What are the three components of the EEC system?

• A. Hydromechanical fuel control, electronic fuel control unit, and throttle position sensor.
• B. Hydromechanical fuel control, electronic fuel control unit, and power lever angle potentiometer.
• C. Electronic fuel control unit, power lever angle potentiometer, and throttle position sensor.
• D. Hydromechanical fuel control, throttle position sensor, and power lever angle potentiometer.

Answer: (C)

An Electronic Engine Control (EEC) system uses three critical parts: the electronic fuel control unit, the power lever angle potentiometer, and the throttle position sensor. The electronic fuel control unit acts as the brain, calculating the required fuel flow by processing signals from sensors and the commanded lever position. The power lever angle potentiometer tells the EEC how far the power lever is advanced, indicating how much fuel is being requested. The throttle position sensor provides the actual position of the throttle valve, relating to the amount of air entering the engine. Together, these inputs let the EEC schedule fuel precisely to meet demand across engine speeds and loads. If any of these are missing, the EEC cannot correctly meter fuel. Other options mix in a hydromechanical control or replace an electronic input with something not used in the EEC, so they don’t fit.