Aircraft wing design using Multidisciplinary Design Optimization (MDO) techniques is a complex task which involves different disciplines, mainly aerodynamic and structure. The multidisciplinary feasible (MDF) method is a new MDO approach and it involves solving a single optimization problem that calls a multidisciplinary analysis (MDA) when objective or constraint values are required. this paper is to optimize the range of a regional jet aircraft using a monolithic MDO technique Multidisciplinary Feasible (MDF). Thus, this research optimized the Bombardier CRJ700 wing and maximization of Breguet range was chosen as objective function and two design variables, as spare thickness from structure part and twist angle from aerodynamic part, were mentioned. Finally, the results demonstrated that the flight range was sharply increased around 41%.

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