# SDR UALA2009122203976

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 22, 2009
- Submitted: December 31, 2009
- Operation: Air carrier
- Aircraft: N118UA
- Make and model: Boeing 747422
- Aircraft serial: 28811
- Aircraft time: 43,706 hours, 5,359 cycles
- Engine: Pwa PW4056
- System (JASC): [2421 · AC Generator-Alternator](https://openairdocs.org/jasc/2421)
- Part: Gcu
- Part number: 60B401621
- Part serial: 127
- Condition: Malfunctioned
- Stage of operation: NR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UALA2009122203976

## Discrepancy

'LAV-GALLEY FANS' EICAS STATUS MESSAGE DISPLAYED. BOTH LAV-GALLEY VENT FANS FAILED OR INTERFACE FAIL. FOUND BTB NR3 TRIPPED. REPLACED GCU. GCU GND TEST. NO MSG FOUND.

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