# SDR 2013FA0000127

- Type: Service difficulty report (as reported; unverified)
- 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
- System (JASC): [6220 · Main Rotor Head](https://openairdocs.org/jasc/6220)
- 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
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2013FA0000127

## Discrepancy

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.

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