Originally Posted by
DCT_ELSIR
..... WAI should be available through the isolation valve which is open in AUTO as you’ve turned a pack off?
..which however should be handled with care, since one bleed source, powering both wings with bleed air and one Pack, which then switches to High is quite demanding, with the risk of Trip Off not only above FL350, as mentioned in the NNC. Problems could occur when in the descent with the ENGs in idle, so planning a "Power-On"-descent could be helpful.