PNEUMATIC
TURBINE
DUCT
DRIVE
(REF) AIR-DRIVEN PUMP
FWD
HYDRAULIC SHUTOFF COMPONENTS
H
Main Hydraulic Supply System - Component Location Figure 102 (Sheet 6)
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A

747-400 FAULT ISOLATION/MAINT MANUAL
ENGINE NACELLE STRUT
HYDRAULIC OIL COMPONENTS
SEE I
SYSTEM 1 OR 4 ELECTRONIC COMPONENT ASSEMBLY (PNEU DRIVE UNIT) M647 OR M874 TRAILING EDGE FAIRING DOORS, 454A (STRUT 1), 484A (STRUT 4)
GOVERN0R UNIT AND OIL PUMP DRIVE ASSEMBLY
GEARBOX OIL
45` ELBOW (REF)
BREATHER (REF)
(ORIFICE FITTING)
TURBINE DRIVE OIL FILTER MODULE
TURBINE DRIVE GEARCASE
HYDRAULIC OIL COMPONENTS
(VIEW IN THE FORWARD DIRECTION)

I

Main Hydraulic Supply System - Component LocationFigure 102 (Sheet 7)
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747-400 FAULT ISOLATION/MAINT MANUAL
TRAILING EDGE FAIRING DOORS, 454A (STRUT 1), 484A (STRUT 4)
GOVERNOR UNIT SEE J
OVERSPEED TRIP VALVE
TURBINE DRIVE
AIR-DRIVEN PUMP
SUPPLY HOSE (REF)
CASE DRAIN HOSE CHECK VALVE
PRESURE HOSE
FWDCHECK VALVE
GOVERNOR UNIT
J
Main Hydraulic Supply System - Component Location Figure 102 (Sheet 8)
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A
747-400 FAULT ISOLATION/MAINT MANUAL
SPEED CONTROL VALVE ACTUATOR
TRAILING EDGE (REF)
FAIRING DOORS 454A (STRUT 1) 484A (STRUT 4)
ENGINE NACELLE STRUT
SHUTOFF AND SPEED CONTROL VALVE UNIT
SEE L
SPEED CONTROL COMPONENTS
SEE  K  FWD 
SPEED CONTROL COMPONENTS  VALVE AIR FILTER SPEED CONTROL AND WATER SEPARATOR MODULE 
K 

ORIFICE (IN ACTUATOR CAP) (REF)
SHUTOFF VALVE POSITION SWITCH (AFT OF SHUTOFF VALVE ACTUATOR) (REF)
SHUTOFF VALVE ACTUATOR (REF)
FWD
SHUTOFF VALVE
SHUTOFF AND SPEED CONTROL VALVE UNIT AIR FILTER AND
WATER SEPARATOR
L  MODULE
Main Hydraulic Supply System - Component Location Figure 102 (Sheet 9)
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747-400
FAULT ISOLATION/MAINT MANUAL

TRAILING EDGE FAIRING DOORS 454A (STRUT 1) 484A (STRUT 4)
ADP COMPONENTS
SEE MAIR DRIVEN PUMP TURBINE DRIVE
SEE N
CONTROL AIR PRESSURE TUBE (REF)
ADP COMPONENTS
M  ACCELERATION CONTROL UNIT
AIR DRIVEN PUMP TURBINE DRIVE (VIEW LOOKING AFT)
N
Main Hydraulic Supply System - Component Location Figure 102 (Sheet 10)
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747-400 FAULT ISOLATION/MAINT MANUAL
COOLING COMPONENTS
SEE O
MAIN TANK
ACCESS DOOR
546AB (MAIN TANK 1)
　
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