Originally Posted by
Station Zero
I have been thinking further about what possibly caused the increase forces, as aerodynamic forces should not really be felt even on a 737 through the column unless the hyds are off, so could the Elevator Feel Shift that occurs when a stall is detected (I believe based on AOA input to the SMYD) be the cause of the increase of column forces, as this applies forces to the feel and centering unit to resist elevator up movement which could have effectively compounded the situation.
The way I read the diagrams, each SMYD feeds one side stick shaker motor, but same signal from
either SMYD will trigger EFSM. So the expectation would be that if stick shaker is going off, even on only one side, EFSM will also kick in, and yes that would mean increase in column forces.