Originally Posted by
gums
How did the THS get trimmed to near the limit?
To me it seems there are two aspects to Auto Trim.
One is the normal behaviour of 1g Trim.
So the system tries to trim for 1g vertical acceleration.
This can theoretically only happen if the stick is neutral, because any Nose Up Stick Input means commanding > 1g.
Only when commandig 1g (i.e. Stick neutral) the system can know what the target FPV is where it is supposed to maintain 1g.
But that doesn't explain the 13° NU.
Somehow I've got a feeling it is a side effect due to the fact that after continuous NU the Aircraft started to stall and actually fell below 1g which the system tried to compensate by applying NU THS trim.
Somewhere there was a statement that the Autorim tries to support the elevator in case the latter alone is not able to achieve the requested attitude by the PF. I rather tend to think that the latter is a somewhat awkward description of what I mentioned in the preceding paragraph.