Originally Posted by
sensor_validation
Are they suggesting a possible explanation is that the displays were not showing the same information as that recorded?
Not really, but "sort of". I read this as a criticism of the fact that only the LHS instrument displays were recorded, which means that the PF's side (RHS) was not. I think this is the BEA saying that it's impossible to know what the PF was actually seeing, and they don't like having to take it as read that he was seeing the same as the PNF, whose instrument displays were recorded. This doesn't alter the fact that the PNF was supposed to be monitoring his instruments, and both pilots should have been checking for discrepancies the moment the ASI data became unreliable.