As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) THE PROP WAS INSTALLED ON THE RT SIDE OF ACFT. WE RECEIVED NOTICE FROM MFG TECH SUPPORT THAT THIS PROP MAY HAVE A BLADE COLLAR INSTALLATION ISSUE. UPON CLOSER INSPECTION, THE NR 1 BLADE COLLAR WAS MISSING. WE SUSPECT IT FELL OFF DURING ENGINE OPERATION. THE PROP WAS REMOVED AND SENT TO AN O/H FACILITY FOR CLOSER INSPECTION AND REPAIR OF THE REMAINING BLADE COLLARS. AN INSPECTION WAS CARRIED OUT ON THE AFFECTED ENGINE.