An Inertial particle separator (IPS) is situated in the aircraft engine's intake to prevent the Foreign Object Debris (FOD) from entering the compressor. An IPS consists of two types of outlets: core and scavenge. The goal is to navigate particles into the scavenge outlet, which is implemented by a rapid change in flow direction. Therefore, particles separate from the core outlet by their inertia. IPS performance is measured by the separation efficiency, calculated as the mass of particles leaving the scavenge outlet over the total mass of particles leaving both outlets. Connolly et al. [1] present experimental data for a wide range of flow path designs and test dust for an IPS device, which was proposed first by Barone et al. [2]. These data can be used for validation purposes. An IPS can face ice accretion due to the impingement of supercooled water droplets on its inner surface. The effects of the droplet diameter, liquid water content, and incoming velocity on ice accretion are studied by Qui et al. [3], and the results show that ice accretes on the windward side of the hub, the bent surface of the shroud, and the leading edge of the splitter. This work aims to investigate the IPS performance affected by ice accretion created by water impingement inside IPS using Computational Fluid Dynamics (CFD). Therefore, the particle separation efficiency will be analyzed for different particle distributions within different scavenge-to-inlet mass flow rate ratios. The separation efficiency is expected to decrease due to the generation of ice in the way of the scavenge outlet. REFERENCES [1] B.J. Connolly, E.Loth and C.F. Smith, Efficiency of inertial particle separators. Pow- der Technology., Vol. 413, p. 118004, 2023. [2] D. Barone, E. Loth and P. Synder, Influence of particle size on inertial particle separator efficiency. Powder Technology., Vol. 318, pp. 177-185, 2017. [3] C. Qiu, N. Chen, Y. Hu, B. Wang and S. Hu, Numerical study of ice accretion inside an inertial particle separator. AIP Advances., 12(5), 2022