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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 ...
An airliner fuselage, such as this Boeing 737, forms an almost cylindrical pressure vessel.. Cabin pressurization is a process in which conditioned air is pumped into the cabin of an aircraft or spacecraft in order to create a safe and comfortable environment for humans flying at high altitudes.
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.
Pressure for paint exiting an HVLP (low-pressure) paint spray gun [51] 70 kPa Pressure inside an incandescent light bulb [52] 75 kPa Minimum airplane cabin pressure and lowest pressure for normal breathing (at 2440 m) and also the limit stated by the Federal Aviation Regulation (FAR) [53] 80 kPa 12 psi
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Cabin pressurization is the active pumping of compressed air into the cabin of an aircraft in order to ensure the safety and comfort of the occupants. It becomes necessary whenever the aircraft reaches a certain altitude, since the natural atmospheric pressure would be too low to supply sufficient oxygen to the passengers.
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).
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