# SDR QR9R20201215002

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 15, 2020
- Submitted: December 15, 2020
- Operation: General aviation
- Filed by: [M1 Support Services, repair station QR9R369D](https://openairdocs.org/faa-repair-station/QR9R369D/m1-support-services.md) (OpenAirDocs)
- Make and model: Bolkms BK117C2
- Aircraft serial: 1572378
- System (JASC): [6220 · Main Rotor Head](https://openairdocs.org/jasc/6220)
- Part: Washer
- Part number: 1051310417
- Condition: Cracked
- Location: M/R Head
- Stage of operation: IN
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/QR9R20201215002

## Discrepancy

DURING M/R HEAD REMOVAL, MAINTENANCE FOUND 6 OUT OF 12 M/R HEAD MOUNT SPECIAL WASHERS CRACKED ON INNER RADIUS.

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