Originally Posted by
Dave Therhino
The column cutout switch operates just as it does on the 737NG, stopping opposite automatic trim movement if the column is more than a certain amount away from the neutral position, EXCEPT when the MCAS activation command occurs.
...precisely when the column cutout switches are needed the most.
Originally Posted by
Dave Therhino
MCAS activation causes temporary bypass of the column cutout switch via an added relay.
From my...limited...understanding of the wiring diagram, it uses the same relay as the STAB TRIM OVRD switch, being an easy back door into the trim system.