Mr selfish,
Try the ATSB site at the link below this may give you a few answers regarding the most recent R22 blade separation.
Sadly the cause would never have been discovered before the accident..... Internal corrosion, would never have been found with regular maintenance inspections.
I guess the ball is back in Frank Robinsons court.
http://www.atsb.gov.au/aviation/rec/...ail.cfm?ID=423
AU Ppruners please look at the Fraser Shannon Benefit thread and do your bit to help his wife and kids.