CHAPTER
29
Hydraulic Power
CHAPTER 29 Hydraulic Power
29-CONTENTS
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D633W101-BEJ
Sep 05/2003
HYDRAULIC POWER -INTRODUCTION
General
Three hydraulic systems supply pressurized hydraulic fluid to supply power to these airplane systems:
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Flight controls
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Landing gear actuation
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Main gear brakes
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Main and nose landing gear steering
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Leading edge slats
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Trailing edge flaps
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Thrust reversers.
These systems make up the hydraulic power system:
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Main hydraulic systems
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Ram air turbine (RAT) system
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Hydraulic indicating systems
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Ground servicing system.
Main Hydraulic Systems
The three hydraulic systems are Left, Center, and Right. The names give the location of their main components.
Ram Air Turbine System
The ram air turbine supplies an emergency source of hydraulic power to operate the flight controls. The RAT also supplies emergency electrical power.
EFFECTIVITY
BEJ ALL
Hydraulic Indicating System
The hydraulic indicating system shows these hydraulic system indications on the flight deck:
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System pressure
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Pump pressure
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Reservoir pressure
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Pump temperature
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Reservoir temperature
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Hydraulic reservoir quantity
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Valve positions.
Ground Servicing System
A central servicing bay permits you to fill the three hydraulic reservoirs from a single location.
Abbreviations and Acronyms
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ACMP -alternating current motor pump
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actr -actuator
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ADIRU -air data inertial reference unit
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ADP -air driven pump
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ADU -air drive unit
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AFDC -autopilot flight director computer
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AIMS -airplane information management system
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ARINC -Aeronautical Radio, Inc.
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APUC -auxiliary power unit controller
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AS -airspeed
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auto -automatic
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ASG -ARINC signal gateway
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ASCPC -air supply and cabin pressure controller
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HYDRAULIC POWER -INTRODUCTION
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C -center
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capt -captain
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CD -case drain
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CHIS -center hydraulic isolation system
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CL -center left
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CR -center right
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CTC -cabin temperature controller
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depress -depressurization
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disc -disconnect
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EDIU -engine data interface unit
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EDP -engine driven pump
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EEU -ELMS electronic unit
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ELMS -electrical load management system
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eng -engine
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FSEU -flap slat electronics unit
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gnd -ground
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HLCS -high lift control system
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hyd -hydraulic
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HYDIM -hydraulic interface module
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isln -isolation
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L -left
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LG -landing gear
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LSCU -logic and speed control unit
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LVDT -linear variable differential transformer
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MAT -maintenance access terminal
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mgmt -management
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MLG -main landing gear
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MSOV -modulating and shutoff valve
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NG -nose gear
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NLG -nose landing gear
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OPAS -overhead panel ARINC 629 system
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PCU -power control unit
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PFC -primary flight computer
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PFCS -primary flight control system
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pnl -panel
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press -pressure
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PSEU -proximity sensor electronics unit
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pwr -power
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qty -quantity
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R -right
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RAT -ram air turbine
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rlf -relief
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RPM -revolutions per minute
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rsv -reserve
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rsvr -reservoir
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rtn -return
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RWW -right wheel well
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sply -supply
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stby -standby
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svce -service
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sys -system
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temp -temperature
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TGA -turbine gearbox assembly
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VIGV -variable inlet guide vanes
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vlv -valve
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xdcr -transducer
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D633W101-BEJ Jan 05/2002
777 AIRCRAFT MAINTENANCE MANUAL
HYDRAULIC POWER -INTRODUCTION
EFFECTIVITY BEJ ALL 29-00-00
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