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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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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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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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