Originally Posted by
jagema
I wonder why MCAS is the only system in the aircraft that bypasses the Control Column Cutout Switches (and therefore the STAB OVRD switch). Normally a pilot pulling back on the control column couldn't trim nose down even if he tried. And vice-versa for push-down. However MCAS can freely trim down even if pilot is pulling back.
Not quite correct, the Speed Trim System (STS) will trim in opposition to control column movement. B737 pilots get used to seeing the
trim wheel move without a trim input and accept this as normal. I believe this is a very subtle form of conditioning and normalization that is likely to be relevant to at least the Lionair JT610 accident.