787 Flight Crew Operations Manual
DO NOT USE FOR FLIGHT
Hydraulics Chapter 13
System Description Section 20
Copyright © The Boeing Company. See title page for details.
D615Z003-TBC 13.20.1
13.20 Hydraulics-System Description
Hydraulics20 System DescriptionSystem De scription
Introduction
The airplane has three independent 5000 psi hydraulic systems: left, right, and
center. The hydraulic systems power the:
Flight control system components are distributed so that any one hydraulic system
can provide adequate airplane controllability.
Hydraulic fluid is supplied to each hydraulic pump from the associated system
reservoir. The reservoirs are pressurized by pump outlet pressure.
Left and Right Hydraulic Systems
The left and right hydraulic systems are identical. They differ only in the
components they power.
The left hydraulic system powers:
• flight controls
• the left engine thrust reverser
• right and left wing spoilers
The right hydraulic system powers:
• flight controls
• the right engine thrust reverser
• right and left wing spoilers
Left and Right Hydraulic System Primary Pumps
The left and right hydraulic systems each have a primary pump. The left and right
primary pumps are engine–driven by the related left and right engines.
Left and Right Hydraulic System Demand Pumps
The left and right hydraulic systems each have a demand pump. The demand
pumps are electric motor–driven (EMPs). The demand pumps provide
supplementary hydraulic power for periods of high system demand. The demand
pumps also provide a backup hydraulic power source for the engine–driven
primary pumps.
• flight controls
• landing gear
• leading edge slats
• nose gear steering
• thrust reversers.
• trailing edge flaps
August 14, 2009
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