Originally Posted by
Maninthebar
MCAS trims at a greater rate than electric (yoke switch) trim.
How many seconds of electric trim would be required to counterract 9.2 seconds of MCAS?
Are there any other circumstances under which you would expect to have to trim continuously for that length of time (or more if more than one MCAS activity had run undetected)?
The short answer is there is no earthly reason to let the trim run that long without doing something about it - that is why it is called Runaway Stab Trim. Keep in mind that the expected pilot reaction time to Runaway Trim was 3 seconds. Now even I think that’s a bit tight, but 9 seconds is three times as long. If the pilot doesn’t like where the trim is, or where the trim is going, the solution is literally right under his/her thumb.