# SDR CA090826009

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 9, 2009
- Submitted: October 23, 2009
- Operation: General aviation
- Make and model: Cessna 421C
- Registry model: [Cessna 421C](https://openairdocs.org/model/cessna-421c) (OpenAirDocs)
- Aircraft time: 5,518 hours
- Engine: Cont GTSIO520L
- Propeller: Mcauly 3FF32C501
- System (JASC): [8530 · Reciprocating Engine Cylinder Section](https://openairdocs.org/jasc/8530)
- Part: Valve Spring
- Part number: 637837
- Condition: Broken
- Location: Exhaust Valve
- Part time: 1,304 hours
- Stage of operation: CR
- How discovered: O
- Nature of condition: R, B
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CA090826009

## Discrepancy

(CAN) CREW REPORTED RT ENG RUNNING ROUGH.  UPON INSP, MX FOUND NR5 CYL EXHAUST VALVE SPRING BROKEN.  SPRING REPLACED AND ENG GROUND RUN NORMAL.

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