Sometimes I wonder if we're all reading the same report...
Originally Posted by
bearfoil
Ten degrees nose UP? That tells us nothing about the AoA, or the position of the THS. Was it already at 13.2? Did pilot cease his initial NU and begin his repeated ND inputs? The 7000fpm suggests the climb was (initially) very rapid, and there is no reason to think the THS was not "UP" having corrected for a chronic descent?
I doubt THS could get to 13 nose up in normal law without triggering protections. Unless AoA was busted (as at Perpignan) - but there is no indication given of that.
Even if it did, how didi it then get back down to 3deg (during climb and nose-up inputs) in order to rise from 3 to 13deg later in the time line ?
BEA clearly state pitch increased progressively at start of climb, 7000fpm was the rate reached at the
end of the first climb, at the point PF
started nose-down inputs.
Turbulence? There is nothing in this sequence (sic) to base a conclusion of PF
chronic NU. BEA say ".......A INPUT....."
and indeed they don't specify a duration, however the next mention of inputs is nose down after the (first) climb.
During that first climb PF gets stall warning. At 37500ft he gets stall warning again and "maintains" NU input in response. If the response to the SW is consistent, then the conclusion is chronic PF NU.
If the descent was transient, and chronic, why shouldn't the THS react with 13 degrees nose up?
What descent ? You either mean transient
or chronic, or, with respect, you don't know what you mean. It can't be both. If it was transient, there would be insufficient time for THS to move, if it was chronic (and significant rate), there would be a noticeable altitude loss before a/p drops out.
Why did the Pilots not MAN TRIM ND? First of all, they were trained not to, and secondly, How were they to know the THS was at 13.2 degrees NU or at the limit.
So they were trained not only not to touch the trim wheel, but also that if they concentrated hard enough, it would actually disappear ?
To me, some of the scariest comments on these threads have been on training practices. Was PFs only training for stall warning "pull up" (to minimize alt loss) ? That is all it would take.