Part 3/8:
As the strange smell wafted through the cockpit, both pilots initially brushed it off as a possible air conditioning issue. However, shortly afterward, wisps of smoke appeared from the ceiling, intensifying their concern. Upon investigation, they dismissed the issue, failing to realize that a fire had ignited in the space above the cockpit. The culprit was electrical arcing from the wires powering the in-flight entertainment system, igniting thermal insulation material.
Despite being aware of issues with overheating related to this system, Swissair had decided to proceed with its installation in their aircraft. Unbeknownst to them, this decision would have dire consequences.