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The pressure differential varies between aircraft types, typical values are between 540 hPa (7.8 psi) and 650 hPa (9.4 psi). [35] At 39,000 ft (11,887 m), the cabin pressure would be automatically maintained at about 6,900 ft (2,100 m), (450 ft (140 m) lower than Mexico City), which is about 790 hPa (11.5 psi) of atmosphere pressure. [34]
The aircraft is pressurized and was designed for a 6.5 psi (45 kPa) differential pressure, giving an 8,000 ft (2,438 m) cabin pressure at its maximum altitude of 28,000 ft (8,534 m). [ 8 ] The turbine version of the Evolution is powered by the 750 hp (559 kW) Pratt & Whitney PT6A-135A and has a maximum cruise of 300 kn (556 km/h) at 25,000 ft ...
That means that the pressure is 10.9 pounds per square inch (75 kPa), which is the ambient pressure at 8,000 feet (2,400 m). Note that a lower cabin altitude is a higher pressure. The cabin pressure is controlled by a cabin pressure schedule, which associates each aircraft altitude with a cabin altitude.
In the aftermath of the incident aboard an Alaska Airlines 737 Max 9, we look at what happens when an aircraft experiences a sudden loss of cabin pressure and the risks for those on board.
The auto pressure controllers are programmed to keep the cabin altitude as low as possible, consistent with not exceeding the max allowed pressure differential for outside-to-inside, of approximately 8.6 PSI (various aircraft can vary a little, from that number, up or down).
With this positioning, an average pressure can be taken, which allows for more accurate readings in specific flight situations. [1] An alternative static port may be located inside the cabin of the aircraft as a backup for when the external static port(s) are blocked. A pitot–static tube effectively integrates the static ports into the pitot ...
A photo taken by passenger Jaci Purser after the Delta flight she was on returned to the airport due to a cabin pressure issue that caused bloody noses and other problems for passengers. - Jaci Purser
In 1996, the FAA adopted Amendment 25–87, which imposed additional high-altitude cabin-pressure specifications, for new designs of aircraft types. [25] For aircraft certified to operate above 25,000 feet (FL 250; 7,600 m), it "must be designed so that occupants will not be exposed to cabin pressure altitudes in excess of 15,000 feet (4,600 m ...