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Applied Transport Category Aircraft Systems > Hydraulics > Flashcards

Hydraulics Flashcards

1
Q

How many hydraulics systems are on the 737?

A

3: System A, B, and Standby

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2
Q

Where is the hydraulic fluid stored?

A

In 3 reservoirs located in the main gear well

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3
Q

What powers the A and B systems?

A

One engine pump and one electric pump per system

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4
Q

What powers the Standby System?

A

Motor driven pump powered by the #2 AC Transfer Bus

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5
Q

What pressure do the hydraulic pumps normally operate at?

A

3000 psi

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6
Q

What is cavitation?

A

Rapid changes of pressure in a liquid lead to the formation of small vapor-filled cavities in places where pressure is relatively low

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7
Q

What are the A and B reservoirs pressurized by?

A

Pneumatic Manifold

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8
Q

How many Master Caution Lights does the A and B system have?

A

Each pump has a low pressure light, and both electric pumps have an overheat light

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9
Q

What causes the Overheat lights to illuminate?

A

When the fluid in the electric motor pump case drain or pump housing is too hot

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10
Q

When does the low pressure light illuminate?

A

If the output pressure from the associated pump is too low

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11
Q

When does the RF indication appear on the MFD hydraulic page?

A

If the quantity is below 76% with both engines shut down OR after landing with flaps up during the taxi in.

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12
Q

Does the Standby Hydraulic Pump have a Low Quantity and Low Pressure Caution Light? If so, where are the located?

A

Yes; In the top left of the overhead control panel

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13
Q

When does the standby system Low Quantity light illuminate?

A

If the fluid level is below 50%

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14
Q

How do you check the A and B system reservoir pressures?

A

By looking at the gauge located on each reservoir during the preflight walk around

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15
Q

What drives the engine driven pump in system A?

A

The #1 (left) engine

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16
Q

What powers the electric driven pump in system A?

A

The AC transfer bus #2

17
Q

What will the pressure in either System drop to if the engine or electric pump were to fail?

A

The system will maintain 3000 psi

18
Q

What happens if a leak occurs in the lines associated with the engine driven pump in system A?

A

The reservoir will drain down to the top of the standpipe where 20% should remain for the electrically driven pump

19
Q

What happens if a leak occurs in the lines associated with the electric driven pump in System A?

A

The reservoir will completely drain

20
Q

How is System A’s hydraulic fluid cooled?

A

After passing through the pumps, the return fluid is cooled by passing through a heat exchanger in the #1 main fuel tank before returning to the reservoir

21
Q

How much fuel does the #1 main fuel tank need to hold in order for proper hydraulic cooling on the ground?

A

1676 lbs

22
Q

What happens if the engine pump switch is turned off?

A

A solenoid held shutoff valve is powered and will block the output of the pump

23
Q

If a loss of electrical power occurs, what happens to the shutoff valve in the engine driven pump?

A

The shutoff valve opens and the pump fails to the ON condition

24
Q

What happens if the #1 Fire Switch is pulled?

A

The shutoff valve will close to stop the delivery of hydraulic fluid to the engine driven pump and the engine driven pump low pressure light is inhibited

25
Q

What drives the engine driven pump in the B system?

A

The accessory drive of the #2 engine

26
Q

What powers the electric motor pump in System B?

A

AC Transfer Bus #1

27
Q

What happens if a leak occurs in the lines associated with either pump in system B?

A

The fluid will drain to the top of the standpipe where fluid will remain for the PTU

28
Q

How much fluid will remain in the reservoir at the top of the standpipe during a leak in system B?

A

The quantity will show approximately zero and system pressure will be lost

29
Q

How is hydraulic fluid cooled for system B?

A

Same as system A, but with the #2 main fuel tank instead.

30
Q

What does the Standby Hydraulic pump power?

A

Thrust Reversers
Rudder
Leading Edge Devices (to extend position only)
Standby Yaw Damper (certain aircraft only)

31
Q

What powers the Standby Hydraulic System?

A

One electric motor pump

32
Q

When is the Standby System used?

A

When the A or B system has failed

33
Q

Where does the standby system receive its fluid and pressure?

A

System B reservoir

34
Q

What happens if the standby system has a leak?

A

The B system reservoir will provide fluid to the standby reservoir until the B system reservoir has decreased and stabilized at approximately 72%

Applied Transport Category Aircraft Systems (1 decks)

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