Recent aircraft incidents and accidents have highlighted the existence of icing cloud characteristics beyond the actual certification envelope defined by the JAR/FAR Appendix C, which accounts for an icing envelope comprising water droplets up to a diameter of 50 μm. The main concern is the presence of SLD (Supercooled Large Droplets), with droplet diameters well beyond 50 microns. In a previous European-funded project, EURICE, in-flight icing conditions and theoretical studies were performed to demonstrate the existence of SLD and to help characterize SLD clouds. Within the EXTICE project the problem of SLD simulation is addressed with both numerical and experimental tools is being addressed. In this paper the objectives and main achievements of the EXTICE project will be described. EXTICE is a European-funded project with the participation of CIRA, Alenia Aeronautica, ATR, DGA Aero-engine Testing (former CEPr), Cranfield University, Dassault, Technisch Universität Darmstadt, INTA, ONERA, Piaggio, University of Naples, University of Twente, Airbus and Eurocopter.