Though Aseir points out not all the A models lead to a B model, sadly someone has to fly the A model for any progress.
hilife: I agree with your point that helicopter flying is not a zero risk activity, but it is not reasonable to expect a high standard of design & manufacturing? Chaffing pipes may not be a new problem, but thats all the more reason not to have them with a new design surely? Is it not reasonable to actually get some improvement on the previous generation of aircraft?
If a 737 takes off every 5 seconds, the PHI reaching 10.000 hours with the S92 is harldy a conclusive track record.