Ground fire of a Swearingen SA226TC Metro II in Hot Springs

Turning onto the runway the copilot observed a flash behind his instrument panel. He then received an electrical shock to his right arm from the right console. A fire then erupted at the lower right hand corner of his instrument panel. The crew and pax evacuated the aircraft. The interior of the aircraft was consumed by fire as well as most of the upper half of the fuselage. Examination of the right side wire bundle revealed numerous indications of arcing between wires and from wires to ground. One wire was arced at a point in line with a plastic oxygen line. There was also an oily residue inside the wire bundle. A small section of the right brake pressure line exhibited signs of elect arcing. The hydraulic system pressure gage copper line also showed signs of arcing. The plastic oxygen lines from the the cockpit side of the forward pressure bulkhead to the cockpit outlets had been consumed by fire and the oxygen supply was depleated.