FMS = flight management system. Jag citerar från 737NG-manualen: The FMS is comprised of the following components: - flight management computer system (FMCS) , - autopilot/flight director system (AFDS), - autothrottle (A/T), -inertial reference systems (IRS), - global positioning systems (GPS). Each of these componenets is an independent system and each can be used independently or in various combinations. The term FMS refers to the concept of joining these independent components together into one integrated system which provides continous automatic navigation, guidance and performance management.