New, eco-efficient aircrafts are challenged by a demand to significantly reduce the CO2 and NOx emission. To achieve these goals, new configurations are being explored for integrating advanced engines and propulsion concepts to the aircraft. Most of such promising concepts as the Counter-Rotative Open Rotor (CROR) engine, Boundary Ingestion Layer (BIL), Ultra High Bypass Ratio engines (UHBR) and multiple fan cannot be targeted simply by replacing engines of the current generation, but require a substantial change of the principle aircraft configuration. In case of un-ducted engine architecture as the CROR, the rearward shift of the engines away from the wing provides additional advantages in cabin noise and passenger comfort and safety improvement. Regarding safety, main issue is the CROR engine debris that can be release with high energy when there is a failure. It is mandatory to develop innovative solutions for panels and shielding able to shield and reduce damage at impact, to secure the airframe integrity, so that aircraft can make safe continuation of flight and landing after engine burst event.