Before revision: 250px|Example of a FMS Control Display Unit used on a Boeing 737-300 Flight management systems which became popular in the mid-1980's , automate a wide variety of in-flight tasks previously performed by a human, thereby reducing the workload on the light crew A flight management system (FMS) is a fundamental component of a modern airliner's avionics.
After revision: 250px|Example of a FMS Control Display Unit used on a Boeing 737-300 Flight management systems which became popular in the mid-1980's automate a wide variety of in-flight tasks previously performed by a human, thereby reducing the workload on the light crew A flight management system (FMS) is a fundamental component of a modern airliner's avionics.