# A330 Hydraulics Flashcards

1
Q

How many hydraulic systems does the A330 have? What are they?

A
• 3

- Green, Blue, Yellow

2
Q

What is the normal operating pressure of the hydraulic system?

A

3000 psi (+/-200psi)

3
Q

When the RAT pressurizes the hydraulic system, how much pressure does it hold?

A

2500psi

4
Q

How many hydraulic reservoirs does the A330 have?

A
• 3

- one for each hydraulic system

5
Q

How many pumps run each hydraulic system?

A
• 4 Green, (2 eng driven pumps, 1 elec, 1 RAT)
• 2 Blue, (1 eng (L) driven pump, 1 elec)
• 3 Yellow, (1eng (R) driven pump, 1 elec, 1 hand)
6
Q

What happens if one engine is failed and the ldg gear is selected up?

A

The green elec pump runs for 25sec to ensure gear retraction in a proper time.

7
Q

When the RAT pressurizes the green hydraulic system what happens to the aileron, elevator and spoiler servo controls?

A

They run at a reduced speed.

8
Q

When one engine is failed and either the PRIM 1 or PRIM 3 is failed, what does the blue hydraulic system do?

A

The blue electric pump runs to ensure sufficient pressure on the electrical rudder.

9
Q

Which hydraulic system is used for ground operations? (cargo doors)

A

Yellow hydraulic system (elec pump)

10
Q

When do the yellow electric pumps run automatically?

A
• In the event of eng 2 failure and flap not at 0 (to ensure flap retraction)
• When the cargo door is operated
11
Q

At what flow rate do the electric pumps flow?

A

18% of the engine driven pumps (slow surface retraction)

12
Q

Which system does the RAT pressurize?

A

Green hydraulic system

13
Q

When does the RAT deploy?

A
• When the RAT MAN ON pb in pressed or
• Dual engine failure (automatically, N3<50%)or
• Low lvl in G/Y or G/B reservoir
14
Q

At what flow rate does the RAT provide hydraulic pressure?

A

15-45% of the eng driven pumps.

15
Q

How many system accumulators are there and what is their purpose?

A
• 3, one for each hydraulic system (G/B/Y)

- maintain constant pressure in the system

16
Q

How are the fire shutoff valves closed?

A

By pressing the FIRE pb on the overhead panel

17
Q

Can the fire shutoff valves be opened once they have been automatically closed?

A

No

18
Q

How are the hydraulic reservoirs pressurized?

A
• By using HP from engine 1
• Ground air supply
• APU bleed valve
• Cross bleed duct
19
Q

How are the hydraulic reservoirs pressurized if engine bleed 1 is too low?

A

By using bleed air from the crossbleed duct.

20
Q

Why are the hydraulic reservoirs pressurized?

A

To prevent the pumps from cavitating.

21
Q

What does HSMU stand for?

A

Hydraulic System Monitoring Unit

22
Q

Which hydraulic system does the park brake get it’s pressure from?

A

Blue (Eng 1)

23
Q

Which hydraulic system do the cargo doors get their pressure from?

A

Yellow (Eng 2)

24
Q

Can the leak measurement valves be closed in flight?

A

No, the HSMU inhibits this in flight once aircraft speed is above 100kts.

25
Q

What is the priority valve used for?

A

It is used to cut hydraulic power to some heavy users (emer gen., NWS, LDG) in order to keep the pressure for normal braking and flight controls when there is a low pressure in the hydraulic system.

26
Q

When does the fault light come on on the ENG 1(2) PUMP pb?

A
• Reservoir lvl is low
• Reservoir overheats (light stays on until cool)
• Air pressure in reservoir is low
• Pump pressure is low
27
Q

When does the fault light come on on the GREEN (YELLOW) ELEC PUMP pb?

A
• Reservoir low lvl
• Reservoir overheat
• Reservoir air pressure low (light stays on until cool)
• Pump low pressure
• Pump overheat (light stays on until reset on ground)
28
Q

You’re on the ground and see the YELLOW ‘OFF’ light illuminate on the Leak Measurement Valve panel. What does this mean?

A

The YELLOW leak measurement valve has automatically closed due cargo door operations to prevent inadvertent movement of the flight control surfaces.

29
Q

When one of the leak measurement valves is pressed in flight, will the valves close?

What happens if the aircraft lands?

A
• No, they are automatically prohibited from closing above 100kts.
• Once on the ground (below 100kts) the leak measurement valve will close cutting hydraulic pressure to flight control surfaces.