FCEng84: the MCAS descriptions I've seen state that 2.5 degrees is the maximum incremental change that will be commanded, with a 0.27 deg/sec movement. After each such increment, if the high-AoA condition persists, another incremental change is commanded. I didn't see any statement that manual trim "resets" the mcas. On the FDR plots, we see three trim elements: manual electric command, elevator trim position, and automatic command, which includes STS, MCAS and A/P. At some point on the previous flight, we see both command channels cease correlating to trim movement. That decoupling, rather than any lack of movement, was what I was pointing to.