A couple of points about the condition of the head hinges, if a flap hinge had more friction than the other, to the point where the many tones of centriphical tension couldnt break the binde, itd have to be sceezed compleatly. At worst, itd create a head shake that a pilot would notice an land asap. These hinges only need to move with G load ( coneing) changes, so itd only shake with a change in G load. If the central hinge sceezed and wouldnt allow the hub to rock, the teetering action would be transfered to the coneing (flap) hinges, again, only creating a stick shake.
If all 3 hinges bound, there would be a heavy left roll tendancy.
None of the above would cause the blades to suddenly and without warning, attack the machine.
In the list of incidents, the only pattern is that the blades suddenly, and without warning, violently depitch and mince the airframe.
Its been recorded to happen at any speed from hover to @90 kts, so AS can be rueled out.
Its happened with a wide range of AUWs, so disc loading can be rueled out.
Its happened, generaly at a steady cruise, but also dureing normal manouvers, but never recorded to happen with high rate, high magnitude control inputs ( mustering ops), so ham fisted pilots could almost be rueled out.
Low G roll is to the left. The incident reports list rotor strikes on every point of the compass, not consistant with low G strikes.
Probably millions of hours have accumulated in robbys, only 32 (?) have been recorded to self destruct with no indication as to why.
Sounds more like a rare structural failure, like maybe, phase lock.
Afterall, MR phase is only locked with two ball joints, loaded in shear, and not their intened design, tension.
Ready to stand as im corrected.