(3)  
It is important that all of the the crossfeed valves are closed when the components in the fuel strainer housing are removed. If a crossfeed valve is open, fuel can go into the fuel-feed manifold from a main tank suction-feed inlet. When the components in the fuel strainer housing are removed, a fuel spill can occur when fuel from the main tank drains out through the fuel strainer housing.

 B.
Equipment

 (1)  
Containers - suitable for fuel:

 (a)  
20 gallon (76 liter) minimum (to contain fuel that remains in the fuel-feed manifold)

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747-400
MAINTENANCE MANUAL

FUEL SCAVENGE SYSTEM SEE A  FUEL STRAINER HOUSING ASSEMBLY BSEE 
REAR SPAR OF THE CENTER WING TANK (REF) 
FUEL SCAVENGE SYSTEM 
BODY HOUSING  A WASHER  JAMNUT  SPRING 

POPPET O-RING  GLIDE RING  O-RING  GUIDE POPPET  O-RING SPRING  RETAINER SPRING RING RETAINING
NOTE: DO NOT REMOVE____ 

0-RING  POPPET  RETAINING  FUEL  O-RING  STRAINER 
GUIDE  RING  STRAINER  WASHER  CAP 
RETAINER 

FUEL STRAINER HOUSING ASSEMBLY
B
Fuel Strainer Housing Assembly for the Fuel Scavenge System
(Component Removal)
Figure 402

C78075
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 C.
D.
E.
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747-400 MAINTENANCE MANUAL
 (b)  1 gallon (4 liter) minimum (to contain fuel that can drain out of the fuel strainer housing when the fuel strainer is removed)
References
 (1)  
AMM 32-00-30/201, Landing Gear Door Locks

 (2)
AMM 28-15-00/501, Fuel Scavenge SystemAccess

 (1)  
Location Zones 131 Center Section Wing Box, Left 132 Center Section Wing Box, Right

Procedure
 S 214-043
 (1)  Make sure the ground locks for the landing gear are installed.
 S 494-044
 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.
 (2)  
Do this Task: Installation of the Door Locks on the Wing Landing Gear (AMM 32-00-30/201).

 S 494-045

 (3)  
Do this Task: Installation of the Door Locks on the Body Landing Gear (AMM 32-00-30/201).

 S 864-087
 WARNING: IT IS IMPORTANT THAT ALL OF THE CROSSFEED VALVES ARE CLOSED
_______ WHEN THE COMPONENTS IN THE FUEL STRAINER HOUSING ARE REMOVED. IF A CROSSFEED VALVE IS OPEN, A FUEL SPILL CAN OCCUR WHEN FUEL FROM A MAIN TANK FLOWS INTO THE FUEL-FEED MANIFOLD AND DRAINS OUT OF THE FUEL STRAINER HOUSING. A FUEL SPILL CAN CAUSE INJURY TO PERSONS AND DAMAGE TO THE AIRPLANE.
 (4)  
Make sure all of the control switches for the fuel crossfeed valves (fuel management control module, P5 panel) are in the off position (the flowbar on the switch goes out).

 S 034-093

 (5)  
Go into the applicable wheel well for the wing landing gear to get to the cap for the fuel strainer housing.

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 S 494-047
 (6)  Put a suitable container under the fuel strainer housing to hold the fuel that drains out when the fuel strainer is removed.
 NOTE: The quantity of fuel that can drain out of the fuel strainer
　
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