The engine electronic control is the brain of the engine, inputs such as speed, temperature, pressure and pilot throttle are used to ensure the required fuel flow for the given set of inputs. The EEC also provides a wide range of diagnostics data to the engine and aircraft maintenance systems, for the Trent engine, 80% is for maintenance, 20% engine control. This is often called the FADEC (Full Authority Digital Engine Control).

FADEC
Input changes from the pilot's thrust levers in the cockpit are received by the FADEC which is converted into a fuel demand signal that is transmitted to the Fuel Metering Unit (FMU). This will then regulate the amount of fuel going to the engine.

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