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B737-800 > Hydraulics > Flashcards

Hydraulics Flashcards

1
Q

Electric Hydraulic Pump OVERHEAT (amber)

A

hydraulic fluid used to cool and lubricate the electric pump has overheated or the pump itself is overheated

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2
Q

Hydraulic pump LOW pressure light (amber)

A

output pressure of associated pump is low

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3
Q

Engine Hydraulic pump switches

A

ON- de energizes blocking valve in pump to allow pump pressure to enter system

OFF- energizes blocking valve to block pump output

should remain ON at shutdown to prolong solenoid life

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4
Q

Normal pressure and maximum pressure of hydraulic system

A

Normal- 3000 PSI

Max- 3500PSI

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5
Q

White RF indication on DU

A

76%

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6
Q

Flight control switches (STBY RUD, OFF, ON)

A

STBY RUD- activates standby pump and opens standby rudder SOV to pressurize standby rudder PCU

OFF- closes flight control SOV isolating ailerons, elevators and rudder from associated hydraulic pressure

ON- normal operating position

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7
Q

Flight control low pressure lights (amber)

A

low hydraulic system A or B pressure to ailerons rudder and elevator
deactivated when associated FLIGHT CONTROL switch is position to STBY RUD

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8
Q

STANDBY HYDRAULIC LOW QUANTITY (amber)

A

indicates low quantity in standby hydraulic reservoir

always armed

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9
Q

standby hydraulic low pressure (amber)

A

indicates output pressure of standby pump is low

armed only standby pump operation is selected manually or automatically

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10
Q

ALTERNATE FLAPS master switch

A 
Off- normal position
ARM- 
closes TE flap bypass valve
activates standby pump
arms alternate flaps position switch
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11
Q

STBY RUD ON (amber)

A

indicates standby hydraulic system is commanded to pressurize the standby rudder PCU

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12
Q

Components powered by hydraulic system A

A 
Ailerons
Rudder
Elevator and elevator feel
flight spoilers (two on each wing)
ground spoilers
alternate brakes
No. 1 thrust reverser
Autopilot A
normal nose wheel steering
landing gear
PTU
main deck cargo door
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13
Q

Components powered by hydraulic system B

A 
ailerons
rudder
Elevator and elevator feel
flight spoilers (two each wing)
LE flaps and slats
TE flaps
normal brakes
No. 2 thrust reverser
Autopilot B
alternate nose wheel steering 
landing gear transfer unit
autoslats
yaw damper
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14
Q

where are the heat exchangers for the cooling of the hydraulic fluid?

A

Exchanger for system A in the main fuel tank 1

exchanger for system B in the main fuel tank 2

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15
Q

What happens if a hydraulic leak develops in the system A engine driven pump or its related lines?

A

the quantity will go to approx 20% full and pressure is maintained by the electric pump

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16
Q

what happens if a hydraulic leak develops in system A electric drive hyd pump or related lines?

A

quantity in reservoir decreases to 0

17
Q

What happens if a leak develops in either pump line or component of B?

A

Quantity will decrease until it reads 0, HOWEVER, the fluid remaining in the B reservoir is enough for PTU operation

18
Q

the PTU operates automatically when:

A

system B engine drive pump drops below limits
airborne
flaps less than 15 but not up

19
Q

What is the landing gear transfer unit and when does it operate?

A

Supplies the volume of hydraulic fluid needed to raise the landing gear at the normal rate when system A engine drive pump volume is lost.

Operates when:

  • airborne
  • engine 1 RPM drops below a limit value
  • landing gear lever positioned up
  • landing gear is not up and locked
20
Q

What does the standby hydraulic system power?

A

thrust reversers
rudder
LE flaps and slats (extend only)
standby yaw damper

21
Q

What happens when FLT control switch is placed in STBY RUD

A
  • activates electric standby pump
  • closes related flight control SOV to shut off pressure to aileron, elevator, rudder
  • opens standby rudder SOV
  • deactivates the flight control low pressure light
  • allows standby system to power rudder and thrust reversers
  • illuminates STBY RUD ON, master caution, FLT cont lights
22
Q

What happens when you position ALTERNATE FLAPS switch to ARM?

A
  • activates electric standby pump
  • closes TE flap bypass valve
  • arms alternate flaps position switch
  • allows standby system to power the LE flaps and slats and T/Rs
23
Q

When is automatic operation of the standby hydraulic system activated

A

loss of system A or B
flaps extended
airborne or wheel speed greater than 60
FLT control switch A or B ON

OR

Main PCU Force Flight Monitor trips

24
Q

What will happen if there is a leak in the standby hydraulic system?

A

the standby reservoir quantity will decrease to 0 and the system B fluid level will decrease to 70% full

25
Q

When does the standby hydraulic system LOW QUANTITY light illuminate?

A

when the quantity is approx half empty

26
Q

what might cause variations in hydraulic quantity indications in normal operations?

A

system pressurizing after engine start.

raising or lowering gear or LE devices

cold soaking

27
Q

What is the minimum fuel for ground operation of electric motor drive pumps in each main fuel tank?

A

1675 lbs

28
Q

What is the purpose of the PTU?

A

The PTU will supply the additional volume of hydraulic fluid needed to operate the autoslats and LE flaps at the normal rate when system B hydraulic pump volume is lost. It uses system A pressure to power the hydraulic motor driven pump, which pressurizes system B fluid. Operates automatically when:

  • System B engine driven pump hydraulic pressure drops below limits
  • airborne
  • flaps are less than 15 but not up
29
Q

During normal operations, variations in hydraulic quantity indications may occur in the following situations:

A

-system becomes pressurized after engine start
-raising or lowering landing gear or LE devices
-cold soaking occurs in long periods of cruise
These have little effect on operations

30
Q

If the hydraulic system is not properly pressurized, foaming can occur at high altitudes. What indications might you see?

A
  • pressure fluctuations
  • blinking of related LOW PRESSURE lights
  • MASTER CAUTION and HYD annunciator lights may also momentarily illuminate

B737-800 (21 decks)

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