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Two-dimensional models have been developed to predict and reproduce ice accretion shapes on airfoil profiles. These simulated shapes mostly are similar to experimental forms. However, in some conditions, the ice shapes could present some discontinuity along span showing some ice deposit separated by air inclusion: this deposit is called “lobster tail” or “scallop icing”. The classical 2D approaches fail to predict this kind of ice shapes. The 3D simulation requires to take into account a fully detailed heat and mass balance parameters which scallop accretion is sensitive. For that, the scallop formation was experimentally led on the swept cylinders. An experiment in the icing wind tunnel PAG of the CEPr (The French Engine Test Center) was conducted in order to characterize the phenomenon and find the most relevant criteria. The ice accretions were obtained at different conditions.