Is it reasonable to assume that the overall load through the 225 gearbox and different harmonics (5 blade head etc) produce a different type of fatigue/vibration pattern and therefore a greater chance of failure?
It doesn't alter the fact that this aircraft has flown for 7/8 years, nearly 100,000 fleet hours, without a single aircraft induced accident, and then suddenly 2 in 5 months - With the same cause.
Something must have changed??