An evaluation of repairs to in-service commercial transport aircraft has identified the need to investigate the interacting effects of structural repairs in close proximity. Structural repairs are required for damage resulting from fatigue crack growth, corrosion and accidental events. The project sets out to establish the design philosophy for a variety of common repair arrangements, in close proximity to each other, and to assess the adequacy of structural integrity methodology. The paper summarises the results of the analysis for multiple repair configurations on aircraft fuselage and wings. Recommendations related to repair geometry and modifications to fatigue and damage tolerance analysis, to cater for reduction in life predictions, are proposed.
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