MMU outputs are proportional to which rotor systems?

• A. Main rotor and tail rotor
• B. Main rotor only
• C. Tail rotor only
• D. Neither rotor

Answer: (A)

In the UH-60, the Mission Management Unit translates pilot inputs into control signals for both rotor systems, and those signals are scaled so that both the main rotor and the tail rotor respond proportionally. The main rotor provides lift and attitude control through cyclic and collective, while the tail rotor supplies anti-torque and yaw control. To maintain stable flight and coordinated maneuvers, the MMU adjusts signals to increase main rotor lift and engine power as you raise collective, while simultaneously adjusting tail rotor thrust in proportion to the main rotor’s torque so yaw remains predictable. This coordinated, proportional control is essential for smooth, controllable flight, which is why outputs come from both rotor systems.