Service difficulty report · Bolt · Bolkms BK117C2

Difficulty date
February 26, 2013
Submitted
February 26, 2013
Operation
General aviation
Aircraft
N186LA
Make and model
Bolkms BK117C2
Aircraft serial
9185
Aircraft time
1,882 hours
Engine
Tmeca ARRIEL1E2
Part
Bolt
Part number
B621M1061202
Part serial
274727412768
Condition
Cracked
Location
Main Rotor
Part time
1,882 hours
Stage of operation
IN
How discovered
D
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 A 100HR ANNUAL INSPECTION, IT WAS NOTED ON THE VEMD THAT THERE WERE MAST MOMENT EXCEEDANCES TRAPPED. DURING A DIE PENETRANT INSPECTION OF THE SECONDARY BOLTS 3 OF 4 INSTALLED SECONDARY BOLTS HAD CRACKING IN THE THREADED PORTION OF THE BOLT.