# SDR YV3R2019082920168

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 22, 2019
- Submitted: August 29, 2019
- Operation: General aviation
- Aircraft: [N557SM](https://openairdocs.org/aircraft/N557SM), registered now
- Make and model: Robsin R44RAVENII
- Aircraft serial: 11700
- Engine: Lyc IO540AE1A5
- System (JASC): [6240 · Main Rotor Indicating System](https://openairdocs.org/jasc/6240)
- Part: Tachometer
- Part number: C7924
- Part serial: 3273
- Condition: Failed
- Location: Dual
- Stage of operation: CR
- How discovered: O
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/YV3R2019082920168

## Discrepancy

CUSTOMER REPORTED DUAL TACHOMETER FAILED DURING FIRST TRACK AND BALANCE FLIGHT.

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