Which component serves as the engine metering unit in the UH-60S fuel system?

Which component serves as the engine metering unit in the UH-60S fuel system?

• A. Engine Driven Boost Pump
• B. Liquid to Liquid Cooler
• C. Overspeed and Drain Valve
• D. HMU

Answer: (D)

The fuel metering for the UH-60S engine is handled by the Hydromechanical Unit (HMU). This component is designed to regulate exactly how much fuel is delivered to the engine’s injectors in response to pilot demand and engine conditions. It translates throttle input and sensor data into a precise metered fuel flow, maintaining the correct fuel-air mixture and engine speed across a range of operating conditions. Understanding the other parts helps see why the HMU is the metering unit: the Engine Driven Boost Pump provides the high-pressure fuel supply and motive flow needed by the system, not the metering action itself; the Liquid to Liquid Cooler simply removes heat from the fuel to keep it within acceptable viscosity and pressure characteristics; and the Overspeed and Drain Valve handles safety and fuel draining, not normal metering. The HMU is the component that actually meters the fuel to the engine.

The fuel metering for the UH-60S engine is handled by the Hydromechanical Unit (HMU). This component is designed to regulate exactly how much fuel is delivered to the engine’s injectors in response to pilot demand and engine conditions. It translates throttle input and sensor data into a precise metered fuel flow, maintaining the correct fuel-air mixture and engine speed across a range of operating conditions.

Understanding the other parts helps see why the HMU is the metering unit: the Engine Driven Boost Pump provides the high-pressure fuel supply and motive flow needed by the system, not the metering action itself; the Liquid to Liquid Cooler simply removes heat from the fuel to keep it within acceptable viscosity and pressure characteristics; and the Overspeed and Drain Valve handles safety and fuel draining, not normal metering. The HMU is the component that actually meters the fuel to the engine.