Which hydraulic pump pressurizes the 2nd stage primary servos and pilot assist module?

Which hydraulic pump pressurizes the 2nd stage primary servos and pilot assist module?

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

Answer: (A)

In the UH-60 hydraulic system, two engine-driven pumps feed the flight-control hydraulics, with each pump powering different parts of the servo network. The pump designated No. 2 is the one that pressurizes the circuit for the second-stage primary servos and the pilot assist module. This arrangement ensures the critical secondary servos and the PAM have a dedicated pressure source, especially under high-demand conditions, while the No. 1 pump handles other portions of the primary servos. The back-up pump and APU pump are available only as alternatives during faults or when engines aren’t providing power. So, the pump that pressurizes the 2nd stage primary servos and pilot assist module is the No. 2 hydraulic pump.

In the UH-60 hydraulic system, two engine-driven pumps feed the flight-control hydraulics, with each pump powering different parts of the servo network. The pump designated No. 2 is the one that pressurizes the circuit for the second-stage primary servos and the pilot assist module. This arrangement ensures the critical secondary servos and the PAM have a dedicated pressure source, especially under high-demand conditions, while the No. 1 pump handles other portions of the primary servos. The back-up pump and APU pump are available only as alternatives during faults or when engines aren’t providing power. So, the pump that pressurizes the 2nd stage primary servos and pilot assist module is the No. 2 hydraulic pump.