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Swissair 111

Printed page 248. PDF page 260.

Within the localized area where the fire most likely started, a wire arcing event is the only plausible ignition source. There were several wire bundles containing hundreds of wires, including the four IFEN PSU cables and 16 American Wire Gauge
Open final report at PDF page 260TSB A98H0003: In-flight fire leading to collision with water

Swissair 111

Printed page 222. PDF page 234.

unlikely in that the DCAS worked normally after communication had been re-established. The only other circumstance that would completely disable the communications system would be the simultaneous failure of all nine push-to-talk switches; this is considered unfeasible. There
Open final report at PDF page 234TSB A98H0003: In-flight fire leading to collision with water