Hi alexban,
just a little question to see if what I am thinking is completely out of the line
Imagine the aircraft dispatched with, let's say, Left Pack Inop. The MEL/DDPG ask you to select the affected pack "OFF" and Isolation Valve switch "CLOSE". After takeoff you have a right bleed trip off. You end up to a point where you have to close the pack switch on the right side. Before doing that, can you just open the isolation valve (or select it auto) and leaving the right pack AUTO ? You will be feeding the right pack with left bleed air. Is that the way you could manage such a situation ?