# SDR 2016FA0000421

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 30, 2016
- Submitted: September 12, 2016
- Operation: General aviation
- Aircraft: [N781LU](https://openairdocs.org/aircraft/N781LU), 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: 4496369
- Aircraft time: 1,069 hours
- Engine: Lyc LO360A1H6
- Engine time: 1,069 hours
- System (JASC): [8530 · Reciprocating Engine Cylinder Section](https://openairdocs.org/jasc/8530)
- Part: Cylinder
- Part number: 05K21104
- Condition: Cracked
- Location: Nr 3
- Part time: 1,066 hours
- Stage of operation: IN
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2016FA0000421

## Discrepancy

NR 3 CYLINDER HAD A CRACK FROM OUTSIDE OF CYLINDER THROUGH INTO COMBUSTION CHAMBER, APPROXIMATELY 2 INCHES INBOARD OF WHERE CYLINDER HEAD MEETS BARREL.  NO INDICATIONS FROM FLIGHT CREW. A GENERAL NOISE WAS OBSERVED FROM MAINTENANCE PERSONEL DURING A ROUTINE 50 HOUR OIL CHANGE WHICH INCLUDED A DIFFERENTIAL CYLINDER LEAK CHECK.

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