# SDR 99ZZZX4197

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 4, 1999
- Submitted: March 26, 2000
- Operation: General aviation
- Aircraft: [N644DD](https://openairdocs.org/aircraft/N644DD), registered now
- Make and model: Mooney M20J
- Registry model: [Mooney M20J](https://openairdocs.org/model/mooney-m20j) (OpenAirDocs)
- Aircraft serial: 240664
- System (JASC): [7820 · Engine Noise Suppressor](https://openairdocs.org/jasc/7820)
- Part: Muffler
- Part number: 630045503
- Condition: Separated
- Location: Exhaust System
- Stage of operation: IN
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/99ZZZX4197

## Discrepancy

FOUND RISER FROM NR 2 CYLINDER HAD DEPARTED FROM MUFFLER WHILE TROUBLESHOOING ROUGH RUNNING ENGINE.  MUFFLER HAD BEEN REPAIRED 10 HOURS PRIOR TO THIS FLIGHT.

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