# SDR A9JA2012F00106

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 6, 2012
- Submitted: June 6, 2012
- Operation: Air carrier
- Aircraft: [N90BA](https://openairdocs.org/aircraft/N90BA), registered now
- Make and model: Lear 31
- Registry model: [Lear 31](https://openairdocs.org/model/learjet-31) (OpenAirDocs)
- Aircraft serial: 018
- Aircraft time: 7,575 hours, 7,494 cycles
- Engine: Garrtt TFE731*
- Engine time: 7,394 hours, 7,256 cycles
- System (JASC): [2435 · Starter-Generator](https://openairdocs.org/jasc/2435)
- Part: Starter Gen
- Part number: 66084582
- Part serial: 4948
- Condition: Failed
- Location: Zone 400
- Part time: 3,000 hours, 3,000 cycles
- Stage of operation: CR
- How discovered: O
- Nature of condition: E, H, F
- Precautionary procedure: A, H
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/A9JA2012F00106

## Discrepancy

PILOTS NOTICED A VIBTATION IN FLIGHT (APP 25 MIN. INTO FLIGHT).  CREW TRIED TO DETERMINE SOURCE OF VIBRATION (RUMBLE).  RT GENERATOR WENT OFF LINE, CREW RETURNED TO HOME BASE.  REMOVED RT STARTER/GENERATOR AND FOUND THE BEARINGS & SHAFT SHIFTED OUT OF THE STARTER/GEN HOUSING DESTROYING INTERNAL COMPONETS.  STARTER/GENERATOR IS BEING SENT TO REPAIR/O/H FACILITY TO DETERMINE CAUSE OF CATISTROPHIC FAILURE.

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