his paper proposes a framework to describe CAD modellers' integration into MDAO environments for use in the conceptual design phase. This paper also formalizes the interactions between the disciplines and a CAD modeller within MDAO workflows and provides requirements for automated systems and subsystems analyses.Therefore, the presented work enables integrating novel disciplines, such as thermal, maintenance, safety, and electromagnetic compatibility (EMC) analyses, into the aircraft conceptual design phase. A case study covering the thermal analysis of an aircraft equipment bay demonstrates the effectiveness of the proposed MDAO framework.