With the rising number of Unmanned Aerial Systems (UAS) flying in the sky, an increase in collisions with manned aircraft seems inevitable. Since these devices are permitted to operate in airspace which they share with rotorcraft, a helicopter is certainly not retained from the risk of colliding with a UAS. The only prevailing impact related certification requirement for rotorcraft is the §29.631, which is only applicable to all larger (Part 29) rotorcraft. This requirement states that the rotorcraft must be capable of safe continuation of the flight and/or safe landing after an impact with a 1 kg bird up to the rotorcraft’s maximum horizontal velocity. In this paper, simulations have been performed in explicit Finite Element software to assess how much damage a Part 29 compliant helicopter would sustain after colliding with a UAS. For this purpose, an Agusta A-109 helicopter windshield was impacted by a DJI Phantom III quadcopter UAS under various conditions. The results of the simulations showed that the windshield would sustain severe damage after the impact. Not only would the windshield break into dangerous fragments that could enter the cockpit, parts of the UAS would also penetrate the windshield. These items could strike the crew and a safe continuation of the flight and/or safe landing following the impact cannot be guaranteed. A similar level of safety compared to the bird strike requirement in the prevailing certification requirement is therefore not assured.@en