"QRH lets you stay at planned level because it assumes descending to 25,000 might cause endurance issues."
Politely tend to disagree, QNH doesn't give a **** whether YOUR decisions see you land safely or end up in a smoking hole regards fuel awareness/management.
My thought was that in flight the pressurisation system had pumped the cabin up to required diffrentials and losing only one pack/bleed would be able to maintain that pressure.
A further problem in the remaining pack/bleed - well firstly you're having a really, really bad day, if a slow leak follow depressurisation, if an explosive depressurisation then all applicable checklists.
Was always a discussion point when training - in fairness no absolute right or wrong - most responses tended to be:
- stay where I am (reasons above)
- stay where I am and review procedures in case further problems
- descend to a more mid point cruise, more "comfortable"....whatever that meant.
Finally lead into a discussion about what happens when we arrive, MEL applied for the return trip, the biggest difference/consideration on the flight plan??
Cheers.