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AS 737 MAX > Hydraulics > Flashcards

Hydraulics Flashcards

1
Q

What are the Hydraulic Systems of the 737:

A

*System A
*System B
*Standby Hydraulic
System.

Provide power to the autopilot, flight controls, landing gear, thrust reversers and tail skid

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2
Q

How are the hydraulic reservoirs pressurized?

A
  • System A and B reservoirs are pressurized by bleed air.

The Standby Hydraulic
reservoir is pressurized
by the System B reservoir fill line

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3
Q

How are the hydraulic systems quantity and pressure indications indicated on the MDS?

A

The hydraulic quantity and pressure indications of system A and B are located on the inboard Display Unit after selecting SYS on the MFD panel

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4
Q

What does an RF on the HYDRAULIC indicator indicate and when is it valid?

A

Hydraulic quantity below 76% when:

On the ground with both engines shutdown
or
After landing with flaps up during taxi in.

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5
Q

How does flap operation affect hydraulic fluid quantity indications?

A

Extension of the leading edge devices (sys B) may result in up to 20% drop in indicated quantity

Retraction of LG may show up to 20% drop in indicated quantity (sys A)

Cold soaking in long cruise in low temp can result in additional 5% to 10% possibly 20% further drop in indicated quantity

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6
Q

What is the normal pressure of hydraulic systems A and B?

A
  • 3000 psi +/- 200psi.
  • 3500 psi maximum

Sans hyd. pump ops, press. can expect to be <100 psi

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7
Q

When does the STANDBY HYD LOW QUANTITY light illuminate?

A

When the standby reservoir is approximately 50% in reservoir.

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8
Q

Which precautions, should be taken when turning on the ELEC HYD pumps?

A

Verify there is more than 1675 lbs of fuel in the respective main fuel tank.

System B First ON last OFF to avoid hydraulic fluid migration.

Placing both ELEC Hydraulic Pump switches to ON simultaneously may create an amperage surge resulting in hydraulic pump motor circuit breakers tripping in the E&E Compartment.
* Staggering switch
selection to ON avoids
this condition.

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9
Q

What does moving a FLT CONTROL switch to STBY RUD do?

A

*Activates the standby
electric motor driven
pump
*shuts off the related
hydraulic pressure by
closing the SOV to:
* Ailerons
* Elevators
* Rudder
*Opens the Standby
Rudder Shutoff Valve
* Allows the Standby
system to power the
Rudder and the Thrust
Reversers
- Deactivates the related
FLT CONTROL LOW
PRESSURE light when the
Standby Rudder Shutoff
Valve opens.

  • Illuminates:
    o STBY RUD ON
    o FLT CONT
    o Master Caution
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10
Q

What causes the automatic operation of the Standby Hydraulic System?

A

Loss of System A or B with FLT CONTROL switch ON:
Airborne with Flaps extended,
Wheel speed greater than 60 kts, or
The main PCU(Power Control Unit) Force
Flight Monitor trips (FFM).

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11
Q

What does automatic operation of the standby hydraulic system activate?

A

-standby electric motor driven pump.
- opens standby rudder
shutoff valve.
- allows the standby system to power the rudder and thrust reversers.
- ill’ the STBY RUD ON
light & the FLT CONTROL
system annunciator and
Master Caution lights.

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12
Q

What is the purpose of the PTU?

A

Provides hydraulic pressure to operate the Auto-slats and leading edge devices if hyd sys. B drops below a specific value of 2350 psi

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13
Q

What fluid percentage does the standpipe in the system A reservoir preserve in the event of a leak?

A

With fluid level at the top of the standpipe, the reservoir quantity displayed indicates approximately 20% full. System A hydraulic pressure will be maintained by the Electric Motor Driven Pump EMDP.

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14
Q

What fluid percentage does the standpipe in the system B reservoir preserve in the event of a leak?

A

0%, however the fluid at the top of the standpipe still allows operation of the PTU.

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15
Q

With 0% indicated on the System B quantity indicator, can the PTU still operate?

A

Yes

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16
Q

How does a leak in the standby hydraulic reservoir affect the system B quantity?

A

If a leak occurs in the standby system, System B will continue to operate normally, and System B quantity indication will decrease and fall to approximately 70%.

17
Q

What components of system A are unique to that system?

A
  • Thrust Reverser 1
  • Ground Spoilers
  • Landing Gear
  • PTU
  • Alternate Brakes*
  • Nose Wheel Steering*
  • Flight Spoilers – Two per wing*
18
Q

What components of system B are unique to that system?

A
  • Thrust Reverser 2
  • Trailing Edge Flaps
  • Auto slats
  • Yaw Damper
  • Leading Edge Flaps and
    Slats
  • Landing Gear Transfer
    Unit
  • Brakes*
    -Brake Accumulator
  • ALT Nose Wheel
    Steering*
19
Q

The EDP (engine driven pump) supplies how much higher fluid volume than the electric motor-driven pump?

A

An EDP supplies approximately 6 times
the fluid volume of the respective electric motor-driven hydraulic pump

AS 737 MAX (16 decks)

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