What was found
PROPELLER, S/N HL255, WAS RETURNED FOR SB 5 AND SB 14 COMPLIANCE. AFTER DISASSEMBLY, INSPECTION REVEALED 1 BROKEN A-3204-1 PRELOAD SET SCREW. THE SCREW WAS BROKEN INTO TWO PIECES WITH THE B-3368 LOCKNUT STILL ATTACHED TO THE SCREW. DAMAGE TO THE C-6066-1 PRELOAD PLATE THREADS WAS BEYOND MANUAL LIMITS. THE PRELOAD PLATE AND SET SCREW WERE RETIRED FROM SERVICE.