# SDR 20001017SH042

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 7, 2000
- Submitted: October 17, 2000
- Operation: General aviation
- Aircraft: [N8366Z](https://openairdocs.org/aircraft/N8366Z), registered now
- Make and model: Piper PA-28-181
- Registry model: [Piper PA-28-181](https://openairdocs.org/model/piper-pa-28-181) (OpenAirDocs)
- Aircraft serial: 288190206
- System (JASC): [2434 · DC Generator-Alternator](https://openairdocs.org/jasc/2434)
- Part: Alternator
- Part number: 4111809
- Condition: Failed
- Location: Solder Tab Lngth
- Stage of operation: CR
- How discovered: W
- Nature of condition: H
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/20001017SH042

## Discrepancy

DURING TRAINING FLIGHT, PILOT NOTICED SEVERAL HIGH AMPERAGE SPIKES FOLLOWED BY A TOTAL LOSS OF ELECTRICAL OUTPUT FROM THE ALTERNATOR.  ALSO DAMAGED ELECTRICALLY WERE THE VOLTAGE REGULATOR AND OVERVOLTAGE RELAY.  POSSIBLE CAUSE FOUND DURING A BENCH CHECK OF AFFECTED ALTERNATOR, AN ARCING FROM FIELD TERMINAL LUG TO THE TIP OF THE REAR COOLING FAN.  ABRASIONS FOUND ON ALL OF THE COOLING FAN TIPS INDICATED A CONTINUOUS ARCING HAD BEEN OCCURRING.  THE MATTER HAS BEEN BROUGHT TO THE ATTENTION OF THE ELECTROSYSTEMS, INC.  (X)

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