![]() ![]() The lower axle stub is usually made from a highly heat-treated nickel alloy steel and machined to close tolerances.The landing gear assembly type D is generally nonrepairable for the following reasons: ![]() ![]() Remove all burrs from the edges of the replacement tube, sleeves, and the original tube stubs. Use the fish mouth sleeve wherever possible. From this outer sleeve tube material, either cut diagonally or fishmouth two sections of tubing, each of such a length that the nearest end of the outer sleeve is a minimum distance of 1½ tube diameters from the end of the cut on the original tube. The clearance between the inside diameter of the sleeve and the outside diameter of the original tube may not exceed 1⁄16-inch. The material selected for the outer sleeve must be of the same material and at least the same wall thickness as the original tube. The replacement tube must bear against the stubs of the original tube with a tolerance of ☑⁄64-inch. Cut a replacement steel tube of the same material, diameter, and at least the same wall thickness to match the length of the removed portion of the damaged tube. In general a large diameter circular tube is the most efficient shape under axial loading.To perform the outer sleeve repair, remove the damaged section of the tube, utilizing a 90° cut at either end. This is probably offset by the fact that a circle would deflect projectiles better. The hexagon may be more resistant to localised impact, particularly if that impact occurs at a corner.
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