In the UH-60S control system, which device blends pilot input with trim adjustments before sending commands to the primary servos?

In the UH-60S control system, which device blends pilot input with trim adjustments before sending commands to the primary servos?

• A. Mixing unit
• B. No. 2 FCC
• C. Pilot assist servos
• D. Trim actuators

Answer: (A)

The main idea is that the system needs to combine what you want to do with the helicopter (your pilot inputs) and the adjustments set by trim into a single command stream that drives the helicopter’s actuators. The device that does this blending is the mixing unit. It takes signals from your cyclic and collective controls and adds the trim actuator commands, then passes the resulting blended signals to the primary servos that move the swashplate and control rotor tilt and lift. This way, trim changes automatically offset tendencies without requiring you to manually override them, and your control inputs always result in a coherent response. The other components have different roles. The No. 2 FCC is part of the flight-control computers that handle stabilization and control logic, but the actual summing of pilot input with trim happens in the mixing unit. Pilot assist servos help reduce the force you must apply but don’t perform the blending function, and trim actuators provide the trim signals that are fed into the mixing unit rather than doing the blending themselves.

The main idea is that the system needs to combine what you want to do with the helicopter (your pilot inputs) and the adjustments set by trim into a single command stream that drives the helicopter’s actuators. The device that does this blending is the mixing unit. It takes signals from your cyclic and collective controls and adds the trim actuator commands, then passes the resulting blended signals to the primary servos that move the swashplate and control rotor tilt and lift. This way, trim changes automatically offset tendencies without requiring you to manually override them, and your control inputs always result in a coherent response.

The other components have different roles. The No. 2 FCC is part of the flight-control computers that handle stabilization and control logic, but the actual summing of pilot input with trim happens in the mixing unit. Pilot assist servos help reduce the force you must apply but don’t perform the blending function, and trim actuators provide the trim signals that are fed into the mixing unit rather than doing the blending themselves.