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AC 43.13-1B 9/8/98 FIGURE 8-12. Location of clamps at tube bends. CAUTION: Purge de-fueled tanks of explosive fuel/air mixtures in accor- dance with the manufacturer’s service instructions. In the absence of such instructions, utilize an inert gas such as CO2 as a purgative to assure the to- tal deletion of fuel/air mixtures. a. Integral Tanks. Examine the interior surfaces and seams for sealant deterioration and corrosion (especially in the sump area). Follow the manufacturer’s instructions for re- pair and cleaning procedures. b. Internal Metal Tanks. Check the ex- terior for corrosion and chafing. Dents or other distortion, such as a partially-collapsed tank caused by an obstructed fuel tank vent, can adversely affect fuel quantity gauge accu- racy and tank capacity. Check the interior sur- faces for corrosion. Pay particular attention to the sump area, especially for those of which sumps are made of cast material. Repairs to the tank may be accomplished in accordance with the practices outlined in the chapter 4, Metal Structure, Welding and Brazing of this AC. c. Removal of Flux After Welding. It is especially important, after repair by welding, to completely remove all flux in order to avoid possible corrosion. Promptly upon completion of welding, wash the inside and outside of the tank with liberal quantities of hot water and then drain. Next, immerse the tank in either a 5 percent nitric or 5 percent sulfuric acid solu- tion. If the tank cannot be immersed, fill the tank with either solution, and wash the outside with the same solution. Permit the acid to re- main in contact with the weld about one hour and then rinse thoroughly with clean water. Test the efficiency of the cleaning operation by applying some acidified 5 percent silver nitrate solution to small quantity of the rinse water used last to wash the tank. If a heavy white precipitate is formed, the cleaning is insuffi- cient and the washing should be repeated. d. Flexible Fuel Cells. Inspect the inte- rior for checking, cracking, porosity, or other signs of deterioration. Make sure the cell re- taining fasteners are properly positioned. If repair or further inspection is required, follow the manufacturer’s instructions for cell re- moval, repair, and installation. Do not allow flexible fuel cells to dry out. Preserve them in accordance with the manufacturer’s instruc- tions. 8-33. FUEL TANK CAPS, VENTS, AND OVERFLOW LINES. Inspect the fuel tank caps to determine they are the correct type and size for the installation, and that “O” rings are in good condition. a. Unvented caps, substituted for vented caps, will cause fuel starvation and possible collapse of the fuel tank or cell. Malfunction- ing of this type occurs when the pressure within the tank decreases as the fuel is with- drawn. Eventually, a point is reached where the fuel will no longer flow, and/or the outside atmospheric pressure collapses the tank. Thus, Page 8-20 Par 8-32PDF Image | AFS-640
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