OVERVIEW OF NASA RESEARCH RELATED TO THE AGING COMMERCIAL TRANSPORT FLEET

This article describes the research activities of the NASA airframe structural integrity program for the aging commercial transport fleet. Advanced analysis methods are under development to predict the fatigue crack growth in complex built-up shell structures. Innovative nondestructive examination technologies are under development to provide large-area inspection capability to detect corrosion, disbonds, and fatigue cracks. The ultimate goal of this interdisciplinary program is to develop and transfer advanced technology to the airline operators and airframe manufacturers. This program is being conducted cooperatively with the FAA and the U.S. industry.