What was found
PILOT REPORTED A ONE-TO-ONE VIBRATION. WHILE WORKING ON THE ROTOR VIBRATION, THE FRAHM DAMPER WAS FOUND DAMAGED. UPON REMOVING MAIN ROTOR COVER ASSEMBLY, NOTED ITEM 32 (LINER ASSEMBLY) HAD EXCESSIVE CONTACT WITH ITEM 17 (PAD ASSEMBLY). LINER ASSEMBLY WAS BROKEN INTO NUMEROUS PIECES. PAD ASSEMBLY WAS ALSO EXCESSIVELY DAMAGED. THE UPPER FLANGES ON ITEM 18 (WEIGHT ASSEMBLY) CONTACTED THE RADIUS AREA OF ITEM 34 (HOUSING ASSEMBLY) TO A POINT WHICH CAUSED THE HOUSING ASSEMBLY TO BE GOUGED AND CRACKED IN THE RADIUS AREA.