# SDR 2007UALA04312

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 18, 2007
- Submitted: October 23, 2007
- Operation: Air carrier
- Aircraft: [N787UA](https://openairdocs.org/aircraft/N787UA), registered now
- Make and model: Boeing 777222
- Aircraft serial: 26939
- Aircraft time: 45,770 hours, 7,091 cycles
- Engine: Pwa PW4090
- System (JASC): [2420 · AC Generation System](https://openairdocs.org/jasc/2420)
- Part: Circuit Breaker
- Condition: Burned
- Location: Apu
- Stage of operation: IN
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2007UALA04312

## Discrepancy

APU GEN IS INOPERATIVE.  REPLACED APB CONTACTOR . APU OPS CHECKED GOOD.  SUSPECT AUX POWER BREAKER BURNED AND UNABLE TO HOLD SET POSITION. AC OK FOR SERVICE.

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