3D printed parts for the C-5M deliver new capabilities Published March 1, 2023 By Lan Kim 60th Air Mobility Wing Public Affairs TRAVIS AIR FORCE BASE, Calif. -- Maintainers from the 60th Maintenance Squadron and 349th Aircraft Maintenance Squadron, along with Engineering and Engineering Support contractors from the C-5 System Program Office out of Robins AFB, Georgia, began maintenance last month to modify an aerodynamic fairing for a C-5M Super Galaxy by incorporating printed 3D parts. Airman from the 60th Maintenance Squadron and 349th Maintenance Squadron, prepare the wing surface of a C-5M Super Galaxy for maintenance at Travis Air Force Base, California, Jan. 31, 2023. Maintainers from the 60 MXS and 349 MXS modified an aerodynamic fairing over a wing splice of a C-5M Super Galaxy incorporating newly printed 3D parts known as blocks and wedges. (U.S. Air Force photo by Lan Kim) Photo Details / Download Hi-Res The printed blocks and wedges, supplied by the USAF Rapid Sustainment Office, provide internal support to the C-5 hump panel covering a wing splice, as described by Clay Elliott, a C-5 structural engineering subject matter expert with the C-5 SPO. When a Travis C-5M landed in Charleston AFB, South Carolina, during a mission in December, the crew discovered during a post-flight inspection that a section of the hump panel was missing. “The technicians went up on the wing, and that's when they discovered that there was a massive delamination of the phenolic (blocks),” Elliott said. The blocks provided internal support to the C-5 hump panel which allowed proper aerodynamics over the wing, and in this instance, made the aircraft non-mission capable. To get the aircraft fixed as soon as possible, Elliott proposed to integrate the 3D printed parts made from Antero 800NA, a new thermoplastic material, into the aircraft repair. U.S. Air Force Staff Sgt. Timothy Jones, 60th Maintenance Squadron aircraft structural maintenance supervisor, left, monitors Senior Airman Andrew Serrato, 349th Aircraft Maintenance Squadron aircraft structural maintenance journeyman, as he prepares a fastener strap at Travis Air Force Base, California, Jan. 31, 2023. The strap was fitted with newly 3D printed blocks meant for maintenance on a C-5M Super Galaxy. (U.S. Air Force photo by Lan Kim) Photo Details / Download Hi-Res After a team of maintainers fixed the panel at Charleston, the aircraft was flown back to Travis for further maintenance. The process involved completely removing the legacy parts from the plane and re-bonding the new 3D printed blocks and wedges to the aircraft and re-installing the panels. “It’s pretty intense work with regard to getting all this stuff off, then getting it clean without causing damage,” Elliott said. According to Elliot, the Antero material has shown promising results and the material appears to be impervious to natural elements. “For what we're doing, 3D printed Antero seems to be a really solid replacement for phenolic,” Elliott said. “All the aircraft we've worked on so far with these improved materials and processes—we’ve haven't had any issues.” Todd Hicks, 60th MXS Aircraft structural maintenance supervisor, highlighted how the new technology has expedited some C5-M maintenance and repairs. Integrating 3D printing technology resulted in faster turnaround times and reduced costs. It helps to provide the option for the 60 MXS to produce some parts on demand, rather than go through the lengthy process of sourcing parts from third parties, if a part is unavailable locally. Traditionally, spare parts for the C-5M have been expensive and time-consuming to produce, as they required specialized tooling and long lead times. However, the use of 3D printing has allowed for the creation of these parts in a more efficient manner, Hicks said. “Hopefully, this is a one and done and it works great so we never have to revisit this again from the aircraft,” Hicks said. He emphasized how thousands of maintenance hours could be saved once the whole fleet of C-5s receives the new 3D blocks and wedges. The integration of 3D printing technology into the maintenance and repair of the C-5M has had a significant impact for the U.S. Air Force. Faster repair times and the potential for cost savings have all combined to make the aircraft more operationally ready and cost-effective, Elliot said. To learn more about how the U.S. Air Force is innovating with 3D printing and additive manufacturing, visit: https://www.aflcmc.af.mil/RSO-AMPO/.