STS-74

STS-74 was the fourth mission of the US/Russian Shuttle-Mir Program, and the second docking of the Space Shuttle with Mir. The shuttle delivered a pair of solar arrays along with the Russian-built Mir Docking Module to allow docking with the station by the space shuttle without moving Mir's Kristall module. During the three-day docking, the Russian, Canadian, and American crew transferred supplies and equipment between Atlantis and Mir, moved several long-term experiments, and upgraded the station with new equipment, particularly during the installation of the docking module.