Aviation Investigation Report A98H0003

2.17.1  Potential Ignition Sources – General

There is no indication that the fire started outside the reconstructed fire-damaged area. The fire-damaged area contained numerous electrical wires and cables, along with light fixtures, an emergency lights battery pack, two electrically powered galleys, numerous module block electrical connectors, and electrically operated door mechanisms. Testing showed that MPET-covered insulation material can be readily ignited from an arcing event; however, MPET tended to shrink away from sources of high heat, such as might be generated by resistance heating at an under-torqued electrical power or ground wire connection. Various potential ignition sources, including electrical and non-electrical, were evaluated within the fire-damaged area. It was determined that the most likely ignition source was an electrical arcing event involving breached wire insulation that ignited nearby MPET-covered insulation material.

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