Zalt, very good digging...
All companies must rely on history to make design assumptions, S-92A no different, utilizing some very proven capability of the H-60. Of course, H-60 fatigue methodology exceeded commercial standards at the time.
You actually support the argument I am making. The Newfoundland tragedy was preventable on many levels, nuff said. What was done about it is a testament to the point about learning. The short solution was shown to be good enough, but further improvements were then made too, after re-evaluation of some of the assumptions.
To be clear, not bashing here.. it is a discussion about best industry practices, and always looking to improve.