# SDR CA040618007

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 17, 2004
- Submitted: December 3, 2004
- Operation: General aviation
- Make and model: Doug C-54
- Registry model: [Doug C-54](https://openairdocs.org/model/douglas-c-54) (OpenAirDocs)
- Engine: Pwa R20007M2
- System (JASC): [7421 · Spark Plug/Igniter](https://openairdocs.org/jasc/7421)
- Part: Spark Plug
- Part number: REB37E
- Condition: Fouled
- Location: Nr 4 Engine
- Stage of operation: CR
- How discovered: O
- Nature of condition: R, E
- Precautionary procedure: E
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CA040618007

## Discrepancy

DURING CRUISE, THE PILOTS NOTICED THE NR 4 ENGINE STARTING TO BACKFIRE, THE BACK FIRING WAS GETTING OUT OF CONTROL SO THE ENGINE WAS SHUT DOWN AND THE PROPELLER FEATHERED.  DURING THE INSPECTION OF THE NR 4 ENGINE IT WAS FOUND THAT THE FRONT AND REAR SPARKS FOR THE NR 2 CYLINDER WERE FOULED.  THE PLUGS WERE REPLACED AND ENGINE RUN-UP WAS FINE.

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