# SDR MLJ2008F00000

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 14, 2008
- Submitted: January 28, 2008
- Operation: Air carrier
- Aircraft: [N790DM](https://openairdocs.org/aircraft/N790DM), registered now
- Make and model: Cessna 310Q
- Registry model: [Cessna 310Q](https://openairdocs.org/model/cessna-310q) (OpenAirDocs)
- Aircraft serial: 310Q0828
- Engine: Cont IO470VO
- System (JASC): [8530 · Reciprocating Engine Cylinder Section](https://openairdocs.org/jasc/8530)
- Part: Piston
- Part number: AEC648029
- Condition: Failed
- Location: Nr 2 Cylinder
- Part time: 933 hours
- Stage of operation: NR
- 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/MLJ2008F00000

## Discrepancy

THE LT ENGINE WAS EXHIBITING LOW OIL PRESSURE.  THE OIL FILTER WAS PULLED, CUT OPEN, AND INSPECTED.  A SIGNIFICANT AMOUNT OF METAL WAS FOUND.  THE ENGINE WAS THEN TORN DOWN FOR FURTHER INSPECTION.  CHUNKS OF PISTON SKIRTING WAS FOUND IN THE OIL PAN, NR 2 PISTON HAD COME APART AT THE SKIRTING AROUND THE BOTTOM RING-LAND BELOW THE PISTON PIN, AND THE NR 1 PISTON WAS FOUND THE BE CRACKED IN THE SAME AREA THAT THE NR 2 PISTON WAS BROKEN.  NR 2 PISTON TAKEN FOR METALLURGICAL TESTING.  A POSSIBLE CONTRIBUTING FACTOR MAY HAVE BEEN THE START OF THE ENGINE AT A TEMPERATURE NEAR 0 DEGREES (F).  (K)

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