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

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How many batteries are required to start the APU if bleed air is available?

Two batteries
One battery
Three batteries
No batteries required

The correct answer is: One battery

The APU (Auxiliary Power Unit) start procedure can vary based on the specific aircraft model and the systems in use. However, in many cases, when bleed air is available, only one battery is required to start the APU. This is because bleed air from the aircraft engines or another source provides the necessary airflow for the APU to ignite and start, thereby reducing the electrical load typically required for starting. The use of one battery suffices to provide initial power for the APU's control systems and ignition, aligning with standard operational procedures outlined in the aircraft's manual. In scenarios where bleed air is not available, additional batteries or alternative starting procedures may be necessary to supply the required electrical and pneumatic energy for the APU start. This context clarifies the reliance on bleed air to simplify the APU starting process and minimizes battery usage when it is accessible.