For the exploration and validation of the integration of efficient propulsion concepts and new technologies for future large passenger aircraft it is necessary to establish suitable design, evaluation and measurement tools. Therefore, as one major activity of the Large Passenger Aircraft (LPA) Platform 1 of the Clean Sky 2 initiative the so-called Cross-Capability-Demonstrator (XDC) has been set up to develop and demonstrate powerful numerical and experimental methods for aerodynamic, aeroacoustics and aeroelastic simulation and measurement tasks. The paper will give an overview of the activities to be performed within the XDC and present some of the latest achievements related to this demonstrator