(3)
All fuel tanks are fluid tight. Close metal-to-metal fit of all parts forms the basic seal. Sealing compounds and sealed fasteners are used on all joints to complete the fluid tight seal.
D. No. 1 and No. 2 Tanks
(1)
The No. 1 tank (left wing) and the No. 2 tank (right wing) are found in the interspar area of each wing. Two of the wing ribs contain a series of baffle check valves to prevent fuel flow away from the boost pumps.
(2)
Access panels on the wing lower surface supply access to each tank. Access openings in the tank ribs are supplied for areas not accessible directly through the access panels.
(3)
An overwing fill port, found on the upper wing surface, permits gravity-feed fueling if pressure fueling equipment is not available.
E. Center Tank
(1)
The center tank is contained in the fuselage. It is divided into three cavities by spanwise beams. The cavities are numbered 1, 2 and 3 starting with the forward cavity. The spanwise beams contain fuel flow equalizing holes to permit flow of fuel between the beams.
(2)
An access panel in the lower left surface of cavity No. 1 supplies access to the center tank. Man-size openings in the spanwise beams supply access between the cavities.
(3)
The center tank has a secondary external barrier coating on the upper panel and front spar to prevent fuel vapor from entering the pressurized section of the fuselage.
F. Surge Tank
(1) A surge tank found outboard of each fuel tank in the wing contains any fuel overflow from the tanks and supplies tank venting. A surge tank drain check valve lets the fuel overflow drain back into the center tank but prevents fuel flow from the center tank to the surge tank.
2. Fuel Tank Access Panels (Fig. 2)
_______________________
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
ACCESS PANEL
ACCESS PANEL ATTACHMENT
1
NOT INSTALLED ON MOLDED
(EXAMPLE)
ALUMINUM HONEYCOMB DOOR
Tank Access Panels Figure 2
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ALL ú ú 02 Page 3 ú Nov 15/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
3.
4.
5.
A
737-300/400/500MAINTENANCE MANUAL
A. Access panels permit entry into the airplane fuel tanks for inspection or component repair. The access panels are cast aluminum or molded aluminum honeycomb and are installen in the tank. The panels are installed by inserting screws through a clamp ring on the outside, flush with wing panel and threading the screws into captive nuts in the access panel. A molded rubber seal ring, fitted into a groove in the panel seal face, supplies a static-type fluid seal between the access panel and the wing skin. Fuel tank access panels are electrically bonded to the wing structure by coating the gasket and clamp ring with anticorrosion grease.
B. The center tank has one access panel. The No. 1 and No. 2 tanks have 12 access panels each. In addition, two smaller panels in each wing supply access to the fuel boost pumps.
C. AIRPLANES WITHOUT SB 737-28A1131; Each surge tank has two access panels; a circular access panel with an air scoop and an oblong access panel.
D. AIRPLANES WITH SB 737-28A1131; Each surge tank has two access panels. There is a circular access panel with an air scoop and an in-the-tank flame arrestor. There is an oblong access panel with an in-the-tank pressure relief valve. The flame arrestor decreases the possibility of a flame going into the fuel tank through the fuel vent system. If the flame arrestor is clogged, the pressure relief valve will release the pressure or vacuum from the fuel tank. This will prevent damage to the wing.
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