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S Flaps are out of the 0_ position.
NOTE
AC motor pumps 1B and 2B do not automatically start during
or after an engine failure.
Hydraulic Control Panel
Figure 14---20---2
Hydraulic Control Panel
Overhead Panel
Vol. 1 14--20--5
REV 56, Jan 31/03
HYDRAULIC POWER
Systems 1 and 2
Flight Crew Operating Manual
CSP A--013
MASTER
C. Hydraulic Shutoff Valves
Electrically operated, normally open, hydraulic shutoff valves are installed in the suction
lines of the engine driven pumps (1A and 2A). During an engine fire condition, the
corresponding shutoff valve is motored closed when the ENG FIRE PUSH switchlight is
pressed. (See Chapter 10, Fire Protection).
Valve position is indicated on the EICAS, HYD synoptic page.
D. Reservoir
System 1 and 2 reservoirs are storage tanks that hold a reserve supply of hydraulic
fluid for their respective systems. The reservoirs are also partially pressurized with
system pressure to maintain a positive flow of fluid to the EDP and/or ACMP
E. Accumulator
An accumulator installed in each system stores hydraulic pressure. The accumulator is
charged with nitrogen and is used to dampen pressure surges and to maintain system
pressure during momentary system demand increases.
REV 56, Jan 31/03
Vol. 1 14--20--6
HYDRAULIC POWER
Systems 1 and 2
Flight Crew Operating Manual MASTER
CSP A--013
Systems 1 and 2 --- Synoptic Page
Figure 14---20---3
Vol. 1 14--20--7
REV 56, Jan 31/03
HYDRAULIC POWER
Systems 1 and 2
Flight Crew Operating Manual
CSP A--013
MASTER
Systems 1 and 2 --- EICAS Indications <MST>
Figure 14---20---4
HYD SOV 1 or 2 CLOSED advisory (green)
Indicates that corresponding shut--off valve has
been closed.
HYD SOV 1 or 2 OPEN caution (amber)
Indicates that the respective shut--off valve is
open with an associated engine fire.
Status Page
<0039>
<0039>
Primary Page
<0039>
<0006>
REV 56, Jan 31/03
Vol. 1 14--20--8
HYDRAULIC POWER
Systems 1 and 2
Flight Crew Operating Manual MASTER
CSP A--013
F. System Circuit Breakers
SYSTEM SUB--SYSTEM CB NAME BUS BAR CB
PANEL
CB
LOCATION
NOTES
HYD PUMP 1 AC BUS 2 A5
System 1 AC PUMP
CONT 1 DC BUS 2
2 G14
IND 1
G13
HYD PUMP 2 AC BUS 1 A5
Hydraulic
System 2 AC PUMP
CONT 2 DC BUS 1
1 G14
ystems IND 2
SG13
Fans
HYD SYST
FAN AC BUS 1 A8
FAN CONT DC BUS 1 G12
Shutoff Valves
HYD SOV
R ENG
DC EMER
1
S4
HYD SOV
L ENG
S5
Vol. 1 14--30--1
REV 56, Jan 31/03
HYDRAULIC POWER
System 3
Flight Crew Operating Manual
CSP A--013
MASTER
1. HYDRAULIC SYSTEM NO.3
Hydraulic system No.3 has the same components as systems No.1 and No.2, with the
exception that No. 3 system has two AC motor pumps (identified as 3A and 3B) and no
engine driven pump (EDP). Hydraulic system No.3 provides a nominal 3000 psi pressure to
the ailerons, elevators, rudder, spoilerons, landing gear actuators, inboard brakes and the
nosewheel steering system. System No.3 hydraulic lines pass through the wings and are
cooled by fuel.
REV 56, Jan 31/03
Vol. 1 14--30--2
HYDRAULIC POWER
System 3
Flight Crew Operating Manual MASTER
CSP A--013
Hydraulic System 3 --- Schematic
Figure 14---30---1
P P
S S
T
RETURN
MANIFOLD
BYPASS
VALVE
ACCUMULATOR
PRESSURE RESERVOIR
RELIEF/BLEED
VALVE
CASE
DRAIN FILTER
PRESSURE
SWITCH
PRESSURE
TRANSDUCER
FILTER
CASE DRAIN
FILTER
ACMP 3B
PRESSURE
SWITCH
PRESSURE
RELIEF
VALVE
ACMP 3A
FIREWALL SOV
TO HYDRAULIC
SERVICES
GROUND
SUCTION
GROUND
PRESSURE
PRESSURE MANIFOLD
LEGEND
Pressure (Red).
Return (Green).
Case drain (Yellow).
Pump case
filter drain.
SYSTEM 3
ACOUSTIC
FILTER
ACOUSTIC
FILTER
HYDRAULIC
THROUGH
TANKS
RETURN
FILTER
GROUND
SERVICE
FILLING
PRESSURE
GAUGE
GROUND
SERVICE
NITROGEN
Vol. 1 14--30--3
REV 56, Jan 31/03
HYDRAULIC POWER
System 3
Flight Crew Operating Manual
CSP A--013
MASTER
A. AC Motor Pumps
The No. 3 hydraulic system ACMP’s are controlled by switches on the HYDRAULIC
control panel. System pressure is normally maintained by pump 3A, which runs
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