The continuous development of lightweight aircraft’s structures and the need to continuously improve the passive safety for passengers, raise the need of innovative structural solutions and devices for impact energy absorption to protect the occupants. The adoption of lightweight and highly energy-absorbing devices is essential to meet these demands and sandwich structures made using Additive Manufacturing techniques can be effectively introduced in key points of the structure, such as below the passenger seats, as devices with passive safety purposes. Such kind of devices make it possible to combine compactness and lightness with the capability of absorbing high amount of impact energy by triggering plastic deformation and failure mechanisms. In this work, the crashworthiness performances of a composite fuselage barrel section from a regional aircraft have been investigated with the main aim of proposing and analysing the introduction of new passive safety components. In detail, sandwich structures with lattice cores have been added below the seats as devices to improve the passive safety in case of a crash and reduce the loads transmitted to the passengers. A detailed numerical model of the fuselage barrel section structure and of the energy absorbing devices have been developed in the finite element software Ls-Dyna to numerically simulate the drop test phenomenon. A numerical Anthropomorphic Tesh Device has been considered inside the structure and placed on the seat to analyse the accelerations and loads suffered during the impact phenomenon. The effectiveness of the proposed structural solutions for improving aircraft passengers safety has been investigated by analysing and comparing data recorded by the dummy in the structure without and with the passive safety devices.