To maintain the pressure in the cabin equal to that at low altitude even while the airplane is at 30000 feet the incoming air is held within the cabin by opening and closing an outflow valve which releases the incoming air at a rate regulated by pressure sensors.

Airplane cabin pressure chart.
At 39000 feet 12000 m the cabin pressure would be automatically maintained at about 6900 feet 2100 m 450 feet 140 m lower than mexico city which is about 115 psi 79 kpa of atmosphere pressure.
Pressurization happens via the engines which compress incoming air heat it up and then divert some of.
The pressure differential varies between aircraft types typical values are between 78 psi 54 kpa and 94 psi 65 kpa.
Cabin air pressure although aircraft cabins are pressurized cabin air pressure at cruising altitude is lower than air pressure at sea level.
Michel palomeque flight safety advisor a318a319a320a321 program 1 introduction this document intends to describe the experience regarding the in service residual cabin pressure the consequences and the different scenarios for this residual cabin pressure.
For our example let us keep the cabin altitude constant at 6000 feet.
An 8000 ft cabin at 23000 ft is also 5 psid a 15000 ft delta.
For that purpose a short review of the system is presented.
The cabin pressure control system provides cabin pressure regulation pressure relief vacuum relief and the means for selecting the desired cabin altitude in the isobaric and differential range.
So you can have a higher spread between ambient and cabin altitudes for a given differential pressure at higher ambient altitudes because the rate of slope of the pambaltitude curve is flatter as you go higher.
The cabin pressure altitude will always be less than 8000 feet since people can live comfortably up to that altitude without significant loss of performance or stress on the respiratory system.
Is there a chart or formula which would indicate the cabin pressure versus sea level pressure at 55.
Think of a pressurized cabin as a balloon that has a leak but is being inflated continuously.
At typical cruising altitudes in the range 11 00012 200 m 36 00040 000 feet air pressure in the cabin is equivalent to the outside air pressure at 18002400 m 60008000 feet above sea level.
In addition dumping of the cabin pressure is a function of the pressure control system.
Yet i have been unable to find a chart.
All airplane cabins are pressurized to simulate the amount of pressure felt at 8000 feet.
As i am reading various responses i am guessing that it may be close to 13000 ft msl.
Residual cabin pressure by.
The cabin altitude of a pressurised aircraft is normally maintained at and altitude of 8000 ft or less as a compromise between the physiological needs of the crew and passengers and the structural limitations of the aircraft.
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