757 Flight Deck A/C Packs
Hello All,
Just a quickie - if you're on the ground with only the R pack running, where (apart from equip cooling) does the F/D air come from? All the diagrams indicate it comes straight form the L pack, and not from the mix manifold.
The only thing I was wondering is whether some of the mix manifold air is able to sneakily creep back up 'towards' the L pack (as there is no pressure in the duct) and then enter the F/D that way.
Many thanks in advance for the info.
NW3