# SDR 2008FA0000529

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 30, 2008
- Submitted: August 7, 2008
- Operation: General aviation
- Aircraft: [N543ER](https://openairdocs.org/aircraft/N543ER), registered now
- Make and model: Cessna 172S
- Registry model: [Cessna 172S](https://openairdocs.org/model/cessna-172s) (OpenAirDocs)
- Aircraft serial: 172S10522
- Engine: Lyc IO360L2A
- System (JASC): [8530 · Reciprocating Engine Cylinder Section](https://openairdocs.org/jasc/8530)
- Part: Guide
- Part number: 74230
- Condition: Seized
- Location: Cylinder Head
- Part time: 889 hours
- Stage of operation: NR
- How discovered: O
- Nature of condition: R, J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2008FA0000529

## Discrepancy

DURING FLIGHT, THE ENGINE STARTED RUNNING ROUGH AND LOST POWER.  EMERGENCY LANDING COMPLETED WITHOUT DAMAGE OR INJURY.  MAINT FOUND THE NR 3 EXHAUST VALVE SEIZED IN THE VALVE GUIDE.  FURTHER INVESTIGATION FOUND THE GUIDE BROKEN IN THE CYLINDER HEAD.  OPERATOR HAS AIRCRAFT WITH THE NEW ROLLER TAPPET ENGINES.  HAVE BEEN PERFORMING A SB388C INSPECTION ON THE REST OF THE FLEET AND HAVE FOUND THE MAJORITY OF THE EXHAUST VALVES FOR ALL CYLINDERS TO BE TIGHT IN THE GUIDES.  MFG RECOMMENDS A 1000 HOUR INTERVAL FOR THESE ENGINES FOR SB388C INSPECTION.  WILL BE INITIATING A 600 HOUR INTERVAL FOR THE SB388C FOR OUR FLEET.  HAVE REVISED LEANING PROCEDURES.  (K)

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