Historical Info
What is heartbreaking all the way around is the mode of failure. One moment all is fine, and the next the speed is unknown/unavailable/kaput. There was no opportunity to take note of the situation immediately prior to failure. Had the PF had his eye on speed at the time of pitot icing, he would have known the stall warning was spurius. Is that true?
Would it help to have a display of a minute or two of historical data, something like an FDR trace on a display with a few parameters such as speed, altitude, AoA available for a situation like AF447? It would have been immediately obvious that the speed was fine 5 seconds ago. Maybe there is a way to display this information in a more helpful way. Or, would that just contribute to the confusion?