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The Beeb are reporting that investigators have said that the aircraft was intact when it hit the roof. They are not looking for bits and pieces in the local area.
That shortens the odds of the drive train being at the root of the cause. MRGB seize? TRDS fail? Fenestron Fail?
If that's the case then the pilot would have found himself driving an unmanageable brick.
We practice TRDS fail at low speed/height in the sim and it is no fun, no fun at all.