# SDR CWQA20260306001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 2, 2026
- Submitted: March 6, 2026
- Operation: Air carrier
- Aircraft: N993JC
- Make and model: Emb EMB-135BJ
- Registry model: [EMB EMB-135BJ](https://openairdocs.org/model/embraer-emb-135bj) (OpenAirDocs)
- Aircraft serial: 14501064
- Aircraft time: 5,311 hours, 2,205 cycles
- System (JASC): [2430 · DC Generating System](https://openairdocs.org/jasc/2430)
- Part: Bearing
- Condition: Failed
- Location: Nr 4 Generator
- Component: Generator, Lucas
- Component part number: 3008611
- Stage of operation: CR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CWQA20260306001

## Discrepancy

DURING CRUISE CREW RECEIVED GEN 4 OFF BUS AND GEN4 BRG FAIL MESSAGES. CREW FOLLOWED CHECKLIST AND SUBSEQUENT LANDING PERFORMED WITHOUT INCIDENT.  MAINTENANCE EVALUATION FOUND #4 GENERATOR HAD A BEARING FAILURE WHERE INSTEAD OF SHAFT SHEARING AS EXPECTED, THE CASE BROKE AT THE COOLING CUTOUT OUTLETS NEAR THE FLANGE CAUSING THE MAIN BODY OF THE GENERATOR TO ROTATE AND TWIST THE POWER ELECTRICAL CABLES UNTIL THE GENERATOR SHAFT FINALLY SHEARED.  THE GENERATOR AND 3 MAIN ELECTRICAL POWER CABLES AND OTHER ELECTRICAL WIRING REQUIRED REPLACEMENT.  REVIEW OF THE GENERATOR OVERHAUL DOCUMENTS REVEALED CONCERN THE CMM USED WAS AN OLD REVISION OF REV. 6 INSTEAD OF THE CURRENT REVISION OF REV. 12.

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