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Not because he couldn’t fly the plane—the simulator sessions were going well—but because of the "box." The Flight Management and Guidance System (FMGS). It was the brain of the aircraft, a cryptic computer that demanded precise inputs in a specific sequence. One wrong scratchpad entry, one misplaced decimal point in the cost index, and the virtual plane would fly itself into a mountain or run out of fuel over the Atlantic. a320 fms trainer pro activation key free