Current military conflicts have created the need for an effective light attack aircraft like turboprops that are able to perform this kind of mission at a lower cost than existing combat aircraft. The reappearance of this type of aircraft makes necessary that the operative costs diminish and performance be improved, that is why this work centers in evaluating the sensitivities of the aircraft type LAAR, provided by the software AAA (Advanced Aircraft Analysis 3.19) and Roskam’s books “Airplane Design” (Roskam, 1985); based in this information it is possible to begin to design an airplane according to the requirements of the aircraft type LAAR.