Originally Posted by
Lyman
Yes, and why did the THS not trim ND?
Because it was never commanded to - none of the inputs of the PF and PNF were ever sustained long enough to make a difference, with one exception. The PNF's input at 02:13:42 would probably have been enough to move the THS - however it's a moot point for two reasons:
- The aircraft was already too low by that point.
- The PF was still pulling up - hence the "DUAL INPUT" warning.
It spent 43 seconds 'parked' at three degrees NU. It did not trim NU as the climb began and continued.
Yes, because the elevators' authority was sufficient to meet the demand.
PF's commands were a combination of ND and NU, and some time was spent -1G. So it should have trimmed, what inhibited it?
I've said this more times than I care to think about, but because the ND command has to be *sustained*. In the A320 sim, from THS full-NU to return to neutral required full forward sidestick input for about 8 seconds. The PF never applied corrective inputs for anywhere near long enough.
I was asking bubbers44 what he thought.
For which you'll get an answer in line with his way of thinking - i.e. that the traditional control setup is the best way to do it.