Abstract: A method and apparatus for testing the integrity of the dielectric coating on an elongated member. The apparatus includes a pair of opposing, conducting surfaces that can be biased against the dielectric surface, a source of high voltge that can be switchably imposed on the conducting surfaces, a ground for completing an electrical circuit between the elongated member and the source of high voltage, and an electrical circuit for detecting the passage of current through the electrical ground. A first visible indicator on the apparatus shows when the high voltage is applied to the conducting surfaces and a second visible indicator shows when a current is detected through the electrical ground. This apparatus allows the conducting surfaces to be moved longitudinally along the elongated member to test the dielectric integrity of virtually the entire dielectric surface in a single pass.

Abstract: A tubing inside an aircraft fuel tank is encircled by a dielectric support and wear sleeve that is comprised of two members that are clamped together circumferentially around the tubing. The members include projecting portions having an adhesive applied thereto along mating surfaces to rigidly couple the support sleeve members to each other. The mating surface is a circumferential arc that provides complete overlap of a portion of the two support sleeve members. The adhesive extends circumferentially along the mating surface to provide sufficient dielectric strength due to the extended length of the adhesive coupling. The tubing and sleeve are supported by a support assembly including a clamp, bracket and tank wall. The sleeve material has the necessary thickness and length to provide dielectric isolation of the tube from the support assembly. The sleeve is designed having tight tolerances along the outside diameter to permit axial motion with respect to the clamp while restraining radial motion.