Squawk Box

December 2002 Issue

Crumbling Wire

Aging wire insulation may be tough to inspect, but neglect may cause shorts

The following information is derived from the FAA’s Service Difficulty Reports and Aviation Maintenance Alerts. Click here to view "Flight Control Hardware."


During an aircraft accident investigation, an investigator discovered that the starter and the generator 6-gauge wires had numerous lateral splits in the wire insulation. The accident was not related to the defective wire insulation.

Splitting of the wire insulation appears as small, fine dark scratches on the outer covering of the wires and runs lengthwise along the wire. In some cases, the wire insulation splitting has penetrated the covering and exposed the center elec...

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