Abnormal alternate discussion is somewhat irrelevant in the context of "no autotrim", since by the time AOA exceeds threshold the THS is already almost maximum nose up.
Had abnormal law engaged
and the crew had gotten a clue and pushed, it would only have hindered them in recovery - the THS would not have come back down unless they moved it manually, and the plane probably wouldn't tell them that. Queue another Bournemouth or Perpignan depending on luck - and probably a bunch of people here complaining about why auto trim was turned off in the stall.
If anyone doubts that ADR fail may prevent abnormal law triggering, just look through the reports of sim sessions on these threads, with some saying autotrim stayed in and others that they had to manually trim to recover. The difference is abnormal law, triggered or not depending which ADRs failed when.
@jcjeant
Seems Mr Rogers' Airbus technical experience is unstated...
Without knowing if it is one-AOA, median AOA, all AOA etc. that has to pass 30deg trigger we are looking at well after 2.11:33 and nearer 2.11:45 to be certain. Comparing with the FD trace it's too close to call given the graph resolution, however also need to take into account that there may be monitoring windows to eliminate transients and where we see AOA exceed 30 may be just the start of the window, which may be only 0.5sec (say), but by the end of which the FDRs are off.
Mr Rogers is even more confused than this though, saying both "need for 3 ADR that this law works" and "FD are in operation and therefore at least two ADR". Last I checked, "at least two" is not necessarily "three", and therefore proves nothing.
@Lyman
Has it at any time been attempted to hold the trim wheel to prevent Autotrim?
Have line pilots ever done this? In addition to quick sticking to prevent the THS from Trimming? Could something have gotten stuck in one of the wheels? Was anyone sitting or resting a foot on the pedestal?
yes it has, consequences already noted in other recent posts - fault messages and control law changes that would have shown in FDR.
I have given up on trying to understand alternate law. Quantum Physics is intuitive by comparison....
Only
probably (or maybe possibly) intuitive by comparison...
