5A6 Integral Fuel Tank Location
Feb 20/90 Figure 1 28-11-0
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BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
B63694
5A6 Fuel Tank Access Panels
Feb 20/90 Figure 2 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 28-11-0 Page 3
3. Rib and Spanwise Beam Access Openings (Fig. 3)
A. Rib Access Openings
(1) Access to some of the equipment located inside the fuel tanks is not directly possible through the fuel tank access panels. To obtain access to this equipment, personnel must enter the tank through the nearest access panel and go through rib access openings into the areas between ribs where no access panel is provided. The access openings in ribs installed at wing buttock lines (WBL) 135.5 and 183.4 are covered by access panels which must be removed to allow entry into otherwise inaccessible areas within the wing. The panels must be reinstalled once work within these areas is complete.
Rib Access Openings 539
28-11-0 Figure 3 Feb 20/84
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BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
B. Spanwise Beam Access Openings (Integral Center Tank)
(1) Spanwise beam access openings provide access between cavities. There are no baffle panels installed on the openings.
4. Filler Cap Assembly
A. The filler caps seal the filler ports that are utilized during overwing fueling operations. Each cap assembly consists of a flush fitting cap with a locking device and an adapter which is the exterior filler port (Fig. 4).
B. The filler cap assemblies are located on top of the wing. The filler cap is attached to the adapter on the exterior filler port by rotating the cap clockwise to a stop, this compresses the O-ring, in the cap, against the inside of the adapter to seal the filler port opening.
C. Filler ports and caps are provided for fuel tanks No. 1 and 2 only.
5. Baffle Check Valves
A. Baffle check valves are installed in No. 1 and 2 fuel tanks at the bottom of the ribs at wing buttock line 157.0, 227.0 and 557.0. When the airplane is in a nose high or a wing low attitude, the baffle check valves reduce the rate of fuel flow toward the wing tips thereby maintaining fuel in the boost pump area of the wing and improving airplane trim stability. Each baffle check valve is hinged at the top and opens in the inboard direction only. The valve flapper is free swinging and aligns itself automatically with the valve seat when it closes (Fig. 5).
539
Feb 20/84 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 28-11-0 Page 5
Fuel Tank Filler Cap Assembly 535
28-11-0 Figure 4 Feb 15/72
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BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
B. Access to the four baffle check valves at the bottom of the rib at wing buttock line 157.0 is obtained through fuel tank access panel No. 1 and rib access opening No. 3. Access to the four baffle check valves at the bottom of the rib at wing buttock line 227.0 is obtained through fuel tank access panel No. 3. Access to the one baffle check valve at the bottom of the rib at wing buttock line 557.0 is obtained through fuel tank access panel No. 13.
500 Baffle Check Valves
May 15/77 Figure 5 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 28-11-0 Page 7
6. Fuel Sump Drain Valve
A. Fuel sump drain valves are installed at the low points of the fuel and fuel surge tanks for draining accumulated moisture from each tank and for draining trapped fuel remaining after defueling. The sump drain valves used for the tank No. 1 and 2, including surge tank sump drains, are different than the sump drain valve used for the integral center tank. (See figure 6.)
(1)
The sump drain valves, used for tanks No. 1 and 2, including surge tanks, are spring-loaded closed, poppet-type valves flush mounted in the wing lower skin. A screen over the valve inlet protects the unit from contaminants which may block the drain passages. The valve incorporates a flapper valve which allows the poppet assembly to be removed without draining the fuel tank. To drain the fuel sump, the poppet is pushed up to Open the valve and allow fuel to drain through the drain hole in the center of the valve. A 9/16-inch tube may be used to push up on the poppet to facilitate draining fluid into a container.
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