# SDR 2017FA0000152

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 3, 2017
- Submitted: April 4, 2017
- Operation: General aviation
- Aircraft: [N421HP](https://openairdocs.org/aircraft/N421HP), registered now
- Make and model: Cessna 421C
- Registry model: [Cessna 421C](https://openairdocs.org/model/cessna-421c) (OpenAirDocs)
- Aircraft serial: 0831
- Aircraft time: 10,478 hours
- Engine: Cont GTSIO520M
- Engine time: 4,205 hours
- System (JASC): [8530 · Reciprocating Engine Cylinder Section](https://openairdocs.org/jasc/8530)
- Part: Cylinder
- Part number: 658603A6
- Condition: Damaged
- Location: Rt Engine
- Part time: 204 hours
- Stage of operation: IN
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2017FA0000152

## Discrepancy

AT INSPECTION ALL CYLINDERSS, HAD LOW DIFFERENTIAL PRESSURE CHECK, FOUND GLAZING ON CYLINDERSS AND ALL EXHAUST VALVE GUIDES WERE WORN OUT. REPLACED.

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