HYD panel

Question 1

What are the three HYD systems called?

Answer 1

GREEN, BLUE, and YELLOW systems.

Question 2

How is each system powered?

Answer 2

• GREEN - engine driven
• BLUE - electrically driven
• YELLOW - engine or electrically driven

Question 3

When does the BLUE pump normally operate?

Answer 3

• after the first engine is started

Question 4

If the blue system lost pressure, how would pressure be restored?

Answer 4

The RAT must be deployed. It does not deploy automatically upon BLUE system loss of pressure, so it must be manually deployed with the RAT MAN ON pushbutton.

Question 5

What can be done to correct low ACUM PRESS indication?

Answer 5

On the ground, coordinate with personnel and turn on the beacon and YELLOW ELECTRICAL pump.

Question 6

With no HYD system power, how can the FWD CARGO door be opened?

Answer 6

By using the hand pump

Question 7

What causes the PTU to operate in if selected in AUTO?

Answer 7

• differential pressure of 500 psi between GREEN and YELLOW systems
• After first engine start and until second engine starts, unless inhibited

Question 8

When is PTU inhibited?

Answer 8

• On the ground with master switches split and either the nose wheel steering disconnected or the parking brake ON
• for 40 seconds after cargo door operate

Question 9

What are some users of the GREEN system?

Answer 9

• Landing gear
• ENG 1 thrust reverser
• Normal brakes
• Slats and flaps

Question 10

What are some user of the BLUE system?

Answer 10

• Emergency generator

- Slats

Question 11

What are some users of the YELLOW system?

Answer 11

• Flaps
• Alternate brakes
• Nosewheel steering

Question 12

What priority valves do in the HYD systems?

Answer 12

Removes hydraulic power from the heavy users and protects the flight controls

Question 13

What would cause a FAULT light in the ENG 1 pump?

Answer 13

• pump low pressure
• over temp in reservoir
• low air pressure in reservoir
• low quantity

Question 14

If the FAULT Light illuminated in the ENG 1 Pump, what would identify the specific reason for the FAULT?

Answer 14

ECAM will display the reason.