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737 Systems > Hydraulics > Flashcards

Hydraulics Flashcards

1
Q

Which items are found on the hydraulic System A?

A 
Flt Spoilers (2 per wing - 2,4,9,11)
Elevator/Elev Feel 
Ailerons
Rudder
Reverser 1
Autopilot A
PTU
Landing Gear
Altn Brakes
Norm Steering
Ground Spoilers
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2
Q

Which items are found on the hydraulic System B?

A 
Flt Spoilers (2 per wing) 
Elevator/Elev Feel Ailerons
Rudder
Reverser 2
Autopilot B
Flaps/LED/Autoslats
LGTU
Norm Brakes
Altn Steering
Yaw Damper
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3
Q

Which items are found on the hydraulic Standby System?

A

Rudder
Reversers

LED (extend only)

Stby Yaw Damper

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4
Q

What does hydraulic quantity “RF” indicate and when is it valid?

A

Refill (quantity

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5
Q

What happens when engine hydraulic pump switches are positioned to OFF?

A

Energizes blocking valve to block pump output (shuts off fluid after the pump)

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6
Q

What happens to hydraulics when an engine fire switch is pulled?

A

Closes Hydraulic Fluid Shutoff Valve (shuts off fluid before the pump)

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7
Q

What happens if there is a leak in the System A engine-driven pump or related lines?

A

Standpipe saves 20% of fluid for use by System A electric pump

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8
Q

What happens if there is a leak in the System A electric pump or related lines?

A

Quantity decreases to zero – system lost

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9
Q

What happens if there is a leak in the System B (either pump) or related lines?

A

Quantity decreases to zero – system lost, but standpipe saves enough fluid for PTU operation

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10
Q

What happens if there is a leak in the System B (either pump) or related lines?

A

Quantity decreases to zero – system lost, but standpipe saves enough fluid for PTU operation

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11
Q

What is the purpose of the PTU?

A

If System B engine-driven pump lost, uses System A pressure to power a hydraulic motor-driven pump (PTU) to pressurize System B fluid for normal-rate operation of the LEDs (and autoslats)

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12
Q

When does the PTU operate?

A
  • Airborne, and
  • System B engine-driven pump pressure below limits, and
  • Flaps less than 15° but not up (i.e. at 1°, 2°, 5° or 10°) (3LC> Flaps not up)
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13
Q

What is the purpose of the LGTU?

A

If System A engine-driven pump lost, uses System B pressure to supply fluid volume needed for normal-rate retraction of landing gear

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14
Q

When does the LGTU operate?

A
  • Airborne, and
  • No. 1 Engine RPM drops below limits, and
  • Gear Lever UP but either main gear not up and locked
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15
Q

What happens when either FLIGHT CONTROL Switch in STBY RUD?

A
  • Closes Flight Control Shutoff Valve (isolating ail/elev/rud from assoc sys press)
  • Opens Standby Rudder Shutoff Valve
  • Activates Standby Pump (allowing Stby Sys to power rudder & reversers)
  • Lights – deactivates assoc Flt Cont LOW PRESSURE Light, and illuminates STBY RUD ON, M/C and FLT CONT System Annun Lights
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16
Q

What happens when ALTERNATE FLAPS Master Switch in ARM?

A
  • Closes TE Flap Bypass Valve
  • Activates Standby Pump (allowing Stby Sys to power LEDs + reversers)
  • Arms ALTERNATE FLAPS Position Switch
17
Q

What happens when ALTERNATE FLAPS Master Switch in ARM?

A
  • Closes TE Flap Bypass Valve
  • Activates Standby Pump (allowing Stby Sys to power LEDs + reversers)
  • Arms ALTERNATE FLAPS Position Switch
18
Q

When is the Standby System automatically activated?

A
  • Airborne or at least 60K wheel speed, and
  • Flaps extended, and
  • FLT CONTROL Switch ON (A or B), and System A or B lost

or

• Main Rudder PCU FFM trips

19
Q

When is the Standby System automatically activated?

A
  • Airborne or at least 60K wheel speed, and
  • Flaps extended, and
  • FLT CONTROL Switch ON (A or B), and System A or B lost

or

• Main Rudder PCU FFM trips

20
Q

What happens when the Standby System is automatically activated?

A
  • Opens Standby Rudder Shutoff Valve
  • Activates Standby Pump (allowing Stby Sys to power rudder & reversers)
  • Lights – illuminates STBY RUD ON, M/C and FLT CONT System Annun Lights
21
Q

What happens when the Standby System is automatically activated?

A
  • Opens Standby Rudder Shutoff Valve
  • Activates Standby Pump (allowing Stby Sys to power rudder & reversers)
  • Lights – illuminates STBY RUD ON, M/C and FLT CONT System Annun Lights
22
Q

When does the STANDBY HYD LOW QUANTITY Light illuminate?

A

When reservoir 1⁄2 full

23
Q

What are the hydraulic system pressure limits and normal indications?

A
  • Preflight minimum 2800 psi
  • Normal 3000 psi
  • Maximum 3500 psi
24
Q

What is the power source for the electric hydraulic pumps?

A
  • System A electric pump Generator 2

* System B electric pump Generator 1

25
Q

Which items are found on the hydraulic System B?

A 
Flt Spoilers (2 per wing - 3,5,8,10) 
Elevator/Elev Feel 
Ailerons
Rudder
Reverser 2
Autopilot B
Flaps/LED/Autoslats
LGTU
Norm Brakes
Altn Steering
Yaw Damper
26
Q

Which items are found on the hydraulic Standby System?

A

Rudder
Reversers
LED (extend only)
Stby Yaw Damper

737 Systems (12 decks)

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