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4. Systems > Hydraulics > Flashcards

Hydraulics Flashcards

1
Q

How are the hydraulic reservoirs pressurized?

A

By bleed air

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2
Q

Why are the hydraulic reservoirs pressurized?

A

To prevent cavitation

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3
Q

What is the normal bleed air source for reservoir pressurization?

A

Engine 1 bleed air

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4
Q

If bleed air pressure gets low for hydraulic reservoir pressure, what will happen?

A

Bleed air will be taken from the cross bleed duct

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5
Q

What are the hydraulic reservoirs monitored for?

A

Low level
Low pressure
Overheat

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6
Q

How is the green system usually pressurized?

A

By engine driven 1 pump

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7
Q

How is the yellow system usually pressurized?

A

By the engine driven pump 2.

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8
Q

How is the blue system usually pressurized?

A

By an electric pump

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9
Q

Which electrical system drives the blue electric pump?

A

AC1

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10
Q

Which pumps may pressurize the yellow system?

A

Engine driven 2 pump
Electric pump
Hand pump
PTU

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11
Q

Which electric systems drive the Y electric pump?

A

AC2 and external power

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12
Q

What pressure do the engine driven pumps and electric pumps supply?

A

3000 PSI

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13
Q

What pressure does the PTU supply?

A

2500 PSI

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14
Q

When does the PTU activate?

A

Automatically when differential pressure between the two systems is greater than 500 PSI.

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15
Q

What does the PTU during the second engine start sequence?

A

A self test

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16
Q

What is the purpose of the priority valve?

A

To cut off heavy users (flaps, slats, gears, emergency generator) if system pressure gets too low to operate flight controls

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17
Q

What hydraulic system is used for normal braking?

A

Green

18
Q

What hydraulic system is used for alternate braking?

A

Yellow

19
Q

When does the RAT deploy automatically?

A

Loss of AC BUS 1 and 2

20
Q

Where/ when can the RAT be stowed?

A

On the ground

21
Q

What is the function of the hydraulic leak measurement valves and how are they operated?

A

Measure the leakage in each circuit and are closed by operation of the push buttons on the maintenance panel.

22
Q

How many hydraulic systems?

A

3; G B Y

23
Q

What is the operating pressure of the hydraulic systems?

A

3000psi

24
Q

What are the possible pressure sources for the hydraulic systems?

A

Engine Driven Pumps

Electric Pumps

Ram Air Turbine (RAT)

Power Transfer Unit (PTU)

25
Q

How is the system pressurized?

A

By bleed air from Engine 1 or through the cross bleed duct.

26
Q

What powers the Green System?

A

Engine 1 hydraulic pump

27
Q

What does the Power Transfer Unit (PTU) do?

A

Compares the Yellow and Green systems and pressurizes the lower with the higher if the differential is >500psi.

28
Q

What backup system does the yellow system have that the green does not?

A

A backup electric pump and hand pump.

29
Q

What does the yellow system power?

A

2 Thrust Reverser

Brakes

Cargo doors

30
Q

How is the BLUE system powered?

A

Electric pump ONLY

PTU can not pressurize

There are no engine pumps

RAT

31
Q

During engine failure or fire, the hydraulic valve closes on the ECAM. What is unique about the Yellow and Green systems when the valve is closed?

A

Although not depicted, the electric (yellow) or PTU can still pressurize the system without the engine operating.

32
Q

When is the PTU monitored and what does an amber indication mean?

A

The PTU is only tested during second engine startup. It is not monitored at any other time.

The amber PTU line on the ECAM means that the PTU has been selected OFF.

33
Q

What happens when the cargo doors are operated with the engines off?

A

The yellow electric pump engages when the cargo door is operated.

34
Q

When will the RAT deploy?

A

When power is lost to both AC BUS 1 & 2.

35
Q

When is the hydraulic pressure displayed in amber?

A

<1450psi

36
Q

Beside a pump failure, why else would you see a FAULT light on the hyd system?

A

Reservoir overheat

Reservoir low air pressure

Low Fluid Level

37
Q

Why would you manually deploy the RAT?

A

To pressurize the system without activating the emergency generator.

Only required if electric pump is lost and one of the other hyd systems has also failed.

38
Q

Name the 3 ways the RAT will be deployed?

A

Auto with loss of AC BUS 1&2

RAT MAN ON pb (no emer gen)

MAN ON on EMER ELEC PWR1

39
Q

What does it mean when you have all FAULT lights on during pre-flight?

A

The pneumatic reservoir pressure has bled overnight. APU bleed air will re-pressurize and extinguish the FAULTs

40
Q

When is the PTU inhibited?

A

Split Engine Master Switches
+
Nosewheel disconnected or Parking brake ON
+
On the ground
OR
40 seconds after cargo door operation

41
Q

Why should you delay second engine start 1 minute after cargo door ops?

A

The PTU is inhibited 40 seconds after cargo door ops to prevent inadvertent pressurizing the green side. When inhibited, the PTU will fail its self-test after 2nd engine start.

42
Q

What are the 3 types of reservoir problems?

A

Low Fluid Level

Low Air Pressure

Overheat

4. Systems (19 decks)

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