Vacuum-assisted resin transfer molding (VaRTM) is a high-efficiency composite fabricating process. However, materials made using VaRTM have difficulty meeting the performance and quality requirements for applications on primary aircraft structures. Mitsubishi Heavy Industries, Ltd. (MHI), has been developing with Toray advanced vacuum-assisted resin transfer molding (A-VaRTM) technology to overcome the performance and quality shortcomings of VaRTM. MHI demonstrated the feasibility, quality, and consistency of A-VaRTM through trial fabrications and strength tests in 2007. This included the fabrication and structural analysis of a full-scale vertical stabilizer box structure. The results of these tests demonstrated that A-VaRTM technology could be used to make parts for primary aircraft structures. MHI intends to use A-VaRTM technology on the Mitsubishi Regional Jet empennage box structure, and will work toward expanding the application of this technology after the aircraft Type Certificate (TC) is acquired.