# SDR 97UAL900335

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 27, 1997
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: [N663UA](https://openairdocs.org/aircraft/N663UA), registered now
- Make and model: Boeing 767322
- Aircraft serial: 27160
- Engine: Pwa PW4060
- System (JASC): [2424 · AC Regulator](https://openairdocs.org/jasc/2424)
- Part: Circuit Breaker
- Part number: B4301
- Condition: Failed
- Location: Lt/Rt Gcu
- Component: AUXCONTACT
- Stage of operation: TO
- Nature of condition: J
- Precautionary procedure: D
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/97UAL900335

## Discrepancy

AIRCRAFT RETURNED TO SFO AFTER BOTH UTILITY BUS OFF LIGHTS CAME ON DURING TAKEOFF.  *S/D*  LEFT GENERATOR CONTROL BREAKER AUXILIARY CONTACT FAILED.  REPLACED LEFT AND RIGHT GENERATOR CONTROL BREAKERS.

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