FENSAP-ICE can calculate 3D glaze, rime or mixed-type ice shapes on any aircraft surface, for any icing condition. It has a built-in graphical interface to facilitate selection of icing conditions from Appendix C, D, and O. The ice shapes on wings, stabilizers, control surfaces, air data probes, rotors and propellers, turbofan blades and passages, radomes, cameras, etc. can be used to assess performance degradation. Icing on intake screens can be used to calculate blockage effects. Various roughness models are provided, including an analytical model that eliminates dependence on empirical correlations. Large glaze horns can be simulated in 2D and 3D with Multishot. The Extended Icing Data option enables simulation of “beak” ice shapes that grow when the stagnation temperature is above freezing