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Frontier > A320 Hydraulics > Flashcards

A320 Hydraulics Flashcards

1
Q

What are the three hydraulic systems?

A

Green, blue, and yellow

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2
Q

What major components are operated via hydraulic power?

A

Flight controls, flaps and slats, landing gear, cargo doors, and the emergency generator

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3
Q

What is the normal hydraulic pressure provided by the engine driven hydraulic pumps?

A

3000 psi

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4
Q

What components can provide backup hydraulic pressure?

A

-Electrically driven hydraulic pumps (on the blue and yellow systems)
-A power transfer unit (PTU)
-A ram air turbine (RAT)
-A hand pump

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5
Q

What prevents hydraulic fluid from returning to the engine driven pump during an engine fire?

A

A hydraulic fire shutoff valve upstream from each engine driven pump

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6
Q

Which hydraulic systems have an associated acccumulator?

A

All 3, green, blue, and yellow.

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7
Q

What do the accumulators in each system do?

A

Help maintain a constant pressure during transient demands

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8
Q

What are some items powered by the green hydraulic system?

A

Landing gear*
Normal brakes*
Engine 1 reverser*
Slats/flaps
Other flight control components

  • ONLY powered by the green system
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9
Q

How is the nose wheel steering different for older vs newer A320’s?

A

It was originally on the green hydraulic system, but newer aircraft have it on the yellow system.

*I need to refer back to our operating manuals to know which aircraft of ours are configured in which way

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10
Q

How is the green system pressurized?

A

Normal pressure comes from a single engine driven pump powered by engine number 1. Backup pressure can be provided by the PTU.

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11
Q

What are some items powered by the yellow hydraulic system?

A

Nosewheel steering* 1
Alternate brakes*
Parking brake*
Engine #2 reverser*
Cargo doors*
Flaps
Other flight control components

*ONLY powered by the yellow system
1 On older aircraft the nosewheel steering may be powered by the green system

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12
Q

How can the yellow hydraulic system be pressurized?

A

-Via a single engine driven pump on engine #2
-Via an electric pump
-Via the PTU
-Via a hand pump, in order to open the cargo doors when the aircraft is unpowered on the ground

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13
Q

What are some items powered by the blue hydraulic system?

A

-The emergency generator*
-Slats
-Other flight control components

*only powered by the blue system

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14
Q

How can the blue system be pressurized?

A

-An electric pump
-A ram air turbine

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15
Q

Which systems have a fire shutoff valve?

A

Green and yellow

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16
Q

How can the fire shutoff valves be closed?

A

By pressing the ENG 1 FIRE and ENG 2 FIRE push buttons

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17
Q

What does it mean if the 1 or 2 indications on the hydraulic page turn from white to amber?

A

That the 1 or 2 engines respectively have shut down

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18
Q

If the green or yellow fire shutoff valves are closed, can the systems still be pressurized?

A

They can by the PTU. The hydraulic fire shutoff valve only keeps hydraulic fluid from flowing to the engine driven pump but not from flowing to the PTU.

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19
Q

What happens when the ENG 1 PUMP or ENG 2 PUMP push buttons on the overhead panel are pressed?

A

The respective engine driven pump is depressurized, OFF appears in white on the pushbutton, and the pump symbol changes to an amber dash on the hydraulics page.

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20
Q

What does the fault light on the ENG 1 PUMP or ENG 2 PUMP push buttons mean?

A

It means any of the following:
-Low pump output pressure
-Low reservoir quantity
-Reservoir fluid overheat
-Reservoir low air pressure

21
Q

Which systems have electric pumps?

A

Blue and yellow

22
Q

Will the yellow electric pump come on automatically if yellow system pressure is low?

A

No

23
Q

When will the yellow electric pump operate automatically? What is powered when it’s operated automatically?

A

Prior to engine start, when the cargo door is placed in either the open or closed position. When this occurs only the following are powered
-The cargo doors
-The alternate brake system
-The engine two thrust reverser

*the ON light in the yellow ELEC PUMP pushbutton will NOT illuminate when the pump is operated automatically

24
Q

When does the blue electric pump operate automatically?

A

If AC power is available:
-On the ground when at least one engine is running
-In flight, it operates continuously even if both engines are shut down

25
Q

When does the PTU become active?

A

Whenever the PTU pushbutton is in AUTO (lights out) and a differential pressure of at least 500 PSI is sensed between the yellow and green systems.

26
Q

What memo appears when the PTU is in operation?

A

HYD PTU is shown on the memo section of E/WD

27
Q

Does the PTU transfer fluid between the green and yellow systems?

A

No, just pressure

28
Q

Can the PTU output pressure meet all the demands of the respective systems operating requirements?

A

Yes!

29
Q

When does the PTU fault light come on?

A

For either the green or yellow systems:
-Fluid overheat
-Low air pressure
-Low fluid quantity

30
Q

When is the PTU inhibited?

A

-When the yellow systems electric pump is running due to cargo door operation
-During engine start, when the ENG MASTER switches are in opposing positions and either the nosewheel steering is disconnected, or the parking brake is on.

31
Q

When does the PTU perform a self test?

A

Momentarily during the second engine start

32
Q

When does the RAT deploy automatically in flight?

A

If both AC BUS 1 and 2 are unpowered, and airspeed is above 100 knots. The RAT does NOT automatically deploy for a loss of hydraulic pressure.

33
Q

Where is the RAT located?

A

Under the fuselage near the left wing root

34
Q

How does the RAT supply emergency power?

A

The RAT provides pressure to the blue hydraulic system. The blue hydraulic system then uses hydraulic pressure to run the emergency generator.

35
Q

What does the RAT MAN ON pushbutton on the hydraulics panel do?

A

It manually deploys the RAT to provide blue hydraulic pressure but does not cause the emergency generator to come on line.

36
Q

What does the EMER ELEC PWR MAN ON pushbutton on the EMER ELEC PWR panel do?

A

It manually deploys the RAT powering BOTH the blue hydraulic system, and the emergency generator.

37
Q

What message is displayed any time the RAT is extended?

A

RAT OUT is displayed in the memo section of the E/WD

38
Q

Once deployed, how can the RAT be stored?

A

Only by maintenance personnel

39
Q

Is the status of the hand pump displayed in the cockpit?

A

No

40
Q

When is the hand pump used?

A

Only when the aircraft is unpowered to provide yellow hydraulic pressure to open/close the cargo doors

41
Q

Can the aircraft be flown with a loss of all hydraulic systems?

A

No, you must have at least one

42
Q

What is the normal system hydraulic pressure?

A

3000 PSI

43
Q

If the accumulator pressure is low and an external walk around is to be completed, what should you do?

A

Obtain ground clearance, then turn on the yellow electric pump to pressurize the accumulator

44
Q

When is the PTU inhibited (version 2)?

A

-First engine start
-Parking brake is set and only one ENG MASTER switch is ON
-NWS in towing position and parking brake released
-Cargo door operation (PTU is also inhibited for 40 seconds after the end of cargo door operation)
-PTU pushbutton off

45
Q

If the ECAM actions lead you to turn off the PTU for a reservoir overheat, will the fault light extinguish?

A

No, not until the overheat subsides

46
Q

If the FAULT light in the PTU pushbutton is ON, are there any other indications on the hydraulic panel?

A

Yes, the FAULT light will also be illuminated on the respective ENG PUMP pushbutton

47
Q

Can the yellow electric pump run the PTU?

A

Yes

48
Q

What is the function of the hydraulic priority valves?

A

It cuts hydraulic power to the slats, flaps, landing gear, and emergency generator if pressure drops below a predetermined value

Frontier (32 decks)

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