# SDR 2023FA0000433

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 18, 2023
- Submitted: August 18, 2023
- Operation: General aviation
- Aircraft: [N421MQ](https://openairdocs.org/aircraft/N421MQ), registered now
- Make and model: Diamon DA 42 NG
- Registry model: [Diamon DA 42 NG](https://openairdocs.org/model/diamond-aircraft-ind-da-42-ng) (OpenAirDocs)
- Aircraft serial: 42439
- Aircraft time: 230 hours
- Engine: Austro E4
- Engine time: 230 hours
- System (JASC): [7240 · Turbine Engine Combustion Section](https://openairdocs.org/jasc/7240)
- Part: Engine
- Part number: E4C
- Part serial: E4C06098
- Condition: Mismanufactured
- Location: Engine
- Part time: 230 hours
- Stage of operation: CL
- How discovered: O
- Nature of condition: E, R, O
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2023FA0000433

## Discrepancy

ENGINE ROUGHNESS ON TAKE OFF, RPM FLUCTUATIONS, BLACK SMOKE COMING FROM EXHAUST, VIBRATIONS, AND LOUD BACKFIRING.

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