Maximum APU generator load (in flight or on ground) is which?

Maximum APU generator load (in flight or on ground) is which?

• A. 100%
• B. 50%
• C. 75%
• D. 125%

Answer: (A)

The key idea is that the APU’s generator has a defined rated capacity, and you keep the electrical load on it within that limit for safe, continuous operation. The maximum continuous APU generator load is 100% in both flight and on the ground. Pushing beyond that would over-stress the APU and the electrical system, risking overheating or voltage/frequency instability. Some systems may allow a brief transient overload (a higher percentage) for short periods, but that isn’t the normal maximum for continuous use.

The key idea is that the APU’s generator has a defined rated capacity, and you keep the electrical load on it within that limit for safe, continuous operation. The maximum continuous APU generator load is 100% in both flight and on the ground. Pushing beyond that would over-stress the APU and the electrical system, risking overheating or voltage/frequency instability. Some systems may allow a brief transient overload (a higher percentage) for short periods, but that isn’t the normal maximum for continuous use.