B.
Control
(1)
Extension and retracting of the wing landing gear is controlled by moving the landing gear control handle to the UP, OFF, or DN position.
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FAULT ISOLATION/MAINT MANUAL
WING GEAR AND DOOR EXTENSION AND RETRACTION
COMPONENT SHT 102 FIG. QTY ACCESS/AREA REFERENCE
ACTUATOR - DOOR 2 2 L, R WING GEAR WHEEL WELLS 32-32-27
ACTUATOR - DOWNLOCK 1 2 L, R WING GEAR 32-32-15
ACTUATOR - GEAR 1 2 L, R WING GEAR 32-32-01
ACTUATOR - UPLOCK 3 2 MECHANISM OPERATED SEQUENCE VALVE AND L, R WING GEAR WHEEL WELL, UPLOCK 32-32-14
BEAM - DOOR ACTUATOR 2 2 ACTUATORL, R WING GEAR, L OR R DOOR 32-32-28
BUNGEE - DOWNLOCK 1 2 L, R WING GEAR 32-32-16
JOINT - DOOR ACTUATOR SWIVEL 2 2 DOOR ACTUATORL, R WING GEAR WHEEL WELL, L OR R 32-32-26
MECHANISM - DOOR OPERATED SEQUENCE VALVE 3 2 L, R WING GEAR WHEEL WELL 32-32-03
MECHANISM - DOWNLOCK OPERATED SEQUENCE VALVE 1 2 L, R WING GEAR WHEEL WELL 32-32-04
MECHANISM - UPLOCK OPERATED SEQUENCE VALVE 3 2 L, R WING GEAR WHEEL WELL 32-32-06
VALVE - DOOR OPERATED SEQUENCE 3 2 L, R WING GEAR WHEEL WELL 32-32-02
VALVE - DOOR SAFETY 4 2 L, R WING GEAR WHEEL WELL 32-32-29
VALVE - DOWNLOCK OPERATED SEQUENCE 1 2 L, R WING GEAR WHEEL WELL 32-32-04
VALVE - PRESSURE OPERATED RESTRICTOR CHECK 4 2 L, R WING GEAR WHEEL WELL 32-32-07
VALVE - UPLOCK OPERATED SEQUENCE 3 2 L, R WING GEAR WHEEL WELL 32-32-06
* SEE THE WDM EQUIPMENT LIST
Wing Gear and Door Extension and Retraction - Component Index
Figure 101
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ú Feb 10/92
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747-400
FAULT ISOLATION/MAINT MANUAL
DOWNLOCK OPERATED SEQUENCE VALVE AND MECHANISM
L OR R WING LANDING GEAR SEE B
SEE A
SPINDLE (REF)
ACTUATOR GEAR SIDE STRUT (REF)
DRAG BRACE (REF)
STRUT OUTER CYLINDER (REF) JURY STRUT (REF) DOWNLOCK BUNGEE DOWNLOCK ACTUATOR
(REF) SWIVEL
L OR R WING LANDING GEAR
A
DOWNLOCK OPERATED SEQUENCE UPPER
VALVE SIDE STRUT (REF)
DOWNLOCK OPERATED SEQUENCE VALVE
FWD
MECHANISM
DOWNLOCK OPERATED SEQUENCE VALVE AND MECHANISM B
Wing Gear and Door Extension and Retraction - Component Location
Figure 102 (Sheet 1)
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747-400 FAULT ISOLATION/MAINT MANUAL
DOOR OPERATED SEQUENCE VALVE AND MECHANISM
SEE E SHT 3
L OR R WING GEAR
WHEEL WELL WING GEAR WHEEL
WELL OUTBOARD DOOR
SEE C (REF)
WING GEAR WHEEL
WELL INBOARD DOOR
(REF)
L OR R DOOR
FWD ACTUATOR
SEE D
L OR R WING GEAR WHEEL WELL C
DOOR ACTUATOR BEAM
DOOR ACTUATOR SWIVEL JOINT
ACTUATOR ROD (REF)
DOOR ACTUATOR
FORWARD
RADIUS ROD
(REF)
L OR R DOOR ACTUATOR D
Wing Gear and Door Extension and Retraction - Component Location Figure 102 (Sheet 2)
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