Definition
An electronic engine control system that uses a digital computer to manage all aspects of engine operation, including fuel flow, ignition timing, and (where applicable) propeller pitch, based on inputs from sensors and the pilot's power lever. It has 'full authority' because it controls the engine throughout its entire operating range without requiring manual mixture, propeller, or ignition adjustments by the pilot.
Plain English
A computer that runs the engine for the pilot. The pilot moves a single power lever, and the system handles fuel, spark, and other settings automatically across all phases of flight.
Context Anchor
Seen in aircraft with digitally controlled engines, especially during engine start, power changes, engine checks, and abnormal engine procedures.
Derivation
Full Authority' means the system has complete control over the engine — there is no manual backup lever for mixture or prop. 'Digital' refers to the use of a computer rather than mechanical or analog controls. Together: a computer with total say over how the engine runs.
Why Pilots Care
It reduces pilot workload, improves engine efficiency and reliability, and prevents operation outside safe limits.
Intuition Check
FADEC does not mean the engine flies the airplane or removes pilot responsibility. It manages engine operation; the pilot still commands power, monitors the engine, and follows the aircraft procedures.
Example Sentence 1
Because the aircraft is equipped with FADEC, the pilot only needs to set the power lever; the system manages fuel flow and propeller pitch automatically.
Example Sentence 2
During preflight the pilot checked the FADEC status on the engine display before starting.