# SDR UALA2012061503294

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 14, 2012
- Submitted: June 23, 2012
- Operation: Air carrier
- Aircraft: [N676UA](https://openairdocs.org/aircraft/N676UA), registered now
- Make and model: Boeing 767322
- Aircraft serial: 30028
- Aircraft time: 41,535 hours, 10,336 cycles
- Engine: Pwa PW4052
- System (JASC): [2497 · Electrical Power System Wiring](https://openairdocs.org/jasc/2497)
- Part: Bpcu
- Part number: 734285D
- Part serial: 139
- Condition: Failed
- Location: Electrical Buss
- Stage of operation: NR
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UALA2012061503294

## Discrepancy

BOTH UTILITY BUSSES TRIPPED OFF UPON TRANSFER TO APU POWER. REPLACED BPCU PER AMM & OPS CHECKED ELECTRICAL SYS WITH BOTH ENGINES RUNNING.  BOTH UTILITY BUSSES TRANSFER OK FROM ENGINE TO APU POWER.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.