Hello...
assuming that you are in the cruising altitude, say at FL330..and your cabin altitude is ~5500 feet.
suddenly ! ....you lost your Pack 1+2.....
the ECAM will present the actions for that failure...and when it comes to "descent to FL100/MEA..."
1-do you have to initiate emergency descent or a normal descent ?
i would say...normal descent with R.O.D of ~2500-3000 fpm , because the oxy masks will drop at 14000 cabin alt.and you are away from this alt by 8500 feet(14000 - 5500 ) ...and you need to lose (33000-14000) = 19000 feet ...so 19000/2500fpm= 7.6 mins ...assuming the cabin climb rate is 1000 fpm...ofcourse this is all assumptions.
But...if you are FL390 with cabin alt of 8000...i would say you have to initiate emergency descent.
2-will the cabin climb rapidly/slowly ? i think it will climb slowly...but at the end of the day...it is not as bad as a rapid decompression.
3-at what rate you think the cabin climb rate will be (fpm) ? i think it will vary between new and old aircraft...
any suggestions...ideas to share
thanks in advance