# SDR NACA20020013

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 2, 2002
- Submitted: April 3, 2002
- Operation: Air carrier
- Aircraft: N779TA
- Make and model: Doug DC-6
- Registry model: [Doug DC-6](https://openairdocs.org/model/douglas-dc-6) (OpenAirDocs)
- Aircraft serial: 45529
- Aircraft time: 36,861 hours
- Engine: Pwa R2800*
- Engine time: 690 hours
- System (JASC): [7421 · Spark Plug/Igniter](https://openairdocs.org/jasc/7421)
- Part: Spark Plug
- Part number: URHB32E
- Condition: Damaged
- Location: Nr 3 Engine
- Part time: 336 hours
- Stage of operation: CR
- How discovered: O
- Nature of condition: R
- Precautionary procedure: E, A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/NACA20020013

## Discrepancy

NR 3 ENGINE NR 4 CYLINDER DOUBLE SHORTED SECONDARY, BACKFIRING.  REPLACED BOTH RIGHT AND LEFT SPARK PLUGS.

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