PRESSURIZATION WITH LOSS OF THRUST
 

I want to know what will happen to cabin pressurization with loss of thrust on both engines on B737 say at FL 350 ?

Aviatorpk

A lot depends on how 'leaky' the hull is.

I've seen all packs turned off during a test flight on a 747, some A/C start to increase cabin altitude fairly quickly, but some enjoy a fairly slow increase.

On the B.A. 747 (G-BDXH)that lost all 4 engines due to volcanic ash the cabin pressure was indeed lost (or went above 14,000ft certainly), and the drill had to be carried out accordingly.

Thing is it won't be anything like an 'explosive' decompression, but it will be something that you will need to deal with in addition to the other events on your 'BAD DAY'!

Hope this is of help.


Regards Exeng

A/C are tested during maintenance for pressure decay rates and pressurisation leaks.Various limits apply, but in general the hull is supposed to retain pressure for long enough for the crew to take necessary action-i.e. height decrease or oxygen.