What was found
ELECTRICAL FIRE IN FLIGHT IN THE VICINITY OF SUCTION CONTROLS AND LIQUID OXYGEN GAUGE, FLAMES, SMOKE AND FUMES IN ACFT. WHEN DISCOVERED: IN FLIGHT, CAUSE OF INCIDENT COME FROM THE 120 VOLT AC OUTLET WIRE NR XMO10B12, PN M22759/16/12 WHICH IS LOCATED ON THE LT OVERHEAD CABINET AFT END. THE WIRE APPEARED TO HAVE CHAFED AND ARCED, TO THE VACUUM PUMP PUSH BUTTON SWITCH BODY PN 95-42-14. THIS SWITCH IS INSTALLED THRU THE COMPOSITE (KEVLAR) CABINET FRONT FACE. THE SWITCH BODY CUTOUT PROBABLY HAD ENOUGH FIBERS TO IGNITE A FLAME. IT BURNED THE FRONT FACE OF CABINET, AND THE VACUUM GAGE AND REGULATOR KNOB. C/A WILL BE TO REPAIR KEVLAR CABINET, REPLACE VACUUM PUMP SWITCH ASSY, REPLACE WIRE PN XMO10B12 AND VACUUM REGULATOR ASSY.