Originally Posted by
CONSO
That MAY- repeat MAY be due to basic design for FBW versus ' cable ' control backup design for 737 and prior.
I note that seattle times article today mentions that initial stab movement was supposedly limited to .6 degrees for flight envelope and even for extreme csse. Flight test apparently showed/proved it needed to be 2.5 degrees for extreme conditions- due to extra lift from engine cowlings at high AOA- but somehow the documentation approved never got that number changed And/OR even thenit was not considered critical, etc
NO matter how one slices it- the ' fix' was FUBAR - and forgot that AOA sensors can easily be bent orhit by birds etc
That they found it was necessary with 2,5 degrees might indicate that the aircraft might be way off the required natural stability without the help of any system.