Hydraulics

Question 1

How many EDP:s are there?

Answer 1

One in SYS 1
One in sys 2

Question 2

What type of flight controls are fed by Hydraulic System 3?

Answer 2

Primary Flight Controls

Question 3

Is the Power Transfer Unit active on ground?

Answer 3

No

Question 4

Which of the hydraulic reservoirs has a bigger capacity?

Answer 4

Sys 2
Due to landing gear needing more volume.

Question 5

Which two hydraulic systems might lead returning fluid to a heat exchanger?

Answer 5

Sys 1 and 2

Question 6

What is the purpose of the PUV Pump Unloader Valve?

Answer 6

Used in electrical emergency to avoid overloading RAT.
Reducing discharge pressure of ACMP 3A

Question 7

What is the temperature ?
HYD 1 HI TEMP

Answer 7

100 degrees C

Question 8

What happens in hyd sys 1 if the temperature reaches 125 degrees C in the reservoir?

Answer 8

SOV closes automatically

Question 9

What is the temperature when you get the following warning?

HYD 1 OVERHEAT

And what is a manual countermeasure you can do?

Answer 9

145 degrees C

You can press the guarded ENG PUMP SHUT-OFF button

Question 10

In case of engine failure:
What happens with respective EDP?

Answer 10

FADEC unloads respective EDP.

Reason is to facilitate a windmilling start reducing torque loads on engine.