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Question 3 - A stringer was found damaged and has been repaired by the installation of a splice as shown in the diagram. The " L " section is 40 mm by 40 mm and 1.4 mm thick. 3.1 State the repair basic principles in terms of the doubler materials, doublers thickness, rivets' edge distance, rivets' spacing.
3.1 State the repair basic principles in terms of the doubler materials, doublers thickness, rivets' edge distance, rivets' spacing. (10 marks) CONFIDENTIAL 3.2 Calculate the strength of the splice or doubler (load carrying capability) and Margin of Safety. The "L" angle is Aluminum Alloy 2024-T3 (Ultimate Tensile Strength is 480MPa ). The "L" section is 40 mm by 40 mm and 1.4 mm thick. Draw the repair diagram showing the cross-section of original and doubler Doubler thickness Doubler cross-sectional area (show calculation) Doubler strength (show calculation) Margin of Safety Show calculation