting the importance of an integrated detection method that also monitors for overheating conditions. Other detection methods, such as smoke detection or temperature sensors, may be part of broader systems but do not provide the comprehensive coverage needed for APU safety. Thus, having a system that encompasses both fire and overheat detection ensures a more robust safety protocol, addressing the unique hazards posed by an APU.