This article presents the application of the ISO 9241-11 Standard to the Flight Simulators Software of the Air Force Argentine to evaluate the usability of these simulators. Each organization and software product are generally different, there is not a "unique" usability test that can be applied to all “software projects.” Highly prestigious companies, such as Apple, Yahoo, and Microsoft, use different usability techniques depending on their specific needs. The main objective of this work is to take the ISO 9241-11 Standard as a reference and then adapt it to the organization´s needs, formulating and implementing metrics that help to evaluate usability objectively and finally contrast, analyze and report the results obtained in this applied research.