To me this reads like SAC is pointing the finger at the operators by placing the onus on them via non-implementation of the AMM. Why would SAC not compare the historical Blackhawk steel stud performance to the S92 titanium studs and immediately realize that there was a material issue as part of their risk analysis process?
I still say that SAC is at fault here for being grossly negligent, JMHO.
Of course they are, but the blame also must lie with the FAA, and TC for that matter. The a/c was certified under the "extremely remote" clause, when that was proven false with the Broome incident the certification should have been pulled.
Why is the a/c still flying today when it clearly does not meet the certification requirements?