Originally Posted by
yoko1
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.
If MCAS will still have a maximum 9 second run time and a pilot should cut it in 3 seconds - what is the other 6 seconds of MCAS operation still required for?
The pilot will not like where it is going, as it is in an unfamiliar part of the flight envelope that it operates. So the pilot should cut MCAS when it is needed?