APU maximum operating altitude is?

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Multiple Choice

APU maximum operating altitude is?

Explanation:
APUs have a certified ceiling because their ability to deliver enough bleed air and electrical power depends on air density and cooling. As you climb, the air gets thinner, which reduces the APU’s compressor effectiveness and its cooling, making it harder to maintain the required power and temperatures. To ensure reliable operation, manufacturers set a maximum altitude for APU use. For most transport aircraft, that limit is 41,000 feet. So the highest altitude at which the APU can be operated with confidence is 41,000 feet. The lower altitude is within the limit, while higher altitudes exceed what the APU can reliably support.

APUs have a certified ceiling because their ability to deliver enough bleed air and electrical power depends on air density and cooling. As you climb, the air gets thinner, which reduces the APU’s compressor effectiveness and its cooling, making it harder to maintain the required power and temperatures. To ensure reliable operation, manufacturers set a maximum altitude for APU use. For most transport aircraft, that limit is 41,000 feet. So the highest altitude at which the APU can be operated with confidence is 41,000 feet. The lower altitude is within the limit, while higher altitudes exceed what the APU can reliably support.

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