# SDR QR9R202402130002

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 13, 2024
- Submitted: February 13, 2024
- 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: 09721179337
- Aircraft time: 3,933 hours
- System (JASC): [6700 · Rotorcraft Flight Control](https://openairdocs.org/jasc/6700)
- Part: Motor
- Part number: 41800879001
- Part serial: 697
- Condition: Failed
- Location: Yaw Trim
- Stage of operation: TX
- How discovered: V
- Nature of condition: F
- Precautionary procedure: C
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/QR9R202402130002

## Discrepancy

AP TEST FAIL DURING RUN-UP. SUBSEQUENT TROUBLESHOOTING REVEALED DURING AP GROUND TEST WITH AND WITHOUT HYDRAULICS APPLIED, YAW TRIM FAILED IN AP 1 AND AP 2. REMOVED AND REPLACED YAW TRIM MOTOR IAW AMM 67-14-00, 4-1.

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