# SDR 2008UALA05576

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 3, 2008
- Submitted: September 26, 2008
- Operation: Air carrier
- Aircraft: [N652UA](https://openairdocs.org/aircraft/N652UA), registered now
- Make and model: Boeing 767322
- Aircraft serial: 25390
- Aircraft time: 70,276 hours, 11,485 cycles
- Engine: Pwa PW4060
- System (JASC): [2400 · Electrical Power System](https://openairdocs.org/jasc/2400)
- Part: Control Unit
- Part number: 734285E
- Condition: Failed
- Stage of operation: CR
- 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/2008UALA05576

## Discrepancy

EICAS MSG (L,R) UTIL BUSS OFF DISPLAYED. UTILITY BUSS OFF LGT ILLUM. SYS FAILED TO RESET.  BUSS PCU FAILURE.  REPLACED BUSS POWER CONTROL UNIT.TESTS OKAY. RAN BOTH ENGINES & RAN ALL ELECTRICAL POWER SYSTEMS USING ALT BUSSES ALL INDICATION & OPS NORMAL.

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