Originally Posted by RR_NDB
We could pinpoint the moment the AS started to change in respect to "ground speed" (supposing AS sensors LYING and presenting the "identical" info.) BEA is doing all necessary correlations.
That would be the moment the aircraft instruments are turned on. Air moves independently (more or less) of the ground below. Planes go through fronts. The trick is to isolate a set of "signatures" for pitots freezing up. Then you pray that set is exhaustive while knowing in your heart it's not even close.