The tail rotor actuator is part of which hydraulic system?

• A. Number 2 hydraulic system
• B. Number 1 hydraulic system
• C. Hydraulic reservoir
• D. Hydraulic accumulator

Answer: (A)

Controlling tail rotor pitch relies on a servo actuator that uses hydraulic pressure to move the blades. To keep yaw control reliable, helicopters use two independent hydraulic circuits. The tail rotor actuator is connected to the second hydraulic system, which powers that control and other critical actuators, so it remains available even if the first system has a failure. The reservoir and accumulator are parts of the hydraulic system that store fluid or pressure; they don’t move the tail rotor themselves. So the tail rotor actuator belongs to the second hydraulic system.