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Boeing 747 > Hydraulics > Flashcards

Hydraulics Flashcards

1
Q

Hydraulic Demand Pump in AUTO

A

demand pump operates when:

  • respective engine hydraulic pump is low
  • respective FUEL CONTROL switch is CUTOFF
  • pumps 1 and 4 operate with flaps are in transit or past position 1
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2
Q

Amber Hydraulic Sys FAULT light

A
  • low HYD sys pressure
  • low HYD reservoir quantity
  • high HYD fluid temp
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3
Q

How many Hydraulic Systems

A
  • 4 powered by respective engine (HYD 1, 2, 3, 4)
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4
Q

What does each HYD consist of?

A

HYD 1:

  • 1 x Engine Driven Pump (EDP)
  • 1 x bleed air driven Demand Pump
  • 1 x HYD Interface module (HYDIM) - processes temp and pressure inputs
  • 1 x electric AUX pump (for ground handing) (PAX)

HYD 2:

  • 1 x EDP
  • 1 x electric driven Demand Pump
  • 1 x HYDIM

HYD 3:

  • 1 x EDP
  • 1 x electric driven Demand Pump
  • 1 x HYDIM

HYD 4:

  • 1 x EDP
  • 1 x bleed air driven Demand Pump
  • 1 x HYDIM
  • 1 x electric AUX pump (for ground handling)
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5
Q

Which HYD systems control steering and brakes?

A

HYD Sys 1:

  • nose wheel steering and body steering
  • alternate brakes

HYD Sys 2:
- alternate brakes

HYD Sys 4:
- normal brakes

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6
Q

Which HYD systems control flaps and landing gear?

A

HYD 1:

  • Inboard trailing edge flaps
  • Nose and Body Landing Gear

HYD 4

  • Outboard trailing edge flaps
  • Wing Landing Gear
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7
Q

Which HYD systems control ailerons and elevators?

A

All systems provide redundant control

HYD 1: left outboard/inboard aileron and left outboard/inboard elevator
HYD 2: left outboard/right inboard aileron and left inboard elevator
HYD 3: right outboard/left inboard aileron and right inboard elevator
HYD 4: right outboard/inboard aileron and right outboard/inboard elevator

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8
Q

RF displayed next to HYD QTY on status display

A

Displayed on the ground when reservoir requires REFILL

  • inhibited in flight and replaced by LO
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9
Q

DEMAND Pump Selector in AUX

A
  • aux pump operates on the ground until respective engine pump pressurizes
  • respective demand pump off
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10
Q

Demand Pump Low PRESS Light

A
  • demand pump selector OFF or AUX

- demand pump commanded to operate and output pressure is low

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11
Q

Purpose of Demand Pumps and AUX pump

A

Demand pumps: supply normal system demand if associated engine or EDP fails

AUX pump: electric pump for ground handling operations

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12
Q

What controls pump logic and processes HYD temp and pressure?

A

Dedicated hydraulic interface modules (HYDIM) on each system

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13
Q

What happens in the hydraulic system when an engine fire switch is pulled

A
  • respective hydraulic fluid shutoff valve closes
  • EDP depressurizes
  • respective demand pump operates
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14
Q

Equipment on HYD Sys #1

A
  • Center AP
  • Left OB and IB Aileron
  • Upper Rudder
  • IB Trailing Edge Flaps
  • Nose and Body Gear and Steering
  • Alternate Brakes
  • Left OB and IB Elevator
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15
Q

Equipment on HYD SYS #2

A
  • Right AP
  • Left OB Aileron and Right IB Aileron
  • Spoilers
  • Lower Rudder
  • Lower Yaw Damper
  • Alternate Brakes
  • Elevator Feel
  • Stab Trim
  • Left IB Aileron
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16
Q

Equipment on HYD SYS #3

A
  • Left AP
  • Left IB Aileron and Right OB Aileron
  • Spoilers
  • Upper Yaw Damper
  • Upper Rudder
  • Elevator Feel
  • Stab Trim
  • Right IB Elevator
17
Q

Equipment on HYD SYS #4

A
  • Right IB and OB Aileron
  • Spoilers
  • Lower Rudder
  • OB Trailing Edge Flaps
  • Wing Gear
  • Normal Brakes
  • Right IB and OB Elevator
18
Q

When do Demand Pumps #1 and #4 operate when in AUTO?

A
  • respective EDP low pressure
  • respective FUEL CONTROL switch CUTOFF
  • on the ground with flaps past 1 (pumps shut off when flaps reach position)
  • inflight with flaps past 1 (pumps continue to run)
19
Q

What happens if a yaw damper fault exists?

A
  • hydraulic power is removed from the related yaw damper system
  • related INOPERATIVE light illuminates
20
Q

What drives the Engine Driven Pump?

A

N2 Accessory Gear Box

Boeing 747 (21 decks)

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