# SDR 2003FA0000976

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 15, 2003
- Submitted: September 25, 2003
- Operation: General aviation
- Aircraft: [N421GC](https://openairdocs.org/aircraft/N421GC), registered now
- Make and model: Cessna 421B
- Registry model: [Cessna 421B](https://openairdocs.org/model/cessna-421b) (OpenAirDocs)
- Aircraft serial: 421B0926
- Engine: Cont GTSIO520H
- Engine time: 4,526 hours
- System (JASC): [7421 · Spark Plug/Igniter](https://openairdocs.org/jasc/7421)
- Part: Spark Plug
- Part number: URHB32E
- Part serial: NA
- Condition: Cracked
- Location: Engine
- Part time: 177 hours
- Stage of operation: IN
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2003FA0000976

## Discrepancy

DURING ROUTINE 100 HR INSPECTION 4 SPARK PLUGS ON RIGHT ENGINE FOUND TO HAVE CRACKS IN THE PLUG BODY BETWEEN THE GASKET SURFACE AND THE WRENCH HEX.

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