The APU can provide electrical power up to what altitude?

The APU can provide electrical power up to what altitude?

• A. 40,000 ft
• B. 30,000 ft
• C. Maximum certified altitude
• D. 50,000 ft

Answer: (C)

APU electrical power is guaranteed only within the unit’s certified operating envelope, which matches the aircraft’s maximum certified altitude. In other words, the APU can supply power up to the altitude for which it is certified, and not beyond. The exact ceiling is tied to the aircraft’s certification, so the correct statement is that electrical power from the APU is available up to the maximum certified altitude. For context, on the A320, this is the altitude the aircraft is certified to fly, around FL410, and you wouldn’t rely on the APU for power above that limit.

APU electrical power is guaranteed only within the unit’s certified operating envelope, which matches the aircraft’s maximum certified altitude. In other words, the APU can supply power up to the altitude for which it is certified, and not beyond. The exact ceiling is tied to the aircraft’s certification, so the correct statement is that electrical power from the APU is available up to the maximum certified altitude. For context, on the A320, this is the altitude the aircraft is certified to fly, around FL410, and you wouldn’t rely on the APU for power above that limit.