The FADEC controls which unit that regulates fuel flow to the engines?

The FADEC controls which unit that regulates fuel flow to the engines?

• A. Hydraulic Pump
• B. Electric Starter
• C. Throttle Controller
• D. Fuel Metering Unit (FMU)

Answer: (D)

Fuel flow regulation in an FADEC-controlled engine is managed by the Fuel Metering Unit. The FADEC acts as the brain, computing the required fuel flow from inputs like engine speed, air flow, altitude, and thrust request, and then sending commands to the FMU to meter the correct amount of fuel to the combustor. The FMU contains the metering components—valves and servos—that actually control how much fuel is delivered to the fuel nozzle, so it is the unit that directly regulates fuel flow. Other components listed don’t set fuel flow: the hydraulic pump provides hydraulic power, not fuel metering; the electric starter is used to spin the engine up during start; the throttle lever signal is interpreted by the FADEC to determine desired thrust, but the actual fuel metering is still done by the FMU under FADEC control.

Fuel flow regulation in an FADEC-controlled engine is managed by the Fuel Metering Unit. The FADEC acts as the brain, computing the required fuel flow from inputs like engine speed, air flow, altitude, and thrust request, and then sending commands to the FMU to meter the correct amount of fuel to the combustor. The FMU contains the metering components—valves and servos—that actually control how much fuel is delivered to the fuel nozzle, so it is the unit that directly regulates fuel flow.

Other components listed don’t set fuel flow: the hydraulic pump provides hydraulic power, not fuel metering; the electric starter is used to spin the engine up during start; the throttle lever signal is interpreted by the FADEC to determine desired thrust, but the actual fuel metering is still done by the FMU under FADEC control.