Hydraulic

Question 1

How many hydraulic systems are on the airplane?

Answer 1

3 Independent systems

Question 2

At what pressure does the hydraulic system normally operate?

Answer 2

3000 psi

Question 3

Each hydraulic system has how many pumps?

Answer 3

2. (A) main pump and a backup pump (B).

Question 4

What pumps are AC driven? (ACMP)

Answer 4

System 3 main pump is an AC motor pump and is designated as 3A. All of the backup pumps are ACMP’s and are designated as 1B, 2B and 3B.

Question 5

With the hydraulic switches in the AUTO position, the 1B and 2B pumps automatically start when?

Answer 5

Respective bus is powered, the associated engine-driven generator is operating, and the flaps are not at zero (flap position is greater that 4°)

Question 6

What color is a non-powered component on the hydraulic synoptic page?

Answer 6

A non-powered component is amber in color.

Question 7

What component ensures that hydraulic pressure is supplied to the flight controls if hydraulic system 3 pressure becomes too low?

Answer 7

To ensure priority to the primary flight controls a priority valve cuts off hydraulic system 3 pressure to the landing gear selector valves if hydraulic system 3 pressure drops too low.