# SDR QR9R2022120800001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 8, 2022
- Submitted: December 8, 2022
- 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: 14723409713
- Aircraft time: 3,229 hours
- System (JASC): [7714 · Engine RPM Indicating System](https://openairdocs.org/jasc/7714)
- Part: Tachometer
- Part number: B771M40C1005
- Part serial: 401
- Condition: Faulty
- Stage of operation: TX
- How discovered: 9
- Nature of condition: F
- Precautionary procedure: D
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/QR9R2022120800001

## Discrepancy

ABORTED TAKE-OFF DUE TO ROTOR TACH FAILURE. ROTOR NEEDLE DID NOT MOVE ON FIRST ENGINE START. UPON TROUBLESHOOTING, NR SPEED SYSTEM FOUND TRIPLE TACH R NEEDLE FAILS TO SELF-TEST, NEEDLE IS STUCK. REPLACED TRIPLE TACH INDICATOR IAW AMM 62-41-00, 4-2. MOC SUCCESSFULLY COMPLETED.

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