Machinbird posted
Why couldn't the ADR problems be a result of a departure from controlled flight?
Everything is possible but you will need a root cause for upset, for which there is no proof nor evidence. That is a gratuitous hypothesis, not Occam compliant at all.
Shoot down the concept of the entire ACARS sequence being caused by a departure at the beginning if you can, but do it with data.
Both FPVs got flagged early in the sequence, and that means both guys at the front just switched their FPVs on and found them flagged. FPV is pretty useless in an upset and is definitely not the first thing you will do then. Beginning of sequence is stable flight, only condition when FPV is useful.
FMGEC1 gets faulted by AFS late in the sequence, and that means AFS is active. Which means it got reengaged, because it dropped early in the sequence due to UAS. This again says 'stable flight'. Flight was stable until this fault at least.
Last but not least, the whole ADR clusterphukk is due to Probe-Pitot faults early in the sequence. There is enough evidence of these particular probes icing in cruise to make this a reasonable root cause. Of course, there is something else to turn a manageable UAS into a crash from FL350.
By differentiating these faults specific to our mystery from those where no crash occurred, one will have a clue as to this additionnal problem. May I humbly suggest this : WRG : ADIRU1 BUS ADR1-2 TO FCPC2, HARD. Yes, hard indeed...