Hi,
At cruise, you don't even need altitude for a while, "pitch, power and attitude" is the minimum required... with pilot experience and adequate training.
So .. we know the lack of speed indication (pitot tubes) was not the cause of AF447 loss
What can be the other causes ?
Seem's it's not a big range of choices ....
1-Structural destruction (due to weather circumstances) ?
2-A malfunction of aircraft systems ? (Exept pitots tubes of course)
3-Bad behavior of the pilots ?
Note:
I eliminate the point 1 of the list due of the state of the wreck and BEA preliminary reports