# SDR QR9R2026051300001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 13, 2026
- Submitted: May 13, 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: 9701
- Aircraft time: 4,487 hours
- System (JASC): [7714 · Engine RPM Indicating System](https://openairdocs.org/jasc/7714)
- Part: Sensor
- Part number: 9580115900
- Condition: Out Of Tolerance
- Location: Eng Overspeed
- 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/QR9R2026051300001

## Discrepancy

ENG 1 OVERSPEED ON CAD. PULLING THE BREAKER MADE IT GO AWAY, PUTTING THE BREAKER BACK IN MADE IT COME BACK ON. WHEN GOING TO IDLE AND BACK TO FLIGHT IT GOES AWAY, COMES BACK ON AT A HOVER. DURING TROUBLESHOOTING, FOUND #1 ENGINE OVERSPEED SENSOR BAD, READS OUT OF TOLERANCE ON PINS 2-3. REMOVED AND REPLACED #1 ENG OVERSPEED SENSOR.

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