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B737 Module 3 and 4 > ATA 29 Hydraulics > Flashcards

ATA 29 Hydraulics Flashcards

1
Q

How many pumps are used in the MAX main and auxiliary hydraulic systems?

A

6, 2 EDP, 2 EMDP, 1 standby and 1 PTU

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2
Q

How is hydraulic system A and B fluid cooled? Is it pressure, return or case drain fluid?

A

CASE DRAIN fluid is used to cool the internal components of the pump

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3
Q

Where is the standby hydraulic reservoir located?

A

keel beam AFT

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4
Q

Where is the standby hydraulic pump located?

A

Wing to body fairing behind right hand wheel well

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5
Q

The standby hydraulic pump provides pressure for _______________________.

A

Left and Right TR, leading edge flaps and slats, and rudder.

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6
Q

List the conditions needed to operate the PTU.

A

Airplane in the air
Trailing edge flaps not up
System B EDP low pressure (1250psi for more than 0.5 sec)

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7
Q

The PTU provides pressure to the ______________ and _______________.

A

Leading edge flaps and slats

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8
Q

The hydraulic system A or B overheat light is on, what does this mean?

A

When the pump case drain hydraulic fluid temperature increases to more than 225F(107C).

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9
Q

List the conditions that can cause the standby pump to operate manually when in the air?

A

Flight control switch A and B
ALT Flap Switch to arm

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10
Q

List the conditions that can cause the standby pump to operate automatically when in the air.

A

-Either FLT CNTRL A or B switch to ON
-ALT FLAPS arm switch to OFF
-Trailing edge flaps not up
-Airplane in the or wheel speed more than 60kts
-Low flight control pressure

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11
Q

What conditions are required for the hydraulic system RF message to show on the MDS systems page?

A

Landing gear down, airplane on the ground, and trailing edge flaps are up or both engines aren’t running.

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12
Q

What does the PTU drive?

A

Flaps and slats

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13
Q

When do you service the main hydraulics reservoir?

A

76%.

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14
Q

There’s always pressure in the hydraulic system, what’s the reason for this?

A

Positive pressure to the pumps and prevents foaming

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15
Q

When does the relief light come on?

A

3500PSI

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16
Q

What happens when you operate the engine fire switch’s?

A

The pump low pressure amber light is disarmed and the hydraulic fluid supply to the related EDP stops.

17
Q

A and B Hydraulic volumes?

A

A = 6.8gal
B = 10.7gal

18
Q

Where is the EDP located?

A

Front face of the engine AGB(Accessory gear box) on the left side of the engine

19
Q

What is the EDP rated at?

A

36gpm(gallons per minute) at 3000PSI

20
Q

How many pistons does the EDP have?

A

Rotating cylinder that has nine pistons

21
Q

What is the rate of the EMDP?

A

5.7GPM

22
Q

What kind of motor does the EMDP have?

A

Oil cooled, three phase 115V AC motor

23
Q

Do no operate the EDP or EMDP with the _______ ________ _________ return and pressure lines connected. This may prevent the pumps from receiving enough hydraulic fluid from their respective reservoirs and cavitate the pump.

A

portable hydraulic cart

24
Q

How many pounds of fuel is needed if you want to run the hydraulic system?

A

1675 lbs of fuel

25
Q

When does the differential pressure indicator pop?

A

Differential pressure of 65PSI

26
Q

How many spoilers are there?

A

12 (4 ground spoilers and 8 flight spoilers)

27
Q

System A and System B are connected to which spoilers?

A

A: Ground Spoilers and 4 flight spoilers.
B: 4 flight spoilers

28
Q

What are the conditions to inspect and service the system?

A

Flight Controls-Neutral
LE flaps and slats-Up
TE Flaps-up
Spoilers-Down
Landing gear-Down
TR: Closed
Hydraulic system A and B: off
Brake accumulator pressure: 2850PSI or more

29
Q

When does the low quantity indication come on for the standby system?

A

50%
low pressure
stby rud on

30
Q

How much does the standby system reservoir hold?

A

3.6 gallons

31
Q

What is the rate of the standby hydraulic system?

A

3.7 GPM at 2700psi

32
Q

What is the power rating for the standby hydraulic pump?

A

3 phase, 400Hertz, 115V AC electrical motor

33
Q

Each valve has a __________?

A

Manual override

34
Q

Whats the rate for the PTU flow limiter?

A

13.7 GPM

35
Q

What pressure source to retract landing gear?

A

System A for Normal, but if there’s a loss in system A pressure system B will port pressure through the transfer valve automatically for RETRACTION ONLY.

36
Q

standby pump indications?

A

low quantity
low press
stby rudder

37
Q
A

B737 Module 3 and 4 (11 decks)

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