# SDR NACA20030119

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 28, 2003
- Submitted: October 29, 2003
- Operation: Air carrier
- Aircraft: [N43872](https://openairdocs.org/aircraft/N43872), registered now
- Make and model: Doug DC-6
- Registry model: [Doug DC-6](https://openairdocs.org/model/douglas-dc-6) (OpenAirDocs)
- Aircraft serial: 533294
- Aircraft time: 34,991 hours
- Engine: Pwa R2800CB3
- Engine time: 1,834 hours
- System (JASC): [7421 · Spark Plug/Igniter](https://openairdocs.org/jasc/7421)
- Part: Spark Plug
- Condition: Cracked
- Location: Nr 3 Engine
- Part time: 375 hours
- Component: Engine, Pwa
- Stage of operation: CR
- How discovered: O
- Nature of condition: R, J
- Precautionary procedure: E
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/NACA20030119

## Discrepancy

NR 3 ENGINE SHUT DOWN DUE TO BACK FIRING AND RUNNING ROUGH. NR 1 CYLINDER DOUBLE SHORTED SECONDARY.  REPLACED NR 1, NR 2 AND NR 4 CYLINDERS SPARK PLUGS DUE TO FOULING AND CRACKED CERAMICS.

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