The design of heat exchangers produced through additive manufacturing presents a significant challenge in achieving the goal of net-zero carbon emissions in aviation by 2050. A key advantage of additive manufacturing is its ability to create complex structures that are not feasible using traditional methods. In this context, a collaborative project involving Sogeclair Aerospace, CEA, Addup, and ONERA was launched to develop an initial version of such a heat exchanger. ONERA’s role is centred on characterising the material properties of laser-powder bed fused (LPBF) AlSi7Mg. The forthcoming heat exchanger includes large components, thin-walled tubes, and thin-walls, each of which may exhibit different mechanical properties due to the varying cooling rates inherent to additive manufacturing.