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Reservoir............................................................................................................. 12-11
AC-Motor Pumps (ACMP’s) ................................................................................ 12-11
Filter Manifold...................................................................................................... 12-11
Hydraulic Shutoff Valve Control Panel ................................................................ 12-12
Hydraulic Shutoff Valves ..................................................................................... 12-12
Heat Exchanger .................................................................................................. 12-13
System 2 Accumulator .............................................................................................. 12-14
Ground Service Access....................................................................................... 12-14
Hydraulic System 1 Schematic ........................................................................... 12-15
Hydraulic System 2 Schematic ........................................................................... 12-16
Hydraulic System 3 ................................................................................................... 12-17
Reservoir............................................................................................................. 12-17
ACMP’s 3A and 3B ............................................................................................. 12-17
Ram Air Turbine (RAT) ....................................................................................... 12-18
Heat Exchanger .................................................................................................. 12-18
Filter Manifold...................................................................................................... 12-18
Ground Service Panel .........................................................................................12-19
RAT and System 3 Accumulators ....................................................................... 12-19
Hydraulic System 3 Schematic ........................................................................... 12-20
RAT Deployment Hydraulic Schematic ............................................................... 12-21
Hydraulic Control Panel ............................................................................................ 12-22
Manual Mode ...................................................................................................... 12-22
Auto Mode (Pumps 1B, 2B and 3B) ....................................................................12-22
Ground Operation Inhibits ................................................................................... 12-23
Flight Operation................................................................................................... 12-23
P I LOT T R A I N I N G GU I D E
HYDRAULICS
12-ii For Training Purposes Only
Sept 04
RAM Air Turbine (RAT) ....................................................................................... 12-23
ACMP Power and Distribution .................................................................................. 12-24
ACMP’s 1B and 2B ............................................................................................. 12-24
ACMP’s 3A and 3B ............................................................................................. 12-24
ACMP Electrical Power Schematic ........................................................................... 12-25
External and APU Power-ACMP Operation.............................................................. 12-25
Reservoir Quantity Limits.......................................................................................... 12-25
EICAS Messages...................................................................................................... 12-28
EMS Circuit Protection.............................................................................................. 12-30
For Training Purposes Only
Sept 04
12-1
P I LOT T R A I N I N G GU I D E
HYDRAULICS
INTRODUCTION
Hydraulic power is provided by three independent and isolated systems designated 1,
2 and 3 and operate at a nominal pressure of 3000 psi.
SYSTEM 1 AND 2
Systems 1 and 2 are each powered by an Engine-Driven Pump (EDP), and an ACMotor
Pump (ACMP). The EDPs designated as 1A and 2A are mounted on the
respective engine accessory gearbox, and hydraulically power systems 1 and 2 when
the engines are operating.
The ACMPs designated as 1B and 2B are used as essential pumps for takeoff,
approach, landing and in support of the EDPs in the event of failure. The ACMPs are
selectable through switches located on the HYDRAULIC control panel in the flight
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