td:
That's fascinating. Because the blade separation is due to static overload, it requires a higher flight load to do so. So even though takeoff and climb represents a pretty small portion of the overall flight spectrum, the much larger time spent in the remaining portions of flight is not enough to allow the crack to propagate further and fail at a cruise flight load. It almost seems like that's been borne out in some of the incidents I remember, is it an industry wide trend? Sounds indeed like it could be used to support ETOPS certification.
Your explanation of the quantitative risk assessment is right on.
