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Aircraft cabin pressurization can be controlled via two different modes of operation.
Aeroplane cabin pressure. That s better because as the cabin altitude goes up you have less oxygen in your blood horning explains. If you re awake during ascents and descents you can do the necessary self care techniques when you feel pressure in your ears. The first is the isobaric mode which works to maintain cabin altitude at a single pressure despite the changing altitude of the aircraft.
Repeat several times especially during descent to equalize the pressure between your ears and the airplane cabin. Don t sleep during takeoffs and landings. Pressurization systems are designed to keep the interior cabin pressure between 12 and 11 psi at cruise altitude.
The major components for the pressurization control are the cabin pressure controller cpc outflow valve safety valve and negative pressure relief valve. Exterior and interior altitude profile on a typical flight. Cabin air management systems are even more sophisticated on modern aircraft like the 787 dreamliner where the pressure is lowered to equal 6 000 feet of altitude.
The pressure differential varies between aircraft types typical values are between 540 hpa 7 8 psi and 650 hpa 9 4 psi. At 39 000 feet 12 000 m the cabin pressure would be automatically maintained at about 6 900 feet 2 100 m 450 feet 140 m lower than mexico city which is about 790 hpa 11 5 psi of atmosphere pressure. The structural strength of the airplane determines how much differential pressure the cabin can tolerate a typical figure is eight pounds per square inch and the fuselages of new airplane designs are pressurized and depressurized many thousands of times during testing to ensure their integrity.
For example the flight crew may select to maintain a cabin altitude of 8 000 feet 10 92 psi. On a typical flight as the aircraft climbs to 36 000 feet the interior of the plane climbs to between 6000 8000 feet. Cabin pressure controller cpc the cabin pressure controller is the device used to control the cabin air pressure.
That s a far more comfortable.
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