What was found
PROPELLER S/N HL234 WAS RETURNED FOR FAILURE TO DYNAMIC BALANCE. AFTER DISASSEMBLY, INSPECTION REVEALED 1 BROKEN A-3204-1 PRELOAD SET SCREW. THE B-3368 LOCKNUT WAS STILL ATTACHED TO THE INBOARD SECTION OF THE A-3204-1 SCREW. THE SCREW WAS REMOVED, SENT TO HARTZELL ENGINEERING FOR EVAULUATION AND REPLACED WITH NEW. THE C-6066-1 PRELOAD PLATE THREAD WAS DAMAGED, BUT WITHIN ACCEPTABLE LIMITS AND THE PLATE WAS REPAIRED AND RETURNED TO SERVICE.