The damaged area (crack) needs to be stop drilled or the damage must be removed. Cracks can develop around flanged lightening holes, and these cracks need to be repaired with a repair plate. The holes are flanged to make the web stiffer. Repair of Lightening HolesAs discussed earlier, lightening holes are cut in rib sections, fuselage frames, and other structural parts to reduce the weight of the part. Remove the burrs from the rivet holes and apply corrosion protective material to the contacting surfaces before riveting the patch into place. Then, from the back side and through the original holes, locate and drill the remaining holes. Using a hole finder, locate the position of a second hole, drill it, and insert a second fastener. Place the patch plate in its correct position, drill one rivet hole, and temporarily fasten the plate in place with a fastener. Turn the edges downward slightly so that the edges fit closely. At the corners, strike arcs having the radius equal to the edge distance.Ĭhamfer the edges of the patch plate for a 45° angle and form the plate to fit the contour of the original structure. Cut the patch plate from material of the same thickness as the original or the next greater thickness, allowing an edge distance of 21⁄2 rivet diameters. Lay out the new rivet row with a transverse pitch of approximately five rivet diameters and stagger the rivets with those put in by the manufacturer. For relief of stresses at the corners of the trim-out, round them to a minimum radius of ½-inch. Trim out the damaged portion to the allowances mentioned in the preceding paragraphs. The procedures for making all three types of panel repairs are similar. The repair procedure for the other edges of the damage follows the previously explained methods. Inside the MemberFor damage that, after being trimmed, has less than 81⁄2 manufacturer’s rivet diameters of material inside the members, use a patch that extends over the members and an extra row of rivets along the outside of the members.Įdges of the PanelFor damage that extends to the edge of a panel, use only one row of rivets along the panel edge, unless the manufacturer used more than one row. NOTE: Blind rivets should not be used on floats or amphibian hulls below the water line. Inspection of floats and hulls involves examination for damage due to corrosion, collision with other objects, hard landings, and other conditions that may lead to failure. If the necessary information is not found in the SRM, attempt to find a similar repair or assembly installed by the manufacturer of the aircraft.įloatsTo maintain the float in an airworthy condition, periodic and frequent inspections should be made because of the rapidity of corrosion on metal parts, particularly when the aircraft is operated in salt water. Any additional knowledge needed to make a repair is also detailed. Normally, a similar repair is illustrated, and the types of material, rivets, and rivet spacing and the methods and procedures to be used are listed. When repairing a damaged component or part, consult the applicable section of the manufacturer’s SRM for the aircraft. This section describes typical repairs of the major structural parts of an airplane.
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