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Boeing 757/767 > Hydraulic > Flashcards

Hydraulic Flashcards

1
Q

HYD QTY Display Values

A
  • % of Full
  • RF = Refill
  • OF = Overfill
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2
Q

Ram Air Press light (Green)

A
  • RAT deployed

* RAT producing hydraulic pressure

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3
Q

Components of Left Hydraulic System (757)

A
  • Reservoir
  • Eng Driven Pump (EDP) - primary pump
  • Elec Driven Pump - provides additional power (operates full time)
  • Power Transfer Unit (PTU)
  • Hand Pump for Main Cargo Door
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4
Q

Systems powered by Left Hydraulic Sys

A
  • Left Thrust Reverser
  • Alt Brakes
  • Left Autopilot
  • Spoilers
  • Right Aileron
  • Elevators
  • Rudder
  • Rudder Ratio
  • Left Yaw Damper
  • Flaps and Slats
  • Landing Gear
  • Nose Wheel Steering
  • Main Cargo Door
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5
Q

What happens to the HYD Sys when Engine Fire Switch is pulled

A
  • HYD shutoff valve is closed

- pump depressurized

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6
Q

When does PTU operate?

A
  • Left Engine Failure

- Left EDP low press

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7
Q

Purpose of PTU

A
  • Back up for left Sys
  • supplements left elec pump
  • Draws fluid from below standpipe level in left reservoir
  • Motor driven by Right Sys pressure
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8
Q

When activated what systems does the PTU drive?

A
  • Flaps and Slats
  • Landing Gear
  • Nose Wheel Steering
  • Main Cargo Door on ground via accessory panel PTU switch
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9
Q

Components of Right Hydraulic System (757)

A
  • reservoir
  • Electric Driven Pump (EDP)
  • Elec Driven Pump - provides addition power (operates full time)
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10
Q

Systems powered by Right HYD System

A
  • Right Thrust Reverser
  • Normal Brakes
  • Spoilers
  • Right Autopilot
  • Left Aileron
  • Elevators
  • Rudder
  • Elevator Feel
  • Stab Trim
  • PTU motor
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11
Q

Reserve Brake Switch

A
  • uses reservoir reserve fluid (below standpipe)
  • Open reserve brake valve
  • closes valve to other components
  • activates elec driven pump
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12
Q

Components of Center HYD Sys (757)

A
  • reservoir (maintains reserve fluid below standpipe for RAT pump)
  • 2 x elec driven pumps
  • RAT pump (back up)
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13
Q

When does the system shed the Center 2 pump?

A
  • sheds automatically to reduce electrical loads
  • when one generator running and both center electrical pumps ON (757)
  • when one generator running and all 4 electric pumps ON/Auto (767)
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14
Q

Where is RAT located?

A

Faring in left Main Gear

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15
Q

When does RAT deploy and what does it power?

A
  • Deploys MAN via switch or automatically when both engine fail above 80 knts
  • provides adequate hydraulic power above 130 knts for:
    - center Sys flight controls
    - center autopilot
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16
Q

Electric Demand Pump Selector - AUTO (767)

A
  • Left/Right Elec Demand pump operate when engine pump pressure is low
  • Left Elec Demand pump is inhibited on the ground during engine start of either engine
  • Right Elec Demand pump when Flaps 1, 5 ,15, 20
  • Center air demand pump operates when both center electric pump pressures are low
  • Center air demand pump operates when heavy load items are selected
  • Center air demand pump operates when HDG operating (loss of both main AC busses)
17
Q

Primary and Backup Hydraulic Pumps (767)

A

Left HYD:
Primary - L EDP
Backup - L Elec Demand Pump

Center HYD:
Primary - C Elec Pump 1 and 2
Backup - C Air Demand Pump

Right HYD:
Primary - R EDP
Backup - R Elec Demand Pump

18
Q

Brake Source Light

A
  • Norm and Alt Brake Press Low

- Only pressure from accumulator

19
Q

Systems Powered by Center Hydraulic Sys (767)

A
  • Tail Skid
  • Hydraulic Driven Generator (HDG)
  • Landing Gear
  • Nose Wheel Steering
  • Alternate Brakes
  • Flaps and Slats
  • Left Yaw Damper
  • Rudder
  • Elevator
  • Elevator Feel
  • Stab Trim
  • Spoilers
  • Left and Right Inboard Aileron
  • Center Autopilot
  • RAT pump
20
Q

Which systems utilize reserve hydraulic fluid (standpipe fluid)

A

Left system:
− None
− (B757) Power Transfer Unit (PTU)

Center system:
− Reserve brakes and steering
− (B757) Ram Air Turbine (RAT)

Right system:
− None
− (B757) Reserve brakes

21
Q

When does the Pitch Enhancement System (PES) operate?

A

o Operates if both left and center hydraulic systems fail
o Operates via yoke trim switches only
o Operates at 1/4 normal trim rate
o Powered by a Power Transfer Unit (PTU) which is:
- Driven by right hydraulic system
- Utilizes trapped fluid in left hydraulic system

22
Q

When is the center air demand pump commanded to operate in AUTO (767)

A 
− Center system pressure drops to a preset level – or – 
− High system demand operation: 
♦ Flaps/slats
♦ Landing gear
♦ Speedbrakes/spoilers
♦ HDG signaled to operate

Boeing 757/767 (19 decks)

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