jcjeant
I will repeat this X1000 if needed:
The Pitot tube was not faulty
As many here like write about the plane ...
The pitot tube operated normally .. as required by its specifications and certifications
The problem is that the measuring instrument has been used outside his operating range
Ice crystals is not a area for use Pitot tube .. it's not in the certifications
As the plane went well until he was out of its flight envelop
As the pilots went well .. until they were (or put their self) in a situation out of their skill
I believe that you are too quick to defend the pitot tube as not being at fault. The earlier poster had specifically stated "pitot system"
It was the speed measuring system at fault (the pitot was only a part of it). Of course you are correct that such a system fault was presumed at aircraft certification..
At this point the assumption is that a combination of systems or unlikely events probably caused the accident. The issue now is what needs to be fixed to prevent another accident.
It is not enough to change the pitot tube alone when clearly a system fault was not accomodated to continued safe flight and landing.