RWA:
In particular, we more or less 'know' that the pilots didn't have any sort of 'natural horizon' to work with. And it's only too possible that, at times anyway, they didn't have an artificial one either........?
Agree.
This message is part of the 24 CMC messages delivered by the aircraft at time of accident:
02:13:14 - .1/FLR/FR0906010211 34123406IR2 1,EFCS1X,IR1,IR3,,,,ADIRU2 (1FP2),HARD
Not explained on the 1st BEA interim report and certainly not completely explained on the second one.