The trimming device that put the aircraft sideways survived.
The aircraft has a Rudder Limiter Control Unit.
"Rudder with Care" appears on the PFD when the Rudder is over deflected, but not at speeds below 250 knots.
The RTLU was capable of preventing this crash, but the system was not designed to.
Not in this case....
Two problems:
1. Not addressing a potentially lethal problem whilst equipped with a device that is supposed to save itself.
2. Ignorance of fail safe structural design in this aero domain, eg, the Rudder fasten/join is too robustly built at loads approaching VS separation.
It is not difficult to determine what load should fail the VS, NTSB did. Somewhat short of this value, the Rudder hinges should fail.