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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]
System pressure is maintained at 1,250 to 1,500 psi (8.6 to 10.3 MPa) by a pressure regulator. On aircraft 25-181 and subsequent the variable volume engine driven pump delivers fluid under a pressure of 1,450 psi (10.0 MPa) to the system and static pressure is maintained at 1,500 to 1,550 psi (10.3 to 10.7 MPa).
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 ...
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.
The fuel must be reduced with altitude to maintain the same a/f ratio as the lower ambient pressure means less weight of air entering the engine (early engine controls used a Barostat or Barometric Pressure Control depending on the type of fuel pump, fixed or variable displacement). [20]
Bleed air in aerospace engineering is compressed air taken from the compressor stage of a gas turbine, upstream of its fuel-burning sections.Automatic air supply and cabin pressure controller (ASCPC) valves bleed air from low or high stage engine compressor sections; low stage air is used during high power setting operation, and high stage air is used during descent and other low power setting ...
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
Aircraft using piston engines use intake systems similar to automobiles. With the development of jet engines and the subsequent ability of aircraft to travel at supersonic speeds, it was necessary to design inlets to provide the flow required by the engine over a wide operating envelope and to provide air with a high-pressure recovery and low distortion.