There is an increasing trend towards manufacturing fuel tank structures at least partly using composite materials. In such a fuel tank, composite structures are typically fastened to each other and/or to metal structures using metal fasteners. Composite materials are typically much less conductive than metal, at least under the normal operating conditions of a fuel tank. Electric charge which travels on and in a composite structure may arc from the composite structure to an adjacent metal fastener or structure if the current density exceeds the current carrying ability of the joint between the composite structure and the metal fastener/structure.
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