As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) ONE OF THE 6 BOLTS ATTACHING THE PROPELLER TO THE ENGINE CRANK SHAFT FLANGE BROKE AT THE TOP OF THE THREADED AERA ON INITIAL TORQUE.THE PROPELLER HAD A PLACARD INDICATING TORQUE SPED FOR 1/2" BOLTS. PROLLER IS ATTACHED WITH 7/16" BOLTS. IT IS SUSPECTED THAT THE BOLTS HAVE BEEN OVER TORQUED ON PREVIOUS INSTALLATIONS. PLACARD WAS REMOVED FROM THE PROPELLER AND BOLTS TORQUED TO THE PROPER TORQUE SPEC FOR 7/16 BOLTS.