Very much appreciate your view Bolty. Thanks for rejoining the thread.
Note: A new thread has been started in the Tech Log about the CF6-45/50 URGENT subject.
The relation to the T972 failure is:
HARMONIC EXCITATION LEADING TO UNCONTAINED ENGINE FAILURE.
This is the math used
http://www.aerostudents.com/files/vi...Excitation.pdf
My guess is that RR and Schaeffer were not communicating effectively while these numbers were entered into the design specs.
There was one or many breaks in communication within or without RR during the design process. This would suggest that the design itself is inherently flawed OR that the manufacturing process cannot be configured to reproduce the design specifications.
Only one way this can happen: non communication or incompetent management.