# SDR 96ZZZX473

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 5, 1995
- Submitted: March 26, 2000
- Operation: General aviation
- Aircraft: N4046Q
- Make and model: Cessna 402CESSNA
- Aircraft serial: 4020146
- System (JASC): [2410 · Alternator-Generator Drive](https://openairdocs.org/jasc/2410)
- Part: Alternator
- Part number: 1100723
- Condition: Bearing Failed
- Location: Drive Gear
- Stage of operation: CL
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/96ZZZX473

## Discrepancy

SHORTLY AFTER TAKEOFF, THE RT ENGINE STARTED LOSING OIL PRESSURE.  THE PILOT RETURNED TO THE DEPARTING AIRPORT.  INSPECTION OF THE OIL FILTER REVEALED A LARGE QUANTITY OF METAL.  ON ENGINE TEAR DOWN, THE ALTERNATOR DRIVE GEAR WAS FOUND BROKEN.  THE ALTERNATOR FRONT BEARING WAS DESTROYED.  SUBMITTER SUGGESTED 500-HOUR SERVICE LIFE ON BEARING, 250-HOUR INSPECTIONS.

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