smoke in the cockpit. in a search to find out has went wrong, investigators discover that a common aircraft insulation material is a fire hazard. thousands of planes are fitted with new insulation. and flammability testing is re-evaluated. but they still don't know how the fire started, and if other aircraft are at risk. >> when we started to look for potential ignition sources the very first thing that comes to mind is aircraft wiring. >> the investigators scour more than 150 miles of wiring for signs of an electrical malfunction called arcing. >> arcing events are when electricity jumps from a wire to another piece of metal. it can be another wire or a part of the airplane or something else. when it does that, it can create tremendous amount of heat. >> finding an arcing event is
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