cause
"That’s even worse Lyman, under Normal Law, the system logically thinks it’s time to cancel autotrim by reaching Alpha Prot or slightly above, but when the situation has degraded and Alternate Law is active, the system thinks it’s smart to autotrim all the way whatever the Alpha …" CONFiture.
And to me, the sequence of events should be seen in its logical context... Once climbing, the THS stopped trimming @ ~3 degrees. That would indicate that NORMAL Law obtained...(overspeed react, a/c?)
At 2:10:22 "....ALTERNATE LAW..." PNF
Once slowed, with AoA increasing, the THS re-invigorated, then the a/c STALLED.
By the evidence, and knowing the controls LAW profile, one could conclude that the a/c was reacting to an actual overspeed at 2:10:07. The STALLWARN could have been triggered by an A0A at or above STALLWARN trigger (bug).
Once slowed by ( 'elevators only' climb, ) the a/c switched to ALTERNATE2 and the THS started cranking again....
Other than ruffling feathers, I have not seen that this could not be so.
In the case of controls LAW, the evidence points to overspeed followed by Law degrade, then STALL, with an active THS.
Not knowing the length of time the a/c takes to suss/WARN Overspeed, or ALTERNATE LAW, it is conceivable the direction and fortitude of the airmass, plus controls input (to include THS), could easily cause: climb/upset/STALL......
In any case, the aircraft seems to be telling us that @ Alpha Prot (STALLWARN) the THS is stopped. And that once degraded into Alternate2 in the climb, the THS starts trimming UP once again.
As above....
Last edited by Lyman; 12th May 2012 at 15:14.