# SDR 96ZZZX603

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 7, 1995
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: N55479
- Make and model: Cessna 172P
- Registry model: [Cessna 172P](https://openairdocs.org/model/cessna-172p) (OpenAirDocs)
- Aircraft serial: 17275191
- Engine: Lyc O320D2J
- System (JASC): [8530 · Reciprocating Engine Cylinder Section](https://openairdocs.org/jasc/8530)
- Part: Valve
- Condition: Sticking
- Location: Cylinder 1-2 Exh
- Part time: 755 hours
- Stage of operation: CL
- Nature of condition: E, R
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/96ZZZX603

## Discrepancy

DURING TAKEOFF, AIRCRAFT ENGINE BECAME VERY ROUGH.  PILOT COULD NOT DUPLICATE ON GROUND.  FURTHER INVESTIGATION FOUND NR 1 AND NR 2 CYLINDER EXHAUST VALVES STICKING.  REMOVED AND CLEANED ALL FOUR CYLINDER EXHAUST VALVES AND GUIDES.  THIS IS SECOND OCCURRENCE WITH THIS ENGINE.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.