Originally Posted by IF789
I don't think stopping autotrim would have affected this accident. I know you've argued that had the nose gone down they'd have diagnosed the stall, but I'm not so sure. When the a/c did pitch down in stall what was the reaction ? Pull-up, hard. If you're already prepared and briefed for stall in the sim, the nose drop is going to be obvious, but if you think the a/c isn't responding right (which looks like an issue in roll at least even before the stall) and you're pulling back and the a/c suddenly drops the nose, what will you do ?
To trim up in such circumstance must be a pilot's call, not one for the automation.
Let the crew make such a deadly mistake,
don't do it for him please.
Trim / AutoTrim: oh yes.
Now we would need to evaluate both item separately ...
But what is the typical problem with trim, what's its MO when it kills ? Looks to me like it's trim-up before stall, autos drop out, trim not managed by crew then contributing to the upset and/or preventing the recovery. Exactly the opposite of 447 - which looks like the odd one out.
Because trimming to the limit of the AP like in AMS or LGW is not a better idea - AP should give back control before reaching such extreme because autotrim itself should not be allowed to go that far.
I note that limits for the 320 electric trim and manual trim are different.
It is apparently not the case for the 330 ?