INBOARD ENGINES HYDRAULIC RESERVOIR
B
OUTBOARD
HYDRAULIC
RESERVOIR
SIGHT
GLASS
(REF)
SAMPLING VALVE
FWD
DRAIN HYDRAULIC FLUIDVALVE QUANTITY TRANSMITTER (REF)
OUTBOARD ENGINES
HYDRAULIC RESERVOIR
B
SIGHT GLASS VIEWING PORT (REF)
SIGHT GLASS (REF)
Main Hydraulic Supply System - Component Location
Figure 102 (Sheet 2)
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A
747-400
FAULT ISOLATION/MAINT MANUAL
RELIEF AND SERVICE COMPONENTS
PRESSURE VALVE DIFFERENTIAL DIFFERENTIAL SEE C
(REF) INDICATOR PRESSURE
(REF)
SERVICE COMPONENTS
RETURN SEE C
GROUND SERVICE DISCONNECT 464A SYS 2 (INBOARD STRUT 2), 454A SYS 1 (INBOARD STRUT 1), TRAILING EDGE FAIRING DOOR,
ENGINE NACELLE 474A SYS 3 (INBOARD STRUT 3),
STRUT (REF) 484A SYS 4 (INBOARD STRUT 4)
RETURN MODULE SERVICE COMPONENTS
PRESSURE INDICATOR
SEE D
C
DIFFERENTIAL PRESSURE PRESSURE INDICATOR DEMAND PUMP
INDICATOR SEE E PRESSURE SWITCH,
(ON TOP OF CASE S342, S343,
DRAIN MODULE) S344, S345
(REF) DIFFERENTIAL PRESSURE INDICATOR (BEHIND GROUND SERVICE DISCONNECT)
(REF)
PRESSURE MODULE GROUND SERVICE DISCONNECT
ENGINE PUMP
EDP CASE MODULE DRAIN (NOT VISIBLE) S5, S6, S7, S8 PRESSURE SWITCH, PRESSURE
FILTER
MODULE FWD
PRESSURE INDICATOR PRESSURE INDICATOR
D E
Main Hydraulic Supply System - Component Location
Figure 102 (Sheet 3)
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747-400 FAULT ISOLATION/MAINT MANUAL
FWD THRUST REVERSER TO MID FAIRING DOOR 452AR (R STRUT 1) 462BR (R STRUT 2)
HYDRAULIC SUPPLY SHUTOFF VALVE V1, V2, V3, V4
HYDRAULIC SUPPLY COMPONENTS
F
Main Hydraulic Supply System - Component Location Figure 102 (Sheet 4)
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FAULT ISOLATION/MAINT MANUAL
LEFT THRUST REVERSER HALF, 415 (ENGINE 1), 425 (ENGINE 2), 435 (ENGINE 3), 445 (ENGINE 4)
ENGINE-DRIVEN PUMP
SEE G
HYDRAULIC CASE
DRAIN HOSE
CHECK VALVE
ENGINE-DRIVEN PUMP
HYDRAULIC PRESSURE FWD
HOSE CHECK VALVE
ENGINE-DRIVEN PUMP
G
Main Hydraulic Supply System - Component Location
Figure 102 (Sheet 5)
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747-400 FAULT ISOLATION/MAINT MANUAL
TRAILING EDGE ENGINE NACELLE STRUT
FAIRING DOORS 454A (STRUT 1) 484A (STRUT 4)
HYDRAULIC SHUTOFF COMPONENTS
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