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737 > Hydraulic > Flashcards

Hydraulic Flashcards

0
Q

What does Sys B pwr?

A 
#2 Thrust Reverser
Rudder
Ailerons
Elevator & Elevator Feel
Outboard Flight Spoilers
Normal Brakes
Autopilot "B"
Alternate for - Landing Gear
Alternate for - Nosewheel Steering
L.E. Flaps and Slats
Autoslats
Trailing Edge Flaps
Yaw Damper
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1
Q

What does Sys A power?

A 
#1 Thrust Reverser
Rudder
Ailerons
Elevator & Elevator Feel
Inboard Flight Spoilers
Alternate Brakes
Autopilot "A"
Landing Gear
Nosewheel Steering
Ground Spoilers
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2
Q

What does the Stby sys pwr?

A 
#1 Thrust Reverser
#2 Thrust Reverser
Rudder
Stby Yaw Damper
L.E. Flaps and Slats
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3
Q

How many hydraulic pumps?

A

5

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4
Q

Hydraulic pressure?

A

3000 psi

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5
Q

Sys A & B have what types of pumps?

A

The A and B systems are each pressurized by an engine driven pump and an electric motor driven pump.

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6
Q

How is the Stby Sys pump worked & powered?

A

In the event system A or B fails, the Standby system may be pressurized by a motor driven pump that is powered by the #2 AC Transfer bus.

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7
Q

Describe the PTU:

A

Upon loss of pressure from the engine driven pump on the B system, the PTU is driven by pressure from the A system.
The left side of the PTU is a hydraulic motor.
The right side of the PTU is a hydraulic pump that is driven by the left side of the PTU. It receives fluid from the B reservoir.

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8
Q

What does the PTU do:

A

The PTU provides a backup source of hydraulic pressure to assist the B system electric motor pump to operate the leading edge devices and the autoslat system when the B system engine driven pump output is below normal.

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9
Q

How are the A & B resivoirs pressurized?

A

Reservoir head pressure is maintained by bleed air to ensure fluid flow from the reservoirs to the hydraulic pumps.
The A and B reservoirs are pressurized from the pneumatic manifold.

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10
Q

The STBY resivoirs gets fluid and pressure from what Sys?

A

Sys B balance line

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11
Q

What does the hydraulic OVERHEAT LIGHT mean and about which motor?

A

OVERHEAT lights illuminate if the fluid in the ELECTRIC motor pump case drain or pump housing is too hot.

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12
Q

What do hydraulic LOW PRESSURE lights mean?

A

The LOW PRESS lights illuminate if the output pressure from the associated pump is too low.

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13
Q

Where are SYSs A&B qty and pressure normally shown?

A

Lower DU

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14
Q

When does the Refill (RF) indication show?

A

The RF (refill) indication appears 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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15
Q

When is the hydraulic standby PRESSURE LOW light illuminated?

A

If the Standby system is operating and its pump output pressure is low, the Standby Hydraulic LOW PRESSURE light illuminates.
The light is inhibited when the Standby system is off.

16
Q

When does the hydraulic stby system QTY LOW light come on?

A

The Standby system LOW QUANTITY light is always armed.

It illuminates if the fluid level is below 50 %.

17
Q

With a leak in SYS A, how far will the resivoir drain to?

A

If a leak develops in the lines associated with the engine pump, the reservoir will drain down to the top of the standpipe.
Thus, in the event of a leak in the lines associated with the engine pump, the reservoir will maintain approximately 20% of the hydraulic fluid for operation of the electric motor driven pump.

18
Q

What happens if there’s a leak in the line for the SYS A elec pump?

A

The “A” system electric motor pump receives fluid from the bottom of the “A” system reservoir.
A leak in the lines associated with the electric motor pump will cause the “A” system reservoir to empty.

19
Q

What is minimum fuel in tanks 1& 2 respectively for SYS A & B respectively elec motor pump on the ground for cooling?

A

1675 lbs

20
Q

With a loss of electrical power, the shutoff valve opens and the engine pump fails to the XXX condition.

A

On condition

21
Q

If the engine Fire Switch is pulled, the fire shutoff valve will close to stop the delivery of hydraulic fluid to which pump(s)?

A

the engine driven pump

22
Q

During normal operations the A system provides pressure for both the xxx and xxx.

A

landing gear and nosewheel steering operation

23
Q

What bus powers the SYS B hydraulic elec pump?

A

the AC Transfer Bus #1.

24
Q

What happens if there’s a leak anywhere in the SYS B?

A

On this frame, we show a leak.
If a leak develops in either pump or a “B” system component, the reservoir will drain down until the quantity shows approximately zero and the system pressure will be lost.

25
Q

If SYS B drains all the way, will the PTU have enough fluid?

A

Sufficient fluid will remain in the “B” reservoir to supply the Power Transfer Unit.

26
Q

When will the landing gear transfer unit kick in?

A

After takeoff, if the #1 engine N2 RPM falls below 56%, with the Landing Gear Lever up and either main gear not up and locked, the Landing Gear Transfer Unit will use system “B” to retract the gear at the normal rate.
Once the gear is retracted the Landing Gear Transfer Unit shifts back to System A operation.

27
Q

When is the STBY hydraulic system and elec motor used

A

When SYS A or B has failed

28
Q

The STBY SYS uses fluid from which SYS?

A

The Standby system reservoir can receive a portion of B system fluid by an interconnecting balance line from the B reservoir.
This design feature is one reason the B reservoir is larger than the A system reservoir.

29
Q

If the STBY SYS has a leak, what will SYS B drain to?

A

~ 72%

30
Q

How can the STBY SYS be activated?

A

The Standby system can be activated automatically or manually by the pilots using any of three switches on the Flight Control Panel.

31
Q

What does the STBY HYDRAULIC LOW PRESSURE light mean?

A

The LOW PRESSURE light for the Standby System will illuminate only when the Standby hydraulic pump is powered and the system operating pressure is low.
The light is inhibited when the Standby system is off.

32
Q

What does the STBY HYDRAULIC LOW QTY light mean?

A

The Standby System LOW QUANTITY light illuminates anytime the Standby system Reservoir is approximately 1/2 full and aircraft electrical power is available.
The LOW QUANTITY light is available regardless of Standby System operation.

33
Q

What is the difference between the SYS A AND SYS B FLT CONTROL switches?

A

Both shut off respective A & B pwr to the primary flight controls. Only SYS A causes the STBY RUD ON light to come on. However, the SYS B switch will cause the a Yaw damper to come off.

34
Q

What is the purpose of the ALTERNATE FLAP SWITCH?

A

This switch is used as an alternate method to operate the standby pump in the event of a loss of the “B” system pressure.
This switch provides a backup method of extending the leading edge and trailing edge devices.

35
Q

What happens when the ALTERNATE FLAP switch is moved to ARM?

A

When the ALTERNATE FLAPS switch is moved to the ARM position, the Standby motor pump activates, the Alternate Flaps UP/DOWN switch is armed, and the trailing edge flap bypass valve is closed.
Now the Standby motor pump is operating and the thrust reversers and Leading Edge extension valve are pressurized.

36
Q

When does the STBY SYS kick in automatically?

A

The Standby Hydraulic system will automatically operate if the “A” or “B” hydraulic system fails during takeoff or landing.
This automatic feature ensures full rudder operation when in slow flight, such as takeoff or landing.

37
Q

When does the PTU automatically work?

A
  • B System Engine driven pump fails
  • Flaps extended to less than 15, but not up.

Note: B737-800: Flaps extended all positions

737 (15 decks)

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