# SDR 95ZZZX3267

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 16, 1995
- Submitted: March 26, 2000
- Operation: General aviation
- Aircraft: [N64456](https://openairdocs.org/aircraft/N64456), registered now
- Make and model: Cessna 172M
- Registry model: [Cessna 172M](https://openairdocs.org/model/cessna-172m) (OpenAirDocs)
- Aircraft serial: 17265243
- Engine: Lyc O360A4M
- System (JASC): [8530 · Reciprocating Engine Cylinder Section](https://openairdocs.org/jasc/8530)
- Part: Valve
- Part number: AL19001
- Condition: Worn
- Location: Exhaust
- Part time: 165 hours
- Stage of operation: IN
- Nature of condition: E, R
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/95ZZZX3267

## Discrepancy

ENGINE WAS OVERHAULED 7-25-94.  SPIRIT AIR VALVES, PN AL19001 AND AL73938, WERE INSTALLED NEW AT THAT TIME.  AT 165.0 HOURS TSO, ENGINE RAN ROUGH.  INSPECTION REVEALED ALL EXHAUST VALVES, PN AL19001, HAD ABNORMAL WEAR, ONE BEING EXTREME AND VERY NEAR FAILURE.  ONLY ONE OF THE VALVE TIPS HAD NOT ERODED THE PART NUMBER AWAY.  IT IS MARKED FAA-PMA Z 6 94 AL19001.  TOTAL ENGINE FAILURE WAS IMMINENT.

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