Service difficulty report · Damper · Agusta AW119MKII

Difficulty date
June 14, 2018
Submitted
June 15, 2018
Operation
Air carrier
Aircraft
N355LL
Make and model
Agusta AW119MKII
Aircraft serial
14823
Aircraft time
2,093 hours, 5,568 cycles
Part
Damper
Part number
109011205107
Part serial
M020400423
Condition
Cracked
Location
Main Rotor
Part time
2,740 hours
Stage of operation
IN
How discovered
9
Nature of condition
O
Precautionary procedure
K

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

DURING INSPECTION, FOUND THE MAIN ROTOR DAMPER ON THE YELLOW BLADE WAS CRACKED ALONG INBOARD MOUNTING FLANGE, COMPLETELY THROUGH THE UPPER FORK AND STARTING ON ONE END OF LOWER FORK. FOUND METAL FLAKES AROUND UPPER FORK. AFTER REMOVAL OF THE DAMPER, THE UPPER FORK SEPARATED AT THE CRACK. THE L BRACKET CONNECTING THE BONDING STRAP APPEARS TO HAVE ROTATED, MARRING THE UPPER FORK. THE CRACK RUNS THROUGH THE UPPER FORK RIGHT ALONG BEARING INSERT.

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