# SDR USAABB08161

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 17, 2008
- Submitted: October 21, 2008
- Operation: Air carrier
- Aircraft: N905AW
- Make and model: Boeing 757-2S7
- Registry model: [Boeing 757-2S7](https://openairdocs.org/model/boeing-757-2s7) (OpenAirDocs)
- Aircraft serial: 23567
- System (JASC): [2450 · AC Power Distribution System](https://openairdocs.org/jasc/2450)
- Part: Circuit Breaker
- Condition: Failed
- Location: Electrical Sys
- Stage of operation: CR
- How discovered: O
- Nature of condition: H
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/USAABB08161

## Discrepancy

FLT 119- IN CRUISE, LT AC BUSS FAILED.  GENERATOR RESET DID NOT CORRECT CONDITION.  ATTEMPTS TO POWER LT AC BUSS FROM OTHER POWER SOURCES NOT SUCCESSFUL. FLT DIVERTED & LANDED WITHOUT INCIDENT.  REPLACED GROUND POWER CONTACTOR, CURRENT XFORMERS, & BUSS TIE C/B, NO EFFECT.  PERFORMED FIM PROCEDURE 24-22-00.  NO FAULTS FOUND.  FOUND A SUSPECTED SHORTED AFT GALLEY FEEDER WIRE.  WIRES DISCONNECTED, ISOLATION STILL OCCURRED.  PROBLEM ISOLATED TO LT XFER BUSS & CAPTAIN'S CDU.  WITH CDU REMOVED,  OPS OK.  DETERMINED CAPTAIN'S CDU C/B HAD MALFUNCTIONED.  REPLACEMENT  FIXED THE CONDITION.  WIRE CHECKED OK & REINSTALLED.  COFFEEMAKERS & GALLEY POWER LOAD CONTROL UNIT REPLACED.

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