Which hydraulic pump pressurizes the 1st stage primary servos and 1st stage tail rotary servo?

Which hydraulic pump pressurizes the 1st stage primary servos and 1st stage tail rotary servo?

• A. Number 2 hydraulic pump
• B. Back up pump
• C. Number 1 hydraulic pump
• D. APU

Answer: (C)

The primary flight-control servos, including the first-stage primary servos and the first-stage tail rotor servo, are powered by the engine-driven pump that feeds the primary hydraulic system. This pump supplies the high-pressure fluid necessary for the main control actuators, giving the pilot the direct, immediate control over the rotor systems. The other pump handles the secondary circuits, and the backup pump or APU is not used to pressurize these primary servos during normal operation.

The primary flight-control servos, including the first-stage primary servos and the first-stage tail rotor servo, are powered by the engine-driven pump that feeds the primary hydraulic system. This pump supplies the high-pressure fluid necessary for the main control actuators, giving the pilot the direct, immediate control over the rotor systems. The other pump handles the secondary circuits, and the backup pump or APU is not used to pressurize these primary servos during normal operation.