What is the purpose of a turbine engine's fuel control unit?

• A. Regulates the engine oil pressure to protect the engine.
• B. Monitors airframe temperature.
• C. Regulates the amount of fuel delivered to match thrust and speed demands.
• D. Maintains electrical power for avionics.

Answer: (C)

The fuel control unit’s role is to meter the fuel delivered to the combustion chamber based on what thrust or speed is being requested and the engine’s current state. It converts throttle input into a precise fuel flow, maintaining the correct fuel–air ratio across all operating conditions. By using signals from engine speed sensors, pressures, and temperatures, it adjusts fuel delivery to achieve the commanded thrust while staying within safety limits, preventing conditions like compressor surge or excessive turbine temperature. This coordination enables smooth acceleration, stable idle, efficient cruise, and proper shutdown. Other systems regulate oil pressure, monitor airframe temperature, or provide electrical power, but those duties aren’t the fuel metering function.