(2)
The installation of the fuel strainer housing for the hydromechanical scavenge system in the center wing tank.
(3)
The removal of the fuel strainer housing assembly for the hydromechanical scavenge system in the center wing tank. This includes all components of the fuel strainer housing except the housing body.
(4)
The installation of the fuel strainer housing assembly for the hydromechanical scavenge system in the center wing tank.
B.
There are two fuel strainer housing assemblies attached to the rear spar in the center wing tank (Ref LBL/RBL 112.60). The fuel strainer housing contains the fuel strainer, poppet valve and poppet guide.
C.
To get to the fuel strainer housing assemblies you must go through the center wing tank access door and the spanwise beam access doors.
D.
To remove the fuel strainer housing, the nut and washer on the rear spar of the center wing tank (in the wheel well for the wing landing gear) must be removed.
E.
When the fuel strainer housing is disconnected from the scavenge system any fuel that remains in the fuel-feed mainfold can drain out through the scavenge system tubing. Make sure a suitable container is in place to hold any fuel that remains in the fuel-feed mainfold. The amount of fuel that can drain out of the fuel-feed mainfold is approximately 20 gallons (76 liters).
F.
It is important that all of the crossfeed valves are closed when the fuel strainer housing is disconnected. If a crossfeed valve is open, fuel can go into the fuel-feed manifold from a main tank suction-feed inlet. When the fuel strainer housing is disconnected, a fuel spill can occur when fuel from the main tank drains out through the scavenge system tubing.
G.
An external leak check of the fuel strainer housing is done to make sure the fuel stainer housing and O-ring are installed correctly. The CWT is filled with fuel and a leak check is done at the fuel strainer housing. No leaks are permitted.
TASK 28-15-12-004-027
2. Fuel Strainer Housing Removal (Fig. 401)_____________________________
A. General
(1)
The removal of the two fuel strainer housing assemblies is almost the same.
B.
Equipment
(1)
Container - used to contain fuel (20 gallon - 76 liter minimum).
C.
References
(1)
AMM 28-11-00/201, Fuel Tanks
(2)
AMM 28-11-09/401, Spanwise Beam Access Door
(3)
AMM 28-26-00/201, Defueling
(4)
AMM 32-00-30/201, Landing Gear Door Locks
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
28-15-12
ALL ú ú 03 Page 401 ú Oct 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
D. 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
E.
Prepare for the Removal
S 214-048
(1) Make sure the ground locks for the landing gear are installed.
S 494-049
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 494-050
(3)
Do this task: Installation of the Door Locks on the Body Landing Gear (AMM 32-00-30/201).
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