# SDR 2006FA0000164

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 7, 2006
- Submitted: February 24, 2006
- Operation: General aviation
- Aircraft: [N6372D](https://openairdocs.org/aircraft/N6372D), registered now
- Make and model: Cessna 172N
- Registry model: [Cessna 172N](https://openairdocs.org/model/cessna-172n) (OpenAirDocs)
- Aircraft serial: 17272758
- Engine: Lyc O360A4M
- System (JASC): [7421 · Spark Plug/Igniter](https://openairdocs.org/jasc/7421)
- Part: Spark Plug
- Part number: UREM40E
- Condition: Defective
- Location: Engine
- Stage of operation: NR
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2006FA0000164

## Discrepancy

DURING THE INSTALLATION AND OPS CHECK OF 2 NEW MAGNETOS, HARNESS AND 8 SPARK PLUGS TO CORRECT A HARD STARTING DISCREPANCY, THE ENGINE HAD A 200 TO 300 RPM MAGNETO DROP O THE LT MAGNETO.  TROBLESHOT THE IGNITION SYSTEM USING A COLD CYLINDER TESTER AND DETERMINED THAT 1 OF 8 SPARK PLUGS WAS DEFECTIVE.  SEEMS TO BE A TREND OF BAD SPARK PLUGS BEING SHIPPED BY MFG. REMOVED DEFECTIVE SPARK PLUG AND REPLACED WITH A KNOWN GOOD SPARK PLUG AND ENGINE OPS CHECKED GOOD.  SPARK PLUGS WERE REPLACED AT TIME OF MAGNETO AND HARNESS CHANGE.  ALL OF THIS BECAUSE OF POOR QUALITY CONTROL.  (K)

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