# SDR UALA2012071103735

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 8, 2012
- Submitted: July 13, 2012
- Operation: Air carrier
- Aircraft: [N228UA](https://openairdocs.org/aircraft/N228UA), registered now
- Make and model: Boeing 777222
- Aircraft serial: 30556
- Aircraft time: 44,701 hours, 5,435 cycles
- Engine: Pwa PW4090
- System (JASC): [2421 · AC Generator-Alternator](https://openairdocs.org/jasc/2421)
- Part: Converter
- Condition: Failed
- Location: Backup Generator
- Stage of operation: NR
- How discovered: O
- Nature of condition: H
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UALA2012071103735

## Discrepancy

FAILURE IN THE BACKUP ELECTRICAL SYSTEM HAS OCCURRED THAT CANNOT BE ATTRIBUTED TO A BACKUP GENERATOR.  REPLACED GEN BACKUP CONVERTER, ALL TESTED NORMAL.  REPLACED GENERATOR BACKUP CONVERTER, ALL TESTS NORMAL.  SUCCESSFUL ENGINE RUN TEST.

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