What does the number 2 hydraulic pump pressurize?

What does the number 2 hydraulic pump pressurize?

• A. 1st stage primary servos
• B. 2nd stage primary servos and pilot assist module
• C. Tail rotor only
• D. APU

Answer: (B)

The helicopter’s hydraulic system uses two pumps that feed different parts of the flight-control actuators. The number two pump is dedicated to pressurizing the second-stage primary servos and the pilot assist module, providing the additional hydraulic power needed for final actuation and stability augmentation. The first-stage primary servos are powered by the other pump, and the tail rotor and APU aren’t served by this second pump in normal operation. So, the number two pump pressurizes the second-stage primary servos and the pilot assist module.

The helicopter’s hydraulic system uses two pumps that feed different parts of the flight-control actuators. The number two pump is dedicated to pressurizing the second-stage primary servos and the pilot assist module, providing the additional hydraulic power needed for final actuation and stability augmentation. The first-stage primary servos are powered by the other pump, and the tail rotor and APU aren’t served by this second pump in normal operation. So, the number two pump pressurizes the second-stage primary servos and the pilot assist module.