28-15-00
 ALL  ú ú 01B Page 8 ú Oct 10/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
B31084
A
747-400 MAINTENANCE MANUAL
 SCAVENGE SYSTEM FUEL STRAINER - MAINTENANCE PRACTICES
_____________________________________________________
 1.  General_______
 A.  This procedure has one task:
 (1)  
The removal and cleaning of the fuel strainer for the hydromechanical scavenge system in the center wing tank.

 B.  
A fuel strainer is found in each of the fuel strainer housing assemblies. The fuel strainer housing assemblies are attached to the rear spar on the center wing tank (Ref LBL/RBL 112.60).

 C.  
To get to the fuel strainers you must go in the wheel well for the wing landing gear.

 D.  
The fuel scavenge system will not operate (the system will be deactivated) if the left and the right side fuel strainers are removed from the fuel strainer housing assemblies. The poppet valves in the fuel strainer housing assemblies will stop the flow of fuel to the jet pumps.

 E.  
An external leak check of the fuel strainer housing is done to make sure the fuel stainer and cap are installed correctly. Fuel-feed manifold pressure is supplied by the boost pumps to pressurize the fuel strainer housing. No leaks are permitted.

 TASK 28-15-00-002-001
 2.  Fuel Strainer Cleaning (Fig. 201)______________________
 A.  General
 (1)  
The removal of the two fuel strainers is almost the same.

 B.  
Consumable Materials

 (1)  
DOO128 Petrolatum - Technical, VV-P-236

 C.  
References

 (1)  
AMM 12-11-01/301, Servicing

 (2)  
AMM 28-26-00/201, Defuel

 (3)  
AMM 32-00-30/201, Landing Gear Door Locks

 D.  
Access

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

 E.  
Remove and Clean the Fuel Strainer(s)

 (1)
Make sure the ground locks for the landing gear are installed.

 S 212-002
 S 492-003
 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).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 28-15-00
 ALL  ú ú 03 Page 201 ú Oct 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 492-004
 (3)  
Do this task: Installation of the Door Locks on the Body Landing Gear (AMM 32-00-30/201).

 S 032-007

 (4)  
Go into the applicable wheel well for the wing landing gear to get to the cap for the fuel strainer housing.

 S 492-028

 (5)  
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 housing is 15 cubic inches.

 S 032-008
 (6)  
Remove the lockwire between the strainer cap and the strainer housing.

 S 032-009

 (7)
Remove the strainer cap and the washer (inside the strainer cap).

 (a)  
Keep these components for the installation.

 S 032-026
 (8)  
Remove the fuel strainer from the fuel strainer housing.

 (a)  
Discard the O-ring.

 S 212-036
 (9)  
Inspect the fuel strainer and washer for damage.

 (a)  
Discard the component(s) if there is damage.

 S 172-029
 (10)
 Clean the fuel strainer with water or air pressure (90 PSI maximum).

 F.
Install the Fuel Strainer

 S 492-035
 (1)  Put a suitable container under the fuel strainer housing to hold the fuel that drains out when the fuel strainer is installed.
 NOTE: The quantity of fuel that can drain out of the fuel
　
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