# SDR CA110518010

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 16, 2011
- Submitted: September 9, 2011
- Operation: Air carrier
- Make and model: Piper PA-31-350
- Registry model: [Piper PA-31-350](https://openairdocs.org/model/piper-pa-31-350) (OpenAirDocs)
- Aircraft time: 11,680 hours
- Engine: Lyc LTIO540J2BD
- Propeller: Hartzl HCE3YR2A
- System (JASC): [8530 · Reciprocating Engine Cylinder Section](https://openairdocs.org/jasc/8530)
- Part: Cylinder
- Part number: LW12966R
- Condition: Broken
- Location: Engine
- Stage of operation: NR
- How discovered: O
- Nature of condition: R, E
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CA110518010

## Discrepancy

PILOT REPORTED ENGINE RUNNING ROUGH.  MX FOUND NR 4 CYLINDER EXHAUST VALVE HEAD BROKEN OFF AND MISSING.  THE CYLINDER HEAD AND PISTON SURFACE WERE SEVERLY GOUGED.  THE TURBOCHARGER PN 409170-9001 ALSO HAD SEVERAL BROKEN AND DAMAGED TURBINE BLADES.   NR4 CYLINDER ASSY AND TURBOCHARGER REPLACED ENGINE OPERATION CHECKED SERVICEABLE.

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