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Airbus 320 > Hydraulics > Flashcards

Hydraulics Flashcards

1
Q

What are the three hydraulic systems?

A

Green, Blue and Yellow

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2
Q

Which hydraulic systems have fire shut-off valves?

A

Green and Yellow

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3
Q

Can fluid be transferred between systems?

A

No

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4
Q

What is the normal system operating pressure?

A

3000 psi (+/-200)

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5
Q

What is the RAT operating pressure?

A

2500 psi

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6
Q

Which systems have electric hydraulic pumps?

A

Blue and Yellow systems

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7
Q

What is the significance of an Engine Hydraulic pump FAULT light?

A
  • Reservoir low qty
  • Reservoir overheat
  • Reservoir low air pressure
  • Low pump pressure
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8
Q

When is the FAULT light inhibited on the Engine Hydraulic pump?

A

On the ground with the engine shut down

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9
Q

Will switching pump OFF extinguish the FAULT light?

A

Yes, except reservoir overheat which will remain as long as condition exists.

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10
Q

When does the blue electric pump operate?

A
  • In flight with AC power available

- On ground with AC power available and with one engine running

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11
Q

Which additional fault will trigger FAULT light on the blue system electric pump?

A

Pump overheat

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12
Q

When does the PTU operate in the air?

A

When the pressure difference between green and yellow systems >500 psi

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13
Q

Which system is powered by the PTU?

A

PTU is bidirectional, powers both green and yellow from the opposite system

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14
Q

Which condition will generate a PTU FAULT light?

A

Green or yellow system:

  • Reservoir low quantity
  • Reservoir overheat
  • Reservoir low air pressure
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15
Q

When is the PTU inhibited?

A
  • During 1st engine start

- When yellow electric pump is used for cargo operations

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16
Q

When is the RAT deployed?

A
  • Loss of AC bus 1 and 2 in flight

- Airspeed >100kts

17
Q

How many accumulators are installed?

A
  1. One per system
18
Q

What is the purpose of the priority valves?

A

Preserves hydraulic power for flight controls in case of low system pressure

19
Q

Which hydraulic system powers the normal brakes?

A

Green

20
Q

Which hydraulic system powers the alternate brakes?

A

Yellow

21
Q

Which hydraulic system powers the landing gear?

A

Green

22
Q

Which hydraulic system powers the Nosewheel Steering?

A

Yellow

23
Q

Which hydraulic system powers the slats?

A

Green and blue

24
Q

Which hydraulic system powers the flaps?

A

Green and yellow

25
Q

How are the reservoirs pressurized?

A

Using bleed air from engine 1 or cross bleed duct

26
Q

When does the PTU operate on the ground?

A
  • Green/Yellow diff pressure >500psi, and
  • Both engine master switches ON or OFF, or
  • Parking brake released

Airbus 320 (15 decks)

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