# SDR UALA2009082102580

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 21, 2009
- Submitted: August 21, 2009
- Operation: Air carrier
- Aircraft: N597UA
- Make and model: Boeing 757222
- Aircraft serial: 28750
- Aircraft time: 41,831 hours, 11,646 cycles
- Engine: Pwa PW2037
- System (JASC): [2421 · AC Generator-Alternator](https://openairdocs.org/jasc/2421)
- Part: Bpcu
- Part number: 734285D
- Part serial: 33
- Condition: Malfunctioned
- Location: Electrical Sys
- Stage of operation: TX
- How discovered: O
- Nature of condition: J
- Precautionary procedure: D
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UALA2009082102580

## Discrepancy

EICAS MSG L GEN OFF DISPLAYED.  GEN OFF LIGHT ILLUM.   OPERATED NORM AFTER RESET.  CREW COMMENTS:  RESET OKAY.  REPLACED BPCU.  SWAPPED NR 2 AND APU GCU'S PRECAUTIONARY.  RAN BOTH ENGINES, BOTH ENGINES AUTO R TRANSFER FROM APU AND BACK TO APU ON ENGINE SHUT DOWN.  SYSTEMS BITE CHECK OK.

---
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, except the copies of manufacturers’ service documents, which belong to their rights holders.