Originally Posted by
Peter H
I wondered this when Icelandair were doing flaps-1 ferries, and found this:
In
https://leehamnews.com/2019/09/27/bj...-wire-part-10/
MCAS is not active on the 737 MAX when flaps are deployed. This is because when flaps are out the slats are out as well and these
diminish the disturbance to the pitch moment curve from the larger and further forward-higher slung engine nacelles.
That is also an excellent link on FBW pitch augmentation, relevant to the above discussion, and the opposite of what MCAS does.