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A320 > Hydraulics > Flashcards

Hydraulics Flashcards

1
Q

How many hydraulic systems does the A320 have and what are they?

A
  • 3 systems
  • green blue and yellow
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2
Q

What is the hydraulic system pressure?

A

3000 psi

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3
Q

How is normal hydraulic pressure produced

A

Engine driven hydraulic pumps

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4
Q

How can back up hydraulic pressure be produced?

A
  • electrically driven hydraulic pressure pumps (Y/B only)
  • Power transfer unit (PTU) (G/Y only)
  • ram at turbine (RAT) (blue)
  • hand pump (yellow)
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5
Q

How many accumulators are installed and what are they used for?

A
  • 3 accumulators one for each hydraulic system
  • They help maintain a constant pressure during transient demands
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6
Q

How many engine driven hydraulic pumps are there?

A
  • 2
  • One for the green hydraulic system
  • One for the yellow hydraulic system
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7
Q

How many electric driven hydraulic pumps are there?

A
  • 2
  • One for the blue hydraulic
  • One for the yellow hydraulic system
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8
Q

The flaps controlled by which hydraulic system?

A

Yellow and green

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9
Q

Nosewheel steering and landing gear are controlled by which hydraulic system

A

Green

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10
Q

The slats are controlled by which hydraulic system?

A

Blue and green

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11
Q

The parking brake is controlled by which hydraulic system?

A

Yellow 

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12
Q

The cargo doors are controlled by which hydraulic system?

A

Yellow

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13
Q

The emergency generator is powered by which hydraulic system?

A

Blue

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14
Q

How is the blue hydraulic system pressurized?

A

Single electric pump when engine is running

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15
Q

If the blue hydraulic electric pump fails, how can the blue hydraulic system be pressurized?

A

Via the ram air turbine (RAT)

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16
Q

Why are the hydraulic reservoirs pressurized?

A

To prevent pump cavitation

17
Q

If the yellow engine driven pump fails, what happens to the electric pump

A

It does not automatically activate. Pilots need to push the yellow electric pump on.

18
Q

When does the yellow electric pump automatically operate?

A

When the cargo doors are operated

19
Q

When does the blue electric pump operate?

A
  • with AC power available
  • On the ground with one engine running
  • Continuously, in-flight, even if both engines are shut down
20
Q

When does the PTU activate?

A

Automatically, if a pressure difference of more than 500 psi exists between G and Y hydraulic systems.

21
Q

Does the PTU transfer hydraulic fluid?

A

No, it only transfers pressure but not hydraulic fluid

22
Q

When does the RAT automatically deploy?

A
  • when AC buses 1 and 2 fail
23
Q

Which systems does the RAT pressurize?

A
  • Blue hydraulic system
  • Emergency generator
24
Q

If you press the RAT MAN ON pb on the hydraulic overhead panel what happens?

A
  • RAT deploys
  • B hydraulic system is powered
  • The emergency generator is not powered
25
Q

If the MAN ON pb on the EMER ELEC PWR panel is pushed what happens?

A
  • RAT deploys
  • B hydraulic system is pressurized
  • Emergency generator is powered

A320 (32 decks)

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