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What Are The Physical Requirement Psi?

What is the PSI requirement in a passenger aircraft flying over 30,000 feet ?

  • Answer:

    There is no requirement and it has nothing to do with 30,000 feet. Most older jet aircraft keep the cabin pressurized to the equivalent of 8,000 feet, 10.9 psi, anytime they're above 8,000 feet. Newer aircraft like the A380 and 787 pressurize to 5,000 feet, 12.2 psi.

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The pressure differential is limited to about 8.6 psi on most aircraft, that means that at 30,000 feet where the ambient pressure is 4.3psi the total pressure is 12.9psi compared to 14.7psi at sea level. So, in a vacuum you'd get 8.6psi. At 30,000 feet you get 12.9psi and at 39,000 feet you get 11.5psi which is like being at 7,000 feet with no airplane around you.

Chris H

By law in the U.S., the cabin altitude in a pressurized airliner must not be greater than 8000 feet above sea level equivalent. This corresponds to a cabin pressure of 10.9 psi. The actual flying altitude of the aircraft is irrelevant.

Techwing

760 mmHg (torr) 29.92 inHg 14.696 psi 1013.25 millibars/hectopascal

Charly Brown

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