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Reporter describes wire bundle that has a short. Unknown if electrical arcing was preflight or in-flight.
| Attributes | |
| ACN | 155710 |
| Time | |
| Date | 199008 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : mdw |
| State Reference | IL |
| Altitude | agl bound lower : 0 agl bound upper : 0 |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | Small Transport, Low Wing, 2 Turboprop Eng |
| Flight Phase | ground : preflight |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : instrument pilot : atp pilot : cfi pilot : commercial |
| Experience | flight time last 90 days : 227 flight time total : 2161 flight time type : 1200 |
| ASRS Report | 155710 |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Independent Detector | other flight crewa |
| Resolutory Action | other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
From what I saw of the overhead panel, it appears some wires were rubbing against a screw head which eventually eroded the wire bundles insulation away causing contact between wires which caused some arcing and shorted out the electric. This is strictly my opinion. To solve the problem would require the wire bundle to be reinforced at screw head location with something that would not allow the screw head to 1) rub through the wires, and 2) to rub at all against the wire bundles.
Original NASA ASRS Text
Title: REPORTER DESCRIBES WIRE BUNDLE THAT HAS A SHORT. UNKNOWN IF ELECTRICAL ARCING WAS PREFLT OR INFLT.
Narrative: FROM WHAT I SAW OF THE OVERHEAD PANEL, IT APPEARS SOME WIRES WERE RUBBING AGAINST A SCREW HEAD WHICH EVENTUALLY ERODED THE WIRE BUNDLES INSULATION AWAY CAUSING CONTACT BTWN WIRES WHICH CAUSED SOME ARCING AND SHORTED OUT THE ELECTRIC. THIS IS STRICTLY MY OPINION. TO SOLVE THE PROB WOULD REQUIRE THE WIRE BUNDLE TO BE REINFORCED AT SCREW HEAD LOCATION WITH SOMETHING THAT WOULD NOT ALLOW THE SCREW HEAD TO 1) RUB THROUGH THE WIRES, AND 2) TO RUB AT ALL AGAINST THE WIRE BUNDLES.
Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.