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The 787's internal cabin pressure is the equivalent of 6,000 ft (1,829 m) altitude resulting in a higher pressure than for the 8,000 ft (2,438 m) altitude of older conventional aircraft; [62] according to a joint study performed by Boeing and Oklahoma State University, such a level significantly improves comfort levels.
In aviation, pressure altitude is the height above a standard datum plane (SDP), which is a theoretical level where the weight of the atmosphere is 29.921 inches of mercury (1,013.2 mbar; 14.696 psi) as measured by a barometer. [2]
Aircraft cabin pressure is commonly pressurized to a cabin altitude of 8000 feet or less. 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.
“As the aircraft climbs, the cabin pressure will eventually settle to about 8,000 feet. So if you’re flying at 35,000 feet, the cabin will feel like you’re at 8,000 feet of altitude.”
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 ...
Most commercial aircraft that operate at high flight altitudes are pressurized at a maximum cabin altitude of approximately 8,000 feet. On most pressurized aircraft, if cabin pressurization is lost when the aircraft is flying at an altitude above 4,267 m (14,000 feet), compartments containing the oxygen masks will open automatically, either above or in front of the passenger and crew seats ...
When a plane has pressurization issues, pilots typically try to get below 10,000 feet as quickly and safely as possible. At higher altitudes, the air is thinner, which is why oxygen masks deploy ...
At cruising altitude, cabin pressure is set to what would be experienced between 6,000 to 8,000 feet above sea level, which can contribute to lower oxygen saturation in the blood.