# SDR 2022FA0000775

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 27, 2022
- Submitted: December 27, 2022
- Operation: General aviation
- Aircraft: [N140SF](https://openairdocs.org/aircraft/N140SF), registered now
- Make and model: Bolkms BK117C2
- Aircraft serial: 9389
- Aircraft time: 6,511 hours
- System (JASC): [7700 · Engine Indicating System](https://openairdocs.org/jasc/7700)
- Part: Tachometer
- Part number: B771M40C1003
- Part serial: 00544
- Condition: Failed
- Stage of operation: AA
- How discovered: C
- Nature of condition: G
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2022FA0000775

## Discrepancy

TRIPLE TACH WOULDN'T PASS SELF TEST ON START UP

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