A Space Launch System (SLS) avionics handling tool demonstration takes place inside Kennedy Space Center’s Vehicle Assembly Building on April 4, 2019. The demonstration showed that avionics boxes could be successfully and safely mounted into the SLS rocket’s upper stage — called the Interim Cryogenic Propulsion Stage, or ICPS — with low risk of damaging a closely located hydrazine tank. Avionics boxes include the Inertial Navigation and Control Assembly and flight batteries. The actual installation will take place just weeks before NASA’s SLS rocket and uncrewed Orion spacecraft lift off on Exploration Mission-1 from Launch Pad 39B at Kennedy.