As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(AUS) FOLLOWING PILOT REPORTS OF PROPELLER VIBRATION, AN ULTRASONIC EXAMINATION WAS CARRIED OUT ON THE PROPELLER HUB. ONE CRACK LIKEDEFECT WAS DETECTED ADJACENT TO A THREADED INSERT HOLE. THE CRACK WAS LOCATED AT A DEPTH OF 13MM (0.512IN) AND HAD A LENGTH OFAPPROXIMATELY 13MM (0.512IN).