SASless
The 64 Dollar Question is what is the minimum tolerable level?
Good question.
Part 29 calls for catestrophic transmission failure modes to be identified and reduced as far as technically feasible and economicaly justifiable.
If changing the studs to steel is an adequate fix as Sikorsky claim, the 64 (k or million) Dollar Question seems to have a 64 cent answer -
it wasn't.