[CivilWarBrewing]

"below the floor of the cockpit"

Some of these aircraft have equipment rooms people can stand up in. Are these rooms checked for stowaways or terrorists before the plane departs?

Also, this COULD HAVE been a low yield explosive that tore a hole in the side of the aircraft which would give enough time for an error code to be transmitted. This could have been a bomb, not JUST a 'mechanical fire'.

[VTenigma]

Also, this COULD HAVE been a low yield explosive that tore a hole in the side of the aircraft which would give enough time for an error code to be transmitted. This could have been a bomb, not JUST a ‘mechanical fire’.

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^^^^^ This. All the smoke alerts only 3 seconds apart and then no mayday. It happened awfully fast for it to be mechanical in nature.

[Mr. Jeeves]

Also, this COULD HAVE been a low yield explosive that tore a hole in the side of the aircraft which would give enough time for an error code to be transmitted.

Sure, a pressure-triggered bomb in the baggage compartment. Automatically armed at cruising altitude, detonated by rising pressure when they started descending into Cairo.