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A
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MAINTENANCE MANUAL
WALKING BEAM
DOWN AND LOCKED
____NO TRUCK TILT WITH WEIGHT OF
NOTE:
AIRCRAFT ON WHEELS.
Wing Landing Gear Operating Sequence
Figure 7 (Sheet 1)
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MAINTENANCE MANUAL
IN TRANSIT
Wing Landing Gear Operating Sequence
Figure 7 (Sheet 2)
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MAINTENANCE MANUAL
PRESSURE RETURN
HYDRAULIC SYSTEM 4
CONDITION:
GEAR DOWN SELECTED GEAR DOWN & LOCKED LANDING GEARDOORS CLOSED SELECTOR VALVE
UP NEUTRAL RETURN
TO
DOWNLOCK DOWN PRESSURE SECOND
OPERATED WING
SEQUENCE UP PRESSURE GEAR
VALVE
DOOR CLOSED UNLOCK PRESS.DN DOOR OPEN
RETURN UP RET
DOOR INT.
OPERATEDDOWN
SEQUENCE VALVE UNLOCK
DOWNC UPC
OPEN LOCK UNLOCK
TEE UP
UPLOCK DOWNLOCK
ACTUATOR TIME
ENGAGED PRESSURE
DISENGAGED OPERATED RESTRICTOR CHECK VALVE
RETURN INT DN UP DOWN UP
TO
AUTOBRAKE
ACTUATOR
GEAR ACTUATOR
LEGEND: LOCK UNLOCK
BLOCKED UPLOCK OPER CLOSE OPEN
HOOK UP
SEQ VALVE CLOSED
PRESSUREOPEN
DOWNLOCK OPEN
RETURN
ACTUATOR DOOR
DOWN SAFETY DOOR
PRESSURE VALVE
ACTUATOR
SNUBBER CLOSE
VALVE
Wing Gear Hydraulic System Figure 8 (Sheet 1)
U23249
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
HYDRAULIC
PRESSURE RETURN
CONDITION:
SYSTEM 4 GEAR UP SELECTED GEAR DOWN & LOCKED
LANDING GEARDOORS OPENING SELECTOR VALVE
NEUTRAL DOWN RETURN
TO
DOWNLOCK DOWN PRESSURE SECOND
OPERATED WING
SEQUENCE UP PRESSURE GEAR
VALVE
DOOR CLOSED UNLOCK PRESS.DN DOOR OPEN
RETURN UP RET
DOOR INT.
OPERATEDDOWN
SEQUENCE VALVE UNLOCK DOWNC
UPC
OPEN LOCK UNLOCK
TEE UP
UPLOCK DOWNLOCK
ACTUATOR TIME
ENGAGED PRESSURE
DISENGAGED OPERATED RESTRICTOR CHECK VALVE
RETURN INT DN UP DOWN UP
TO
AUTOBRAKE
ACTUATOR
GEAR ACTUATOR
LEGEND: LOCK UNLOCK
BLOCKED UPLOCK OPER CLOSE OPEN
HOOK UP
SEQ VALVE CLOSED
PRESSUREOPEN
DOWNLOCK OPEN
RETURN
ACTUATOR DOOR
DOWN SAFETY DOOR
PRESSURE VALVE
ACTUATOR
SNUBBER CLOSE
VALVE
Wing Gear Hydraulic System Figure 8 (Sheet 2)
U23251
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
HYDRAULIC
PRESSURE
RETURN
CONDITION:
SYSTEM 4
GEAR UP SELECTED
DOORS HELD OPEN
LANDING GEARGEAR RETRACTING SELECTOR VALVE
NEUTRAL DOWN RETURN
TO
DOWNLOCK DOWN PRESSURE SECOND
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