F.  Install Fuel Tank Access Panel (No. 14)
(1)  
Position seal ring gasket on access panel outer flange ensuring that mounting screw holes in panel and gasket match all the way around. Insert a few mounting screws to hold gasket in place.

NOTE: Mounting screw holes in access panel are not symmetrically spaced.

(2)  
Guide air vent stack through opening in wing and align access panel mounting screw holes with matching holes in wing opening. Engage a few mounting screws to hold panel and gasket in position.

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L86993
Access Panel Mount Bolt Torque Pattern  538 
28-11-11  Figure 402  May 01/01 
Page 406 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

(3)  Install remaining mounting screws and tighten all screws evenly to a torque range of 63 to 77 pound-inches.
NOTE:  On airplanes with a vent scoop flame arrestor, the surface of the vent scoop access panel protrudes 0.06 inch ± 0.02 inch out from the surface of the airplane skin when the access panel is installed correctly. This acceptable misfairing is permitted because of the increased weight of the access panel with the flame arrestor installed.
L87310
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May 01/03  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  28-11-11 Page 407/408 

WING FUEL SUMP DRAIN VALVE - REMOVAL/INSTALLATION
1. General
A.  Fuel sump drain valves are installed in either riveted housings or in shrink-fit bushings inserted into the wing lower skin (Fig. 401). Mating threads of valve and housing (or bushing) are protected against galling by a factory-applied, baked-on coating of dry film lubricant. If valve removal and installation is necessary, care should be exercised to protect threads from damage.
2.  Equipment and Materials
A.  Sump Drain Valve Removal Tool - B28001-1 (preferred); SE28-1103 (alternate)
B.  Cleaning Solvent - Aliphatic Naphtha TT-N-95 (Ref 20-30-31)
3.  Remove Fuel Sump Drain Valve (Fig. 401)
A.  Insert drain valve tool into valve assembly making certain that hexagonal surfaces of tool engage with valve body.
B.  While exerting an upward force on tool to prevent fuel leakage, unscrew and remove valve body from valve boss. Discard O-ring seal.
4.  Install Fuel Sump Drain Valve (Fig. 401)
A.  Wash drain valve in solvent until screen and drain valve are free of al1 foreign material.
B.  Check drain valve threads for presence of dry film lubricant.
(1)  Replace valve which does not have dry film lubricant intact.
C.  Lightly lubricate new O-ring seal with fuel and position O-ring on drain valve.
D.  Hand start threaded engagement of valve into housing or bushing using care to avoid cross-threading.
E.  Insert sump drain valve tool into drain portion of valve assembly taking care to engage hexagonal surfaces of tool with mating valve surfaces.
F.  Maintaining an upward force on tool to prevent fuel leakage, screw drain valve assembly into valve boss. Tighten to 200-300 pound-inches.
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Jun 20/85  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  28-11-21 Page 401 

G43271
Fuel Sump Drain Valve Installation (Typical)  538 
28-11-21  Figure 401  Jun 20/88 
Page 402 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

INTEGRAL CENTER TANK ACCESS PANEL - REMOVAL/INSTALLATION
1. General
A.  An access panel is provided in the center wing cavity to allow personnel to enter the center wing fuel tank for maintenance. The cavity access opening is located in the lower skin (Fig. 401).
B.  The tank access panel is cast aluminum and provides a primary fluidtight seal by use of a molded rubber seal fitted into a groove on the panel mating surface. A phenolic strip is bonded to the outer edge of the panel to prevent chafing of lower wing skin. A clamp ring is used to distribute the attaching bolt load and protect the outer lip in the skin opening. A bonding jumper is used to electrically ground the panel to the structure. A secondary seal is provided by an application of sealant material over the heads of all attaching bolts and as a fillet around the inner and outer edges of the clamp ring after each installation of the panel.
　
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