# SDR QR9R2026081100001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 11, 2026
- Submitted: August 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: 9819
- Aircraft time: 3,714 hours
- System (JASC): [7714 · Engine RPM Indicating System](https://openairdocs.org/jasc/7714)
- Part: Sensor
- Part number: 9580115910
- Condition: Failed
- 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/QR9R2026081100001

## Discrepancy

OVSP SYSTEM 1 FAILED DURING START RUN-UP. MAINTENANCE ARRIVED AND PULLED CB AND CAUTION LIGHT WAS STILL ILLUMINATED AFTER RESETTING CB. DURING TROUBLESHOOTING, FOUND #1 ENGINE OVERSPEED SENSOR BAD. PINS 1-2 OP AND PINS 4-5 HIGH RESISTANCE. REMOVED AND REPLACED #1 OVERSPEED SENSOR IAW 77-14-00-900-802-A01.

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