As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
POST FLIGHT INSPECTION DISCOVERED THERE WAS 1EA 2ND STAGE PT ROTOR BLADE SEPARATED FROM THE MIDDLE SPAN OF BLADE. THE PILOTS REPORTED EVERYTHING WAS NORMAL DURING THE FLIGHT. INVESTIGATION REVEALED BLADE FRACTURED BY FATIGUE. MFG RECOMMENDS THE SDR BE CLOSED ON THE BASIS OF THE FOLLOWING INFORMATION.