STS-74 
          was the first Space Shuttle mission to actually help build a space station. 
          Its payload included two solar arrays and a module essential for future 
          dockings of the Russian space station and the U.S. Shuttle.
        For the first Shuttle-Mir docking (STS-71), the Russian cosmonauts, 
          with the aid of the Lyappa manipulator arm, relocated the Kristall module 
          to allow ample clearance for Atlantis. After the Orbiter departed, 
          the Mir crew had to return the Kristall to its original location to 
          provide Russian Soyuz and Progress vehicles access to the station. 
        To avoid future movements of the Kristall, STS-74 ferried a Russian-built 
          docking module and Orbiter docking system to Mir for installation. The 
          new mechanism would provide the means to effect Shuttle dockings without 
          interference.
        STS-74's journey was delayed one day as the crew waited for weather 
          to clear at a transAtlantic emergency landing site. Soon after reaching 
          orbit, the crew began setting up for business.
        On Flight Day 1, the astronauts powered up the docking module, which 
          was stowed on its side inside the Shuttles payload bay. On Flight Day 
          2, they examined the robotic arm and installed a guidance camera in 
          the Shuttles docking system. On Flight Day 3, astronauts Chris Hadfield 
          and Bill McArthur used the robot arm to grapple the docking module, 
          swing it out of the payload bay, and position it on the end of the docking 
          system at a right angle out of the payload bay. Commander Ken Cameron 
          and Pilot Jim Halsell then fired Shuttle thrusters to "bump" 
          the docking assemblies together. 
        After checking for leaks, the crew entered the docking module and moved 
          the guidance camera to help in docking with Mir.
        Flight Day 4 marked the second Shuttle-Mir docking. Commander Cameron 
          did not have the good view that STS-71 Commander Hoot Gibson had enjoyed 
          during the inaugural docking of the two spacecraft. Stacked together, 
          the combined docking assembly and module measured almost 20 feet. According 
          to Cameron, it was "like looking at the top of a building from 
          the ground floor. You can see that its up there but you really cant 
          . . . accurately judge position or orientation." For the successful 
          docking, Cameron and his crew used several aids, including the camera 
          inside the docking module, another camera on the outside of the module, 
          a "wrist" camera on the robot arm, and a laser system that 
          worked in conjunction with a series of reflectors mounted on Mirs Kristall 
          module.
        During the three days of docked operations with Mir, Atlantis 
          took onboard U.S., Russian, and European Space Agency equipment and 
          samples. The crew delivered water, supplies, and equipment, including 
          the two new solar arraysone Russian built and one built in the U.S. 
        
        Mirs residents at the time were Commander Yuri Gidzenko, Flight Engineer 
          Sergei Avdeyev, and Cosmonaut Researcher Thomas Reiter of Germany.
        This mission marked the first time astronauts from the U.S., Russia, 
          Canada, and the European Space Agency (ESA) were in space on the same 
          complex at one timean example of future international cooperation.
        Atlantis lingered near Mir and made two fly-arounds at a distance of 
          about 400 feet while the crew filmed Mir with the large-format IMAX 
          camera.
        
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          more about the STS-74 mission and crew.