Air Canada Flight 797 5
Air Canada Flight 797 5 : (2) NTSB Investigation: Nearly four years earlier, on September 17, 1979, the plane, then serving as Air Canada Flight 680 (Boston, Massachusetts to Yarmouth, Nova Scotia), had suffered an explosive decompression in the rear bulkhead that required rebuilding the tail section and replacing or splicing most of the wiring and hydraulic lines in the back of the plane; Cameron noted in an interview for the "Fire Flight" episode of Mayday that the Air Canada maintenance crew "did a heck of a job getting everything put back together" after the decompression incident. Investigators were unable to find signs of arcing in any of the wire splices from the repairs done four years earlier, though much of the wiring in the rear of the plane was severely damaged or destroyed by the fire itself. Despite finding neither the specific wires that caused the short circuit (the usual cause of arcing sounds and the likely cause of the breaker trips) nor the origin point of the fire that later consumed the plane, investigators determined that a short circuit likely sparked and ignited surrounding materials (such as insulation blankets) that sustained and propagated a fire that burned behind the wall of the lavatory, with the plane's outer skin serving as a conduit for smoke to seep in through the seams in the interior panels and collect near the apex of the cabin
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