twistedenginestarter,
There are several BEA reports to read:
The first BEA Interim report you can find here:
http://www.bea.aero/docspa/2009/f-cp...90601e1.en.pdf
It speaks of pitot tubes and gives the information on how they function and how they are connected to the flight system.
The second BEA Interim report you can find here:
http://www.bea.aero/docspa/2009/f-cp...90601e2.en.pdf
This report gets deeper into the pitot tubes. It discusses how they are certified and examines the experiences of pitot tube icing and observed differences of icing between pitot tubes manufactured by Thales and those manufactured by Goodrich on Airbus aircraft. Refer to Appendix 7 for a listing of events. I think the BEA is very suspicious of pitot tube icing at the time of this report as Thales pitot tubes were the installed on AF447, which were to be replaced by a EASA AD, but were not yet changed out on AF447.
The most recent BEA report is an Investigation Update you can find here:
http://www.bea.aero/fr/enquetes/vol....mai2011.en.pdf
It makes no mention of the pitot tubes, but gives some information from the FDR and CVR regarding the last moments of the flight.
Hope this helps your understanding.