As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) PROPELLER, OR OTHER, VIBRATION PRONOUNCED AT LOW ALTITUDE AND HIGH SPEED. PROPELLER WAS REPLACED DUE TO BLADES HAVING EXCESSIVE PLAY ABOUT ITS TURNING AXIS. UPON DISASSEMBLY OF THE PROPELLER, BEARING WEAR WAS NOTED ON THE BLADE ACTUATING LINKS. THE PROPELLER HAS BEEN RETURNED TO THE MANUFACTURER FOR INVESTIGATION OF PREMATURE LINK BEARING WEAR.