Full Authority Digital Engine Control
|Term||Full Authority Digital Engine Control|
full authority digital engine control
full-authority digital electronic engine control
a system consisting of a digital computer and ancillary components that control an aircraft’s engine and propeller. First used in turbine-powered aircraft, and referred to as full authority digital electronic control, these sophisticated control systems are increasingly being used in piston powered aircraft.
Federal Aviation Administration (FAA)Pilot's Handbook of Aeronautical Knowledge (2008), Chapter 6 (Aircraft Systems) 
In a spark ignition reciprocating engine the FADEC uses speed, temperature, and pressure sensors to monitor the status of each cylinder. A digital computer calculates the ideal pulse for each injector and adjusts ignition timing as necessary to achieve optimal performance. In a compression ignition engine the FADEC operates similarly and performs all of the same functions, excluding those specifically related to the spark ignition process. (same source)