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A
747-400
MAINTENANCE MANUAL

FUEL SCAVENGE SYSTEM SEE A
CENTER WING TANK 
(REF) 
JET PUMP 
FLOAT VALVE IN THE  (4 LOCATIONS) 
NO. 2 MAIN TANK  FLOAT VALVE IN THE 
NO. 3 MAIN TANK 
A  A
NO. 2 MAIN TANK  NO. 3 MAIN TANK 
(REF)  (REF) 

HOUSING (2 LOCATIONS) FUEL STRAINER A  A 
(2 LOCATIONS) TANK THE CENTER WING FLOAT VALVE IN 
OUTBD  FWD  A FUEL SCAVENGE SYSTEM  BSEE HOUSING STRAINER FUEL 
(REF) INTERCOSTAL  (REF) CENTER WING TANK REAR SPAR OF THE 

SPANWISE BEAM  MID-SPAR OF THE  SPANWISE BEAM 
NO. 2 (REF)  (REF) CENTER WING TANK  NO. 1 (REF) 
A-A 

Fuel Strainer Housing for the Fuel Scavenge System
Figure 401 (Sheet 1)

A78563
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747-400
MAINTENANCE MANUAL

FUEL STRAINER HOUSING

Fuel Strainer Housing for the Fuel Scavenge System

Figure 401 (Sheet 2)

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A78569
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747-400
MAINTENANCE MANUAL

 (3)  
AMM 28-11-00/801, Fuel Tanks

 (4)  
AMM 28-11-01/401, Center Wing Tank Access Doors

 (5)  
AMM 28-11-09/401, Spanwise Beam Access Door

 (6)  
AMM 28-15-00/501, Fuel Scavenge System

 (7)  
AMM 28-26-00/201, Defuel

 (8)  
SWPM 20-20-00, Electrical Bond and Ground

 E.
Access

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

 (2)  
Access Panels
 131EZ Center Wing Tank Access Door
 132CZ Center Wing Tank Access Door
 131AZ Spanwise Beam Access Door
 131BZ Spanwise Beam Access Door
 131CZ Spanwise Beam Access Door
 132AZ Spanwise Beam Access Door

 F.
Install the Fuel Strainer Housing

 S 864-060
 WARNING:_______OBEY ALL THE FUEL TANK PURGING AND ENTRY PRECAUTIONS. YOU CAN CAUSE AN INJURY TO A PERSON AND CAUSE DAMAGE TO THE AIRPLANE.
 (1)  
Go into the center wing tank.

 S 164-100

 (2)  
Prepare the fuel strainer housing and the tank structure (rear spar) for a faying surface bond (SWPM 20-20-00).

 S 644-041

 (3)  
Lightly lubricate the new O-ring (for the fuel strainer) with the petrolatum.

 (4)  
Put the O-ring in the groove of the fuel strainer housing.

 S 434-040
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 S 114-101
 (5)  Make sure the faying surfaces between the fuel strainer housing and
 rear spar are clean and free from contamination (O-ring lubrication
 etc).
 S 424-036
 (6)  Put the fuel strainer housing in the correct position.
 (a) Align the slot in the fuel strainer housing with the
 anti-rotation plate.
 S 434-037
 (7)  Have a person go into the wheel well for the wing landing gear and
 do these steps:
 (a) Put the washer and the nut on the fuel strainer housing.
　
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