What was found
PROPELLER, S/N HL247, WAS RETURNED FOR LOOSE BLADE. AFTER DISASSEMBLY, INSPECTION REVEALED 1 LOOSE A-3204-1 PRELOAD SET SCREW. THE SCREW WAS BACKED OUT APPROXIMATELY .50 INCH WITH THE B-3368 LOCKNUT STILL ATTACHED TO THE SCREW. ALSO, 2 BROKEN A-3204-1 SCREWS. THE SCREWS WERE BROKEN INTO TWO PIECES WITH THE B-3368 LOCKNUTS STILL ATTACHED TO THE INBOARD SECTIONS OF THE SCREWS. ALL PRELOAD PLATE COMPONENTS WERE REMOVED, SENT TO HARTZELL ENGINEERING FOR EVALUATION AND REPLACED WITH NEW.