Abstract: Significant progress has been made in the research and development of boundary layer ingesting (BLI) propulsors which studies and high fidelity analyses have predicted will have a four percent reduction in fuel burned for large transport class subsonic cruise aircraft. Funded by NASAs Advanced Air Transport Technology (AATT) Project, this work has necessarily comprised the efforts of inlets, turbomachinery, aeromechanics, nozzles, propulsion airframe integration and acoustics technical discip…