Originally Posted by
yoko1
Yes, and many similar articles since the first aircraft accident.
If the pilot released the controls and the aircraft continued to pitch up "all by itself", then I would agree with you. That would have been an example of negative static stability. The fact that there were still "pull" forces present means that if the stick was released, then the pitch would, at a minimum, stop increasing (neutral stability) and likely decrease (positive stability). There is nothing, anywhere, in any data released to date that states that the 737 demonstrated negative static stability in the area in question.
Trimm the craft to neutral during the manoeuvre, which you are free to do, and you would be exactly in that situation. Therfore it's a
minimum gradient requirement. You can disregard the (push or pull) offset.
Originally Posted by
yoko1
MCAS exists because of requirement for a linear control feel
See above. No linearity requested but a minimum gradient. Nothing to do with linearity but with monotonicity.