# SDR 2004FA0000293

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 5, 2004
- Submitted: April 7, 2004
- Operation: General aviation
- Aircraft: N2650U
- Make and model: Cessna 172D
- Registry model: [Cessna 172D](https://openairdocs.org/model/cessna-172d) (OpenAirDocs)
- Aircraft serial: 17250250
- Engine: Cont O300D
- System (JASC): [8530 · Reciprocating Engine Cylinder Section](https://openairdocs.org/jasc/8530)
- Part: Retainer
- Condition: Worn
- Location: Engine
- Stage of operation: NR
- How discovered: 9
- Nature of condition: R
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2004FA0000293

## Discrepancy

FOUND PN 24077, UPPER VALVE SPRING RETAINER WORN OUT ALLOWING VALVE SPRING TO BYPASS IT.  CAUSED LOSS OF STATIC RPM AND SOME ROUGHNESS OCCASIONALLY.

---
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.