# SDR QR9R2026091100002

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 11, 2026
- Submitted: September 11, 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: 9334
- Aircraft time: 5,282 hours
- System (JASC): [7600 · Engine Controls](https://openairdocs.org/jasc/7600)
- Part: Control Box
- Part number: B761M5023103
- Part serial: 409
- Condition: Faulty
- Location: Vartoms
- 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/QR9R2026091100002

## Discrepancy

ROTOR RPM REMAINED IN LOW RED RANGE (95%) IN FLIGHT. LOW ROTOR RPM LIGHT AND HORN CAME ON INTERMITTENTLY. REMOVED AND REPLACED VARTOMS CONTROL BOX IAW AMM 76-13-00, 4-1. FUNCTIONAL CHECK COMPLETED OK.

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