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Operations manuals > Hydraulics > Flashcards

Hydraulics Flashcards

0
Q

How are the hydraulic reservoirs pressurized?

A

By bleed air

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1
Q

How many hydraulic systems?

A

3; G B Y

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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

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

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.

Operations manuals (20 decks)

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