Thanks for the correction Tinkicker.
Not all the accidents are obviously the result of unrecorded hours but I was thinking of the Sydney acccident when I wrote that.
So, it emphasises that this is a major issue that continues to reappear every 6 months or less. I think it is an issue that more pilots need to hear about. I worked for a major Robinson dealer in Canada recently and never heard a word about this problem.
A 700hrs blade is not even half life.