# SDR UALA200901090099

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 9, 2009
- Submitted: January 12, 2009
- Operation: Air carrier
- Aircraft: N598UA
- Make and model: Boeing 757222
- Aircraft serial: 28751
- Aircraft time: 39,707 hours, 10,985 cycles
- Engine: Pwa PW2037
- System (JASC): [2450 · AC Power Distribution System](https://openairdocs.org/jasc/2450)
- Part: Bpcu
- Part number: 734285D
- Condition: Failed
- Location: Electrical Sys
- Stage of operation: CL
- How discovered: O
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UALA200901090099

## Discrepancy

JUST PRIOR TO REACHING CRUISE, BOTH UTILITY BUSSES TRIPPED.  SINGLE RESET OF BOTH UTILITY BUSES NO HELP. UTILITY BUSSES RESET 4 TIMES, NO HELP.  REPLACED BPCU. SYS OPS NORMAL, ALL BUSSES RESET AND FUNCTION NORMALLY.

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