What does the backup pump supply pressure to?

What does the backup pump supply pressure to?

• A. The #1 and #2 hydraulic systems, 2nd stage tail rotor servo, and APU accumulator
• B. The #1 and #2 hydraulic systems only
• C. The tail rotor servo and APU accumulator only
• D. The environmental control system

Answer: (A)

In an emergency, the backup hydraulic pump is there to keep the helicopter controllable when the primary, engine-driven pumps aren’t delivering pressure. It feeds pressure to the critical hydraulic pathways so you don’t lose flight control. It supplies pressure to both hydraulic systems so their actuators for the flight controls remain pressurized. It also powers the second stage of the tail rotor servo, which provides additional tail-rotor authority when needed, such as in high-load or low-speed situations. Finally, it charges and maintains pressure for the APU accumulator so the APU can start and be available to supply hydraulic pressure when required. The environmental control system isn’t driven by this backup pump, so it isn’t included in the backup-pump pressure path. That’s why the correct understanding is that the backup pump supplies the #1 and #2 hydraulic systems, the second-stage tail rotor servo, and the APU accumulator.

In an emergency, the backup hydraulic pump is there to keep the helicopter controllable when the primary, engine-driven pumps aren’t delivering pressure. It feeds pressure to the critical hydraulic pathways so you don’t lose flight control.

It supplies pressure to both hydraulic systems so their actuators for the flight controls remain pressurized. It also powers the second stage of the tail rotor servo, which provides additional tail-rotor authority when needed, such as in high-load or low-speed situations. Finally, it charges and maintains pressure for the APU accumulator so the APU can start and be available to supply hydraulic pressure when required.

The environmental control system isn’t driven by this backup pump, so it isn’t included in the backup-pump pressure path. That’s why the correct understanding is that the backup pump supplies the #1 and #2 hydraulic systems, the second-stage tail rotor servo, and the APU accumulator.