In turbine fuel control systems, which type is most accurate?

• A. Electronically controlled fuel control
• B. Hydromechanical fuel control
• C. Pneumatic metering control
• D. Manual lever metering

Answer: (A)

Electronic control is the most accurate because it uses sensors and a digital controller to continuously measure engine conditions and command fuel flow with real-time compensation. This closed-loop approach minimizes errors from wear, hysteresis, and mechanical play, delivering precise, repeatable metering across all operating ranges. Hydromechanical and pneumatic systems rely on hydraulic or air pressure signals with mechanical linkages, which introduce lag, tolerances, and wear that reduce precision. Manual lever metering depends on the operator’s feel and lacks automatic correction for changing conditions. In short, the ability to continually sense, compute, and adjust fuel flow makes electronically controlled fuel control the most accurate choice.