29 - Hydraulics

Question 1

What is the normal operating pressure of the hydraulics?

Answer 1

3000 PSI

2500 when powered by the RAT

Question 2

Which pump pressurises the green system?

Answer 2

Engine 1 pump

Question 3

Which pump pressurises the blue system?

Answer 3

Electric pump

RAT in an emergency

Question 4

Which pumps (3) pressurise the yellow system?

Answer 4

Engine 2 pump

Electric pump also exists for the yellow system on the ground when engines are stopped

Hand pump for yellow system also

Question 5

When does the PTU operate?

Answer 5

When the differential pressure between the green and yellow is greater than 500PSI

Question 6

When does the RAT automatically deploy?

Answer 6

When AC BUS 1 and AC BUS 2 have failed

Question 7

Where are the shutoff valves for the green and yellow system?

Answer 7

Upstream of the pump

Question 8

What air pressurises the hydraulic reservoirs normally?

Answer 8

HP Bleed air from engine 1

If air is low it takes it from the cross bleed duct.

Question 9

When does the blue pump operate?

Answer 9

In flight if AC power available

If the pb is pushed on maintenance panel

Question 10

When is the PTU inhibited?

Answer 10

During the first engine start

Question 11

What does pressing the Yellow pump on for single engine taxi do?

Answer 11

Pressurises the yellow system without using the PTU

Question 12

Which systems have accumulators?

Answer 12

All three!

Question 13

When does the pressure go amber on the ECAM page?

Answer 13

<1450PSI

Question 14

Why are the hydraulic reservoirs pressurised?

Answer 14

Prevents them from cavitation.

Question 15

What does the circle below the square represent on the ECAM hydraulics page?

Answer 15

Fire shutoff valves

Question 16

Which thrust hydraulics system controls which reversers?

Answer 16

Green controls eng 1

Yellow controls eng 2

Question 17

What systems do you lose with the loss of green hyd fluid?

Answer 17

Reverser 1
Normal braking
Slats and flaps slow
Autobrake
Landing gear retract

Question 18

What happens to landing capability following any hydraulic loss?

Answer 18

You lose CAT 3 Dual

Question 19

What systems do you lose if you have a yellow hyd low level?

Answer 19

Reverser 2
N/W steering
Cargo doors
Flaps slow

Question 20

What is the approximate factored landing distance with a Green and Yellow hydraulics failure?

Answer 20

2900m