Listen Berenger,
Don't get me started!
I was at the memorial service today, the widow was there as well. This terrible event is incomprehensible and unjustifiable!
With TCAS, ATCOs' instructions can't be a last resort tool!
We don't know if a crew follows RAs, unless we're told!
As soon as we are told, we're out of the picture, until separation has been reestablished.
It can't be that in some parts of the world, pilots have to follow TCAS, and in other parts, they have to follow ATC instructions.
The 757 descended according to the RA. The controller wasn't told until after 25 secs. Within those 25 secs he told the TU154 to descend, he was in charge of providing separation. His decision was, to clear the TU for descend. Had he known that the 757 was descending according to RA, he would have acted differently. Therefore I reiterate: Follow TCAS no matter what AND TELL US!