Originally Posted by
silverstrata
Edit: As to Zzuf’s question about why not fit a stick-pusher instead, I suspect this was a certification issue. If Boeing had admitted a stick-push was required, then a lot more certification would also have been required. But if you slip in a trim-pusher by the back door, then perhaps nobody will notice....
That is not a question I asked.
Stick pushers are only fitted when the actual stall characteristics are non-compliant, not for stability issues approaching the stall.
Years ago, instability approaching the stall was acceptable provided a pronounced nose down pitch occurred at the stall.
Some regulatory authorities didn't much like the thought of self stalling aircraft (due lack of longitudinal static stability) so the stability requirements approaching the stall were tightened up, and stick nudgers came into being for those aircraft which couldn't comply.
Not heard any issues about the 737 MAX stall characteristics which would mandate fitting a stick pusher.
Pushing stuff through the "back door" is not how certification works. How do you think the FAA and other regulatory authority test pilots would react when presented with such non-compliances?