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A330/350 Systems > A330 Hydraulics > Flashcards

A330 Hydraulics Flashcards

1
Q

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

A
  • 3

- Green, Blue, Yellow

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2
Q

What is the normal operating pressure of the hydraulic system?

A

3000 psi (+/-200psi)

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3
Q

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

A

2500psi

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4
Q

How many hydraulic reservoirs does the A330 have?

A
  • 3

- one for each hydraulic system

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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)
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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.

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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.

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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.

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9
Q

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

A

Yellow hydraulic system (elec pump)

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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
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11
Q

At what flow rate do the electric pumps flow?

A

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

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12
Q

Which system does the RAT pressurize?

A

Green hydraulic system

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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
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14
Q

At what flow rate does the RAT provide hydraulic pressure?

A

15-45% of the eng driven pumps.

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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

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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.

A330/350 Systems (8 decks)

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