S 014-003
 (2) Do these steps to get access to the aft cabin shutoff valve:
 (a)  Remove the lock/stop roller tray from the floor panel at station 1245, 17 inches to the left of the airplane centerline (AMM 25-58-01/401).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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A
747-400
MAINTENANCE MANUAL

MIX BAY
RIGHT WING GEAR WHEEL WELL (REF)
FORWARD CABIN SHUTOFF VALVE
SEE A
PACK 3 OUTLET DUCT
AFT CABIN SHUTTOFF VALVE
FWD
SEE B
PACK 2 OUTLET DUCT
COUPLING
MAIN DISTRIBUTION MANIFOLD
(2 LOCATIONS)
BONDING
FLEX DUCT JUMPER
ELECTRICAL
CONNECTOR AFT CABIN SHUTOFF VALVE
COUPLING
FORWARD CABIN
SHUTOFF VALVE

CLAMP (2 LOCATIONS)
ELECTRICAL CONNECTORFWD
A B
Cabin Shutoff Valve Installation
Figure 401

C23549
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747-400 MAINTENANCE MANUAL
 (b)  
Remove the floor panel at station 1245, 17 inches to the left of the airplane centerline (AMM 53-21-02/401).

 (c)  
Remove the lock/stop roller tray from the floor panel which is inboard and adjacent to the PDU 13L (AMM 25-58-01/401).

 (d)  
Remove the floor panel which is inboard and adjacent to the PDU 13L to get access to the aft cabin shutoff valve (AMM 53-21-02/401).

 S 864-004
 (3)  Do these steps to remove the forward cabin shutoff valve:
 WARNING: YOU MUST CAREFULLY INSTALL THE GROUND LOCKS IN ALL LANDING
_______ GEAR. AN ACCIDENTAL RETRACTION OF THE LANDING GEAR CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (a)  Install the ground locks in all the landing gear (AMM 09-11-00/201).
 WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO
_______ INSTALL THE DOOR LOCKS ON THE LANDING GEAR DOORS. THE DOORS CAN CLOSE QUICKLY IF YOU DO NOT INSTALL THE DOOR LOCKS CORRECTLY. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (b)  
Do this task: "Installation of the Door Locks on the Wing Landing Gear" (AMM 32-00-30/201).

 (c)  
Do this task: "Installation of the Door Locks on the Body Landing Gear" (AMM 32-00-30/201).

 (d)  
Get access to the valve in the right wing gear wheel well.

 D. Remove the Valve
 S 034-005
 (1)  Disconnect the electrical connector from the valve:
 (a)  
DV540, forward cabin shutoff valve

 (b)  
DV541, aft cabin shutoff valve

 S 034-006
 (2)  Do these steps to remove the forward cabin shutoff valve:
 (a)  
Disconnect the bonding jumper from the valve.

 (b)  
Remove the couplings from both sides of the valve.

 S 034-007
 (3)  
Do these steps to remove the aft cabin shutoff valve:

 (a)  
Remove the two clamps at the top of the valve.

 (b)  
Pull the flex duct away from the valve.

 (c)  
Remove the coupling from the bottom of the valve.

 (4)  
Remove the valve.

 S 024-008
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747-400 MAINTENANCE MANUAL
 S 434-009
 (5)  Put a cover on the duct openings.
 TASK 21-28-02-404-010
 3.  Cabin Shutoff Valve Installation (Fig. 401)________________________________
 A.  References
　
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