Which of the following is a component of the EEC system?

• A. Power lever angle potentiometer
• B. Throttle body
• C. Fuel injector nozzle
• D. Gravity feed reservoir

Answer: (A)

Understanding how an Electronic Engine Control (EEC) determines what the engine should do is key. The EEC needs a precise signal that represents the pilot’s commanded thrust, and the power lever angle potentiometer provides that direct input. As the power lever moves, the potentiometer changes its resistance (or voltage), sending a corresponding electrical signal to the EEC. The control unit uses this signal to decide how much fuel to metering and how to schedule ignition and other parameters to achieve the requested thrust.

The other items aren’t direct EEC input devices: the throttle body is simply the air passage that the throttle controls, the fuel injector nozzle is part of the fuel delivery hardware that the EEC commands but isn’t itself an input sensor, and the gravity feed reservoir is just a fuel storage component. So the power lever angle potentiometer is the component that ties the pilot’s throttle command directly to the EEC.