Originally Posted by
hoover
Take for instance if you lose a pack inflight. The qrh doesn't say you have to decend if you can maintain cabin but the MEL says you cant be dispatched above 250. We had a guy who knew this second to 250 then have to make a fuel stop. Sometimes knowing too much is a problem also.
That’s because one pack once up at cruise is capable hold pressurization, never go to the MEL in flight, in simpler terms it’s a dispatch deviation guide, again dispatch only.