Indeed, where DO you draw the line? I'm a pilot, not an engineer. But I want it beyond a reasonable doubt that my machine is safe to fly. And when in doubt, I chicken out. It's valid for weather, crew and for the machine.
I'm a bit confused about the issue of when to ground a type, but if it's a main blade spar, it seems generic enough for me.
Without casting undue critisism on authorities and people, I'd like to learn more about the mechanisms of the grounding of A/C and mandatory inspections. I remember mandatory rotor mast inspections every x hours just a few years back, because of a non-fatal accident. So what's the rule?
Perhaps Nick Lappos can comment on this particular case as a Sikorsky man?