Hamburt Spinkleman;
There are reasonable things upon which informed, experienced and knowledgeable speculation or assumptions may be made. This accident is no different and many very good people who have engineering, mathematical, flight safety and airline operational and piloting experience have contributed freely and added to understanding. This includes a number of pilots who have flown this aircraft, some under similar weather conditions and who know this environment.
Along the way through these eight, possibly nine threads some exceptional thinking has been offered which has helped others who are less familiar with these aircraft and these operations but who nevertheless suspend judgement and comment, in favour of an abiding curiosity and thirst for knowing how others do this work.
In keeping with discussing what may be reasonably known regarding the displays available to the crew, post-event and so as to avoid leaving false impressions for others who are also reading here and studying this accident, that there was no flight information available to the crew other than the deck angle and the seat of their pants, the displays and all information provided by the two PFDs and NDs were almost certainly available with the exception of the airspeed and that only for a period of under thirty seconds.
The IRUs, DMC's and at least two FCPC's and the FCSC's were functioning, the aircraft was fully-powered, all the data needed for controlled flight was available and no primary system losses such hydraulics, engines or engine controls had failed.
A loss of airspeed data does not result in the loss of displays and there are no data indications, ECAM or ACARS messages indicating such a loss nor are there any indicated associated failures which would cause any or all screens to go dark.
Thus, attitude information (pitch & roll), IVSI, altitude and heading information were all available. On the Systems Pages all information would be available including flight control positions. The ISIS, a somewhat independent attitude, speed & altitude (but not VSI) system was also available except for speed for a short while.
In the thirty-six other similar loss-of-CAS events no screens were blanked nor was other information normally provided on the two PFDs and NDs lost to the crew.