# SDR 99ZZZX2210

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 12, 1999
- Submitted: March 26, 2000
- Operation: General aviation
- Aircraft: [N9623F](https://openairdocs.org/aircraft/N9623F), registered now
- Make and model: Hughes 269C
- Registry model: [Hughes 269C](https://openairdocs.org/model/hughes-269c) (OpenAirDocs)
- Aircraft serial: 800031
- System (JASC): [2434 · DC Generator-Alternator](https://openairdocs.org/jasc/2434)
- Part: Pulley
- Part number: ALU8AZIR
- Condition: Damaged
- Location: Alternator
- Part time: 71 hours
- Stage of operation: NR
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/99ZZZX2210

## Discrepancy

ALTERNATOR PULLEY COOLING FINS BECAME DETACHED FROM PULLEY CAUSING ALTERNATOR TO VIBRATE OFF ENGINE SHEARING BRACKET BOLTS.  INSTALLED NEW BOLTS AND ALTERNATOR.  PROBLEM HAS NOT RECURRED.  POSSIBLE CAUSE IS FATIGUE OF COOLING FINS.  SUBMITTER SUGGESTED INSPECTION OF FINS EACH 100 HOURS FOR CRACKS.

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