# SDR ASAA9940162

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 11, 1999
- Submitted: May 3, 2000
- Operation: Air carrier
- Aircraft: N772AS
- Make and model: Boeing 737-4Q8
- Registry model: [Boeing 737-4Q8](https://openairdocs.org/model/boeing-737-4q8) (OpenAirDocs)
- Aircraft serial: 25105
- System (JASC): [2450 · AC Power Distribution System](https://openairdocs.org/jasc/2450)
- Part: Harness
- Condition: Failed
- Location: Fuselage
- Stage of operation: CL
- How discovered: V
- Nature of condition: G, J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA9940162

## Discrepancy

PDX-ATB OF F500 DUE TO MULTIPLE CIRCUIT BREAKERS POPPED.  AIRCRAFT RETURNED TO PDX.  PDX MAINTENANCE INSPECTED AND FOUND A FAILURE OF THE WIRE BUNDLE INSULATION AT BS 410, WL 203, RBL 58 (BEHIND LINER IN FORWARD CARGO COMPARTMENT AFT OF E/E BULKHEAD AND FORWARD OF THE FORWARD CARGO DOOR).  MAINTENANCE REPLACED THE WIRING ON A/C 772.  THERE WERE NO SYSTEM PROBLEMS FOUND DURING THE REPAIR OR SUBSEQUENT SYSTEM CHECKS THAT WOULD HAVE CAUSED THE WIRING TO OVERLOAD.  EO 2400-01047 WAS ACCOMPLISHED ON THE 737-400 FLEET WITH NO EVIDENT SYSTEM FINDINGS.  BASED ON THESE FINDINGS IT WOULD INDICATE THAT THE DISCREPANCY ON A/C 772 WAS AN ISOLATED OCCURANCE OF WIRE CHAFING.  (M)

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