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

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What does the APU battery primarily power?

  1. The APU inlet door

  2. The electric start motor only

  3. The fire detection system

  4. The APU fuel valve

The correct answer is: The electric start motor only

The APU (Auxiliary Power Unit) battery primarily powers the electric start motor. The electric start motor is a critical component necessary for initiating the operation of the APU, which provides electrical power and pneumatic pressure for starting the main engines and operating aircraft systems while on the ground or during engine failure scenarios. While the other components mentioned may have some reliance on the APU or its systems, they do not directly correlate to the primary function of the APU battery. The APU inlet door, fire detection system, and APU fuel valve are typically powered by other electrical sources in the aircraft and not exclusively by the APU battery. Therefore, the role of the battery is specifically tied to the electric start motor, making it the accurate choice regarding what the APU battery primarily powers.

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