What is maximum cabin pressure defferntial.?

Question

What is maximum cabin pressure defferntial.?

Answer 1

Max CPD, is the difference between the static airpressue out side of the aircraft, to the pressure maintained in the aircraft.

Transport Cat aircraft can only hold so much pressure, and to prevent structual damage from over pressurization, their have a max cabin differential, so if the cabin pressure is maintained at 8000' (typical for most aircraft), and the aircraft climbs up, and the pressure differential is exceeded, the outflow valve will open releasing some of the cabin pressure to keep it within the differential, making the cabin alitude increase to above 8000'

Answer 2

Typically a commercial jet will have a cabin no higher than 8,000 feet.  Differential is usually (on the ones I've flown) between 7.76 psi and a max of 8.06 psi.

Beyond that, there's structural damage, plain ole leaks around all the holes (doors, window exits, etc.) and lack of ability of the bleed air to provide the pressure needed.