# SDR QR9R20211210002

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 10, 2021
- Submitted: December 10, 2021
- 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: 07720099123
- Aircraft time: 2,958 hours
- System (JASC): [7714 · Engine RPM Indicating System](https://openairdocs.org/jasc/7714)
- Part: Indicator
- Part number: B771M40C1005
- Part serial: 00784
- Condition: Faulty
- Stage of operation: CR
- How discovered: V
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/QR9R20211210002

## Discrepancy

N2 INDICATIONS BOTH ENGINES ON TRIPLE TAC INOP / WENT TO ZERO IN FLIGHT. REPLACED TRIPLE INDICATOR RPM IAW AMM 62-41-00, 4-3. T/F COMPLETED IAW AMM 05-60-00, 6-12, CHECK FOUND GOOD.

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