Loss of both the #2 hydraulic pump and the backup pump would result in the loss of which tail rotor servos?

• A. 2nd primary servos and the pilot assist servos
• B. 1st stage primary servos
• C. Yaw boost servo
• D. Tail rotor cables

Answer: (A)

In the UH-60S tail rotor control system, hydraulic power drives multiple servo actuators that translate pedal input into tail rotor pitch. The second-stage primary servos and the pilot assist servos rely on the #2 hydraulic pump and the backup pump for pressure. If both of those pumps fail, those particular servos lose hydraulic pressure and can no longer move, so their authority is lost. The first-stage primary servos, which are powered by the #1 pump, would still have pressure and remain functional. The yaw boost servo is part of a different path, and the tail rotor cables are just mechanical linkages, not hydraulically driven, so they’re not “lost” by the pump failures. That’s why the correct result is loss of the 2nd primary servos and the pilot assist servos.