# SDR 98ZZZX2961

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 9, 1998
- Submitted: March 26, 2000
- Operation: General aviation
- Aircraft: [N444HC](https://openairdocs.org/aircraft/N444HC), registered now
- Make and model: Lear 31A
- Registry model: [Lear 31A](https://openairdocs.org/model/learjet-31a) (OpenAirDocs)
- Aircraft serial: 064
- System (JASC): [2435 · Starter-Generator](https://openairdocs.org/jasc/2435)
- Part: Generator
- Part number: 23080023
- Condition: Failed
- Location: Lt Eng Start/Gen
- Part time: 1,429 hours
- Component: Lucas
- Stage of operation: CR
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/98ZZZX2961

## Discrepancy

LEFT ENGINE STARTER/GENERATOR DRIVE END BEARING FAILED CAUSING CATASTROPHIC FAILURE OF STARTER/GENERATOR.  (IN-FLIGHT).  STARTER/GENERATOR DRIVE SHAFT FAILED TO SHEAR AS DESIGNED RESULTING IN SEVERE VIBRATION, ENGINE IN-FLIGHT SHUT DOWN, ENGINE DAMAGE.  SHAFT TESTING BY LUCAS ASEROSPACE SHOWED NORMAL AS DESIGNED.

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