COUPLING
FLOAT VALVE- (2 LOCATIONS)
CENTERWING TANK
BOTTOM OF THE
CENTER WING
TANK (REF)
FLOAT VALVE - CENTER WING TANK
AD
FUEL TUBE TO THE FUEL TRANSFER LINE
FUEL TUBE TO THE JET PUMPS FUEL STRAINER HOUSING
REAR SPAR (REF) (DRY SIDE)
NUT
FUEL STRAINER HOUSING
AE
Storage - Component Location (Details from Sht 12)
Figure 102 (Sheet 15)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
B34489
A
747-400 FAULT ISOLATION/MAINT MANUAL
MISCELLANEOUS DEFUEL MODULE, M6599
Storage - Component Location
Figure 102 (Sheet 16)
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H08203
A
747-400 MAINTENANCE MANUAL
FUEL TANKS - DESCRIPTION AND OPERATION
______________________________________
1. General_______
A. The fuel tanks provide storage for the fuel that is delivered to the engines. The tanks are located in the interspar area of each wing and in the wing center section in the fuselage. The tanks are designated No. 1, No. 2, No. 3, and No. 4 main tanks, No. 2 and No. 3 reserve tanks, and center wing tank. A vent surge tank is located near the tip of each wing. Refer to Fig. 1 for tank capacities.
B. Each tank is an integral portion of the wing structure, sealed to provide a fluid-tight compartment. Sealing is accomplished primarily by the close metal-to-metal fit of all parts, by use of sealed fasteners, and by the application of sealing compound to all applicable joints in the structure.
C. The ribs in the tanks act as baffles to prevent excessive fuel sloshing. Baffle check valves are installed in the wing ribs at various locations to prevent fuel from flowing away from the boost pumps and to prevent a rapid shift in CG due to airplane attitude changes (roll).
D. Fuel sump drain valves are installed in low points in the tanks to permit draining accumulated moisture from the tanks and for draining remaining fuel when the tank has been defueled.
E. Located within the fuel tanks are the fuel lines, pumps, valves, vents, drains, and sensing equipment required for operation and monitoring of the fuel system.
2. Tank Access Doors (Fig. 2)_________________
A. Access to the inside of the wing fuel tanks is provided by removable access doors located in the wing lower skin. The access doors for the center wing tank are on the center wing front spar.
B. Access doors for the reserve and main tanks are mounted inside the tank and secured in place by inserting screws through a clamp ring into captive nuts in the access door. A molded rubber seal ring fitted into a groove in the door provides a static-type fluid seal between the access door and the wing skin. A phenolic ring bonded to the outer edge of the door adjacent to the rubber seal prevents chafing between the access door and the wing skin. The doors are electrically bonded to the wing structure by the installation of a knitted gasket between the clamp ring and the lower side of the wing skin. Two high impact resistant access doors are installed in main tanks No. 2 and 3 and seven high impact resistant doors are installed in main tanks No. 1 and 4. High impact resistant doors are installed in specific locations and must not be mixed with standard doors.
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