This paper endeavors to identify some of the requirements for the propulsion system of the advanced technology transport. These requirements lie in the areas of design, material selections, accessibility and maintainability of the system, and noise and emission control. The design should provide for adequate stall margins for the compressor, maximum reliability, mechanical and operational simplicity whenever possible, and a modular type of assembly to facilitate on-line and on-wing maintenance. The airframe manufacturer must engineer the powerplant installation to provide maximum accessibility to the engine gas path hardware and the engine accessories. The engine designers must strive for noise levels within the state-of-the-art and preferably below the FAR 36 compliance requirements. The engine should be optimized to produce the minimum possible amount of noxious gases, particulates, and unburned hydrocarbons.