Barit1
But decades of experience says there are potentially other causes for shaft separation, and the fundamental issue is the lack of any provision in the Trent to destroy the runaway turbine airfoils prior to disc burst.
I doubt that the regulators will agree with that
Do any of the manufacturers altually demonstrate a shaft separation at takeoof conditions, or do they just point at some design feature that might have worked in the past?
As in all accidents there are lessons to be learned by all