Which of the following is a component of the UH-60S engine control system?

Which of the following is a component of the UH-60S engine control system?

• A. HMU
• B. GPS Receiver
• C. VHF Transceiver
• D. Cabin Pressure Controller

Answer: (A)

The important idea here is how the UH-60S controls engine operation. The Hydromechanical Unit (HMU) is the part of the engine control system that actually meters fuel and governs engine speed. It takes electronic commands from the FADEC and converts them into hydraulic control of the fuel metering valve, which adjusts fuel flow to the T700 engine. This combination of electronic command and hydraulic metering keeps the engine responding correctly to throttle and stability needs, starting, and steady operation. The other items—GPS receiver, VHF transceiver, and cabin pressure controller—belong to navigation/communications and environmental control systems, not to the engine control system.

The important idea here is how the UH-60S controls engine operation. The Hydromechanical Unit (HMU) is the part of the engine control system that actually meters fuel and governs engine speed. It takes electronic commands from the FADEC and converts them into hydraulic control of the fuel metering valve, which adjusts fuel flow to the T700 engine. This combination of electronic command and hydraulic metering keeps the engine responding correctly to throttle and stability needs, starting, and steady operation.

The other items—GPS receiver, VHF transceiver, and cabin pressure controller—belong to navigation/communications and environmental control systems, not to the engine control system.