# SDR DUFA20070002

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 10, 2007
- Submitted: January 3, 2008
- Operation: Air carrier
- Aircraft: [N80BS](https://openairdocs.org/aircraft/N80BS), registered now
- Make and model: Cessna 404
- Registry model: [Cessna 404](https://openairdocs.org/model/cessna-404) (OpenAirDocs)
- Aircraft serial: 4040048
- Aircraft time: 16,328 hours
- Engine: Cont GTSIO520M
- Engine time: 1,391 hours
- System (JASC): [8530 · Reciprocating Engine Cylinder Section](https://openairdocs.org/jasc/8530)
- Part: Stud
- Part number: 6461401
- Condition: Sheared
- Location: Nr 5 Cylinder
- Part time: 641 hours
- Stage of operation: AP
- How discovered: O
- Nature of condition: E
- Precautionary procedure: E
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DUFA20070002

## Discrepancy

WHILE ON APPROACH TO AIRPORT, THE PILOT NOTICED MANIFOLD PRESSURE DROPPING AS WELL AS OIL PRESSURE FROM THE RIGHT ENGINE. HE ALSO BEGAN TO FEEL A VIBRATION FROM THE SAME ENGINE. HE ELECTED TO SHUT THE ENGINE DOWN AND MADE AN UNEVENTFUL LANDING. UPON INSPECTION, THE NR 5 CYLINDER HOLD DOWN STUDS HAD SHEARED AND ALLOWED THE CYLINDER TO HAMMER AGAINST THE ENGINE CASE AND COWLING. THIS IN TURN RIPPED THE RT EXHAUST STACK FROM THE NR 1 AND NR 5 CYLINDERS CAUSING HEAT DISTRESS AT THE COWL DOOR.

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