# SDR QR9R2026073000002

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 30, 2026
- Submitted: July 30, 2026
- 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: 9752
- Aircraft time: 4,391 hours
- System (JASC): [6720 · Tail Rotor Control System](https://openairdocs.org/jasc/6720)
- Part: Actuator
- Part number: 41800876400
- Part serial: 710786
- Condition: Faulty
- Location: Autopilot
- 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/QR9R2026073000002

## Discrepancy

DURING RUN-UP, YAW SAS AND BACKUP SAS CAUTIONS WOULD NOT GO OUT. DURING TROUBLESHOOTING, SHOT RESISTANCE BETWEEN PINS B AND C OF YAW SEMA AND FOUND THAT IT WAS BAD. ON AFCS BANNER UPON POWERING UP AP1 AND AP2, YAWEMA INVALID WAS PRESENT. REMOVED AND REPLACED SEMA ACTUATOR IAW AMM 67-20-00, 4-14.

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