# SDR 5SW2020010800000

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 15, 2019
- Submitted: January 8, 2020
- Operation: Air carrier
- Aircraft: [N787SP](https://openairdocs.org/aircraft/N787SP), registered now
- Make and model: Cessna 172S
- Registry model: [Cessna 172S](https://openairdocs.org/model/cessna-172s) (OpenAirDocs)
- Aircraft serial: 172S8714
- Engine: Lyc IO360L2A
- System (JASC): [8530 · Reciprocating Engine Cylinder Section](https://openairdocs.org/jasc/8530)
- Part: Exhaust Valve
- Condition: Sticking
- Location: Engine
- Stage of operation: NR
- How discovered: O
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/5SW2020010800000

## Discrepancy

ENGINE S/N L-19263-51E WAS FOUND WITH A STICKING EXHAUST EXHAUST VALVE AT 385.3 HOURS TOTAL TIME.  LYCOMING SB388C WAS PERFORMED, ALL THE GUIDES WERE REAMED WITHIN BALANCE.  THIS ENGINE INCORPORATES NI-RESIST VALVE GUIDES AND THE TIME TO FAILURE IS CONSIDERED BY THIS AGENCY TO BE PREMATURE.

---
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.