Originally Posted by
737 Driver
The description cited above is not an official Boeing source. I have seen not any system description from Boeing that states that MCAS will ever input nose up trim. In this way, it is not unlike what the Speed Trim System does approaching a stall when the flaps are extended.
Correct, but there are multiple credible sources saying effectively the same thing. It was in point (1) of FCEng84's long clarification post earlier in thread:
link
FCEng84 has posted good, readable, and apparently accurate information on MCAS from the start, I haven't had reason to dispute any of the other information so I would tend to trust this part too.