@ Copterline 103: I think each of those S76 accidents mentioned were unique of themselves. Except for 3 February which we only have to speculate on, but fair chance I reckon it will be unique of itself also.
If a MR blade comes off in flight, dual servo actuator failure, flight control rod coming undone, all those things will result in the loss of the aircraft. Each of which has only happened once in the whole fleet since it first went into service over 35 years ago (as far as I know). Unfortunately for the crews concerned it happened to them, and there was nothing they could do to prevent the outcome.
Not just the S76. AW139 has had tail booms fall off, and TR blades depart the scene in-flight. It can happen to any aircraft. Sometimes bad luck strikes, when crossing the road, flying helicopters, and anything else we might do in life.