777 AIRCRAFT MAINTENANCE MANUAL
HYDRAULIC POWER -LRU REPLACEMENT TESTS
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MAIN HYDRAULIC SYSTEMS -HYDRAULIC SYSTEM SUMMARY
General
Three independent hydraulic systems supply hydraulic power to airplane systems.
Left Hydraulic System
An EDP is the primary pump for the left hydraulic system. An ACMP is the demand pump for the left hydraulic system.
The left hydraulic system supplies hydraulic power to these systems:
*
Flight controls
*
Left thrust reverser.
Right Hydraulic System
An EDP is the primary pump for the right hydraulic system. An ACMP is the demand pump for the right hydraulic system.
The right hydraulic system supplies hydraulic power to these systems:
*
Flight controls
*
Right thrust reverser
*
Normal brake system.
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Center Hydraulic System
Two ACMPs are the primary pumps for the center hydraulic system. Two ADPs are the demand pumps for the center hydraulic system. A ram air turbine is an emergency source of hydraulic pressure for the center system primary flight controls.
The center hydraulic system supplies hydraulic power to these systems:
*
Flight controls
*
Leading edge slats
*
Trailing edge flaps
*
Landing gear actuation
*
Alternate and reserve brakes system
*
Normal and reserve nose landing gear steering
*
Main landing gear steering.
Hydraulic System Servicing
A service bay permits you to fill the three hydraulic systems from a single location.
Hydraulic System Indications
Pressure, temperature, and quantity sensors supply this hydraulic system data:
*
System pressures
*
Pump pressures
*
Reservoir pressures
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MAIN HYDRAULIC SYSTEMS -HYDRAULIC SYSTEM SUMMARY
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Pump temperatures
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Reservoir temperatures
*
Reservoir quantities.
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MAIN HYDRAULIC SYSTEMS -HYDRAULIC SYSTEM SUMMARY
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BOEING PROPRIETARY -Copyright # -Unpublished Work -See title page for details.
MAIN HYDRAULIC SYSTEMS -INTRODUCTION
General
The left, center, and right hydraulic systems operate independently to supply hydraulic power to the airplane systems. All three systems operate at 3000 psi nominal pressure.
The hydraulic systems use BMS 3-11 hydraulic fluid.
The components and hydraulic tubing of the three systems are color coded. The left system is red, the center system is blue, and the right system is green.
Each hydraulic system has one or more primary and demand pumps. Primary pumps normally operate continuously. Demand pumps operate only when additional power is necessary.
Left and Right System
The left and right hydraulic systems are similar. These systems each have an engine-driven pump (EDP) as the primary pump and an alternating current motor pump (ACMP) as the demand pump.
The left hydraulic system supplies power for these systems:
*
Primary flight control system (PFCS)
*
Left thrust reverser.
The right system supplies power for these systems:
*
PFCS
*
Right thrust reverser
*
Normal brake system.
Center System
The center hydraulic system has two ACMPs as the primary pumps. Two air-driven pumps (ADPs) are the center system demand pumps. A ram air turbine (RAT) supplies an emergency source of hydraulic power to the flight controls in the center hydraulic system.
The center system also includes a center hydraulic isolation system (CHIS) for reserve brake and steering operation.
The center system supplies hydraulic power for these systems:
*
PFCS
*
Alternate and reserve brakes
*
Normal and reserve nose gear steering
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