Hydraulics

Question 1

What pressure in psi does the rat provide?

Answer 1

2500

Question 2

What causes the rat to auto extend?

Answer 2

G & Y and G & B hydraulics low pressure

Question 3

What’s the function of the priority valve?

Answer 3

In case of low hydraulic pressure, it cuts off heavy load users to protect brakes and flight controls

Question 4

What pressurizes the hydraulic reservoirs?

Answer 4

HP bleed air from eng 1

Question 5

When does the Green elec pump turn on automatically?

Answer 5

When single engine, when l/g selected up, the green elec pump turn on for 25s to make sure the gear retracts quick enough.

Question 6

What operates the hydraulic system shutoff valves, and where are they?

Answer 6

HSMU, upstream of each engine pump

Question 7

What causes the blue elec pump to run and why?

Answer 7

It runs in case of engine failure, AND prim 1 or 3 fault. It ensures enough rudder authority to counter yaw sideslip caused by asymmetric thrust.

Question 8

What causes yellow elec pump to run and why?

Answer 8

If engine 2 fails, if flaps lever not at zero, it will power automatically