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A
747-400
MAINTENANCE MANUAL
Body Gear Hydraulic System Schematic
Figure 9 (Sheet 1)
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U23263
A
747-400 MAINTENANCE MANUAL
HYDRAULIC
PRESSURE
RETURN
CONDITION:
SYSTEM 1
GEAR UP SELECTED
GEAR DOWN & LOCKED
LANDING GEARDOOR OPENING SELECTOR VALVE
NEUTRAL DOWN
RETURN
TO TO
DOWN PRESSURENOSE
SECOND GEAR
BODY UP PRESSURE
GEAR
UNLOCK
DOWNLOCK
OPERATED
DOOR OPEN
SEQUENCE DOWN
RETURN UP
VALVE RET
DOOR
INT.
OPERATEDDOWN
SEQUENCE VALVE UNLOCK
DOWNC UPC
OPEN LOCK
UNLOCK UP
UPLOCKDOWNLOCK ACTUATORENGAGED
DISENGAGED DOWN
UP BODY GEAR ACTUATOR
RETURN
RETURN INT DN UP LOCK
UNLOCK
LEGEND:
UPLOCK OPER CLOSE OPEN
BLOCKEDHOOKSEQ VALVE CLOSED
DOWNLOCK UP OPEN
ACTUATOR PRESSURE
RETURN
OPEN
DOOR
DOWN SAFETY
DOOR
PRESSURE VALVE
ACTUATOR SNUBBER CLOSE
VALVE
Body Gear Hydraulic System Schematic
Figure 9 (Sheet 2)
U23264
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A
747-400 MAINTENANCE MANUAL
PRESSURE RETURN HYDRAULIC
CONDITION: SYSTEM 1
GEAR UP SELECTED
DOOR OPENING GEAR DOWN & LOCKED SELECTOR VALVE LANDING GEAR
RETURN NEUTRAL DOWN
TO TO
NOSE DOWN PRESSURE SECOND
GEAR BODY
UP PRESSURE GEAR
DOWNLOCK
OPERATED
DOOR OPEN SEQUENCE DOWN RETURN UP
VALVE RET
DOOR INT.
OPERATEDDOWN
SEQUENCE VALVE UNLOCK
DOWNC UPC
OPEN LOCK
UNLOCK UP
UPLOCKDOWNLOCK ACTUATORENGAGED
DISENGAGED DOWN
UP BODY GEAR ACTUATOR
RETURN
RETURN INT DN UP
LOCK UNLOCK
UPLOCK OPER CLOSE OPEN HOOK LEGEND:SEQ VALVE CLOSED
DOWNLOCK UP OPEN
ACTUATOR PRESSURE
RETURNOPEN
DOOR
DOWN SAFETY
DOOR
PRESSURE VALVE
ACTUATOR
SNUBBER CLOSE
VALVE
Body Gear Hydraulic System Schematic Figure 9 (Sheet 3)
U23265
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CONDITION:
GEAR UP SELECTED GEAR UP & LOCKED DOORS CLOSING
TO NOSE GEAR
DOWNLOCK
OPERATED
SEQUENCE
VALVE
INT.
OPEN
RETURN
UPLOCK OPER SEQ VALVE
DOOR SAFETY VALVE
A
747-400 MAINTENANCE MANUAL
HYDRAULIC SYSTEM 1
PRESSURE RETURN
LANDING GEAR
SELECTOR VALVE
NEUTRAL DOWN
RETURN DOWN PRESSURE
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