1 Wing Planform Optimization of a Transport Aircraft Paulo Ferrucio Rosin Bento Silva de Mattos Empresa Brasileira de Aeronáutica SA – Embraer Av. Brigadeiro Faria Lima, 2170 12227-901 São José dos Campos – São Paulo - Brazil Roberto da Mota Girardi Pedro Paglione Aeronautical Institute of Technology (ITA) São José dos Campos – São Paulo - Brazil Abstract The present work deals with multi-disciplinary design and optimization (MDO) of a transport aircraft wing. The aircraft must fulfil a given mission requirements under restrictions imposed by different aeronautical disciplines. The mathematical model of the MDO framework includes the calculation of aircraft drag polar (based on geometrical characteristics), engine trust, aircraft structural weight, volume available for fuel tank (which is stored only in the wings), stability derivatives, and performance for some flight phases. MATLAB ® was used then to implement build the related computational routines. Some design tasks for a twinjet aircraft, carrying eight passengers and a crew of three, were carried out for some specified maximum ranges and the results are analyzed here. 22nd Applied Aerodynamics Conference and Exhibit 16-19 August 2004, Providence, Rhode Island AIAA 2004-5191 Copyright © 2004 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.