As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING ASSY OF A PROPELLER, THE JAM-NUTS, PN B-3368 WERE INSTALLED AND THE BETA RING RUN-OUT TOLERANCE COULD NOT BE MAINTAINED. FURTHER TROUBLESHOOTING IDENTIFIED THAT THE NUT PN B-3368 WAS MFG WITH THE THREADS NOT TRUE. CAUSING THE RUN-OUT TO BECOME EXCESSIVE WHEN THE NUT WAS TIGHTENED.