# SDR L48S2016FA0000445

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 24, 2016
- Submitted: September 20, 2016
- Operation: General aviation
- Aircraft: [N783LU](https://openairdocs.org/aircraft/N783LU), registered now
- Make and model: Piper PA-44-180
- Registry model: [Piper PA-44-180](https://openairdocs.org/model/piper-pa-44-180) (OpenAirDocs)
- Aircraft serial: 4496391
- Aircraft time: 440 hours
- Engine: Lyc O360A1H6
- Engine time: 440 hours
- System (JASC): [8530 · Reciprocating Engine Cylinder Section](https://openairdocs.org/jasc/8530)
- Part: Cylinder
- Part number: 05K21104
- Condition: Worn
- Location: Lt Engine
- Part time: 440 hours
- Component: Engine, Lyc, O360A1H6
- Component part number: O360A1H6
- 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/L48S2016FA0000445

## Discrepancy

DURING 50 HOUR OIL CHANGE OF LT ENGINE CYLINDER 2 AND 4 FAILED DIFFERENTIAL PRESSURE CYLINDER LEAK CHECK.  LEAK BY EXHAUST VALVES ON BOTH CYLINDERS.

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