# SDR 2005FA0001470

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 28, 2005
- Submitted: October 28, 2005
- Operation: General aviation
- Aircraft: [N7721D](https://openairdocs.org/aircraft/N7721D), registered now
- Make and model: Piper PA-22-150
- Registry model: [Piper PA-22-150](https://openairdocs.org/model/piper-pa-22-150) (OpenAirDocs)
- Aircraft serial: 225395
- Aircraft time: 2,309 hours
- Engine: Lyc O320*
- System (JASC): [7497 · Ignition System Wiring](https://openairdocs.org/jasc/7497)
- Part: P-Lead
- Condition: Deteriorated
- Location: Lt Magneto
- Part time: 2,309 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/2005FA0001470

## Discrepancy

DURING RUNUP AFTER ANNUAL INSPECTION, LT MAG WAS NOT WORKING.  FOUND INSULATION ON P-LEAD WIRE WAS DETERIORATING AND SHORTING TO SHIELDING CAUSING MAG TO BE CONTINUOUSLY GROUNDED NO MATTER WHAT SWITCH POSITION WAS.  REPLACED SECTION OF P-LEAD AS REQUIRED.  THIS WIRING IS DIRECTLY ABOVE EXHAUST AND DETERIORATION WAS PROBABLY CAUSED BY HEAT OF EXHAUST SYSTEM OVER TIME.

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