# SDR W6T2002F00000

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 30, 2002
- Submitted: November 13, 2002
- Operation: Air carrier
- Aircraft: [N495SC](https://openairdocs.org/aircraft/N495SC), registered now
- Make and model: Piper PA-31-350
- Registry model: [Piper PA-31-350](https://openairdocs.org/model/piper-pa-31-350) (OpenAirDocs)
- Aircraft serial: 318052062
- Engine: Lyc LTIO540J2BD
- System (JASC): [8530 · Reciprocating Engine Cylinder Section](https://openairdocs.org/jasc/8530)
- Part: Stud
- Part number: 76220
- Condition: Broken
- Location: Nr 4 Cylinder
- Stage of operation: IN
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/W6T2002F00000

## Discrepancy

NEW STUDS AND THRU BOLTS OF OFF ON FINAL APPROACH, THE RT ENGINE STARTED RUNNING ROUGH FURTHER INVESTIGATION REVEALED THAT THE NR 4 CYLINDER EXHAUST WAS CRACKED.  THIS WAS CRACKED BECAUSE THE NR 4 CYLINDER THRU-BOLTS BROKE WHICH ALLOWED OTHER HOLD-DOWN STUDS TO BREAK WHICH ALLOWED THE CYLINDER TO PARTIALLY SEPARATE FROM THE CRANKCASE.

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