What is the maximum APU generator load?

What is the maximum APU generator load?

• A. 275A
• B. 250A
• C. 300A
• D. 325A

Answer: (A)

The limit you’re testing is set by the APU’s own generator rating and the aircraft’s electrical protection. The APU can power the aircraft electrical system only up to a specific current, and that ceiling is there to keep the APU operating within safe voltage, current, and thermal conditions while supplying power to essential systems and any nonessential loads that the system allows. In this configuration, the maximum allowable APU generator load is 275 amperes. If you try to pull more than that, protective circuitry will limit or shed loads or you’d need to bring engine-driven generators online to share the load. This keeps the electrical system stable and prevents damage to the APU or buses.

The limit you’re testing is set by the APU’s own generator rating and the aircraft’s electrical protection. The APU can power the aircraft electrical system only up to a specific current, and that ceiling is there to keep the APU operating within safe voltage, current, and thermal conditions while supplying power to essential systems and any nonessential loads that the system allows. In this configuration, the maximum allowable APU generator load is 275 amperes. If you try to pull more than that, protective circuitry will limit or shed loads or you’d need to bring engine-driven generators online to share the load. This keeps the electrical system stable and prevents damage to the APU or buses.