# SDR 98ZZZX2435

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 3, 1998
- Submitted: March 26, 2000
- Operation: General aviation
- Aircraft: [N131CW](https://openairdocs.org/aircraft/N131CW), registered now
- Make and model: Cvac C131D
- Aircraft serial: 542809
- Engine: Pwa R2800103W
- System (JASC): [8530 · Reciprocating Engine Cylinder Section](https://openairdocs.org/jasc/8530)
- Part: Cylinder
- Part number: 615324
- Condition: Worn
- Location: Nr 1 Eng Nr 3
- Stage of operation: IN
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/98ZZZX2435

## Discrepancy

CYLINDER ASSY HAD EXTREME CLEARANCES BETWEEN VALVES AND VALVE GUIDES WHICH IS NOT INDICATIVE OF 167.1 HOURS OF OPERATION ON A CYLINDER ASSY.  UTILIZING USAF SPECS, I.E., SODIUM FILLED DOME TYPE EXHAUST VALVES AND CLOSE TOLERANCE STEEL VALVE GUIDES.  ALSO, EXCESSIVE PISTON TO CYLINDER BARREL SCUFFING.  THIS CYLINDER ASSY SHOWS EVIDENCE OF 1,000 HOURS OF OPERATION USAGE.

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