A flight management system (FMS) is a fundamental component of a modern airliner’s avionics. An FMS is a specialized computer system that automates a wide variety of in-flight tasks, reducing the workload on the flight crew to the point that modern aircraft no longer carry flight engineers or navigators. A primary function is in-flight management of the flight plan. Using various sensors to determine the aircraft’s position, the FMS can guide the aircraft along the flight plan.
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