Afterward, Zarya is used as a passageway, stowage facility, docking port and fuel tank.
Unity provides six docking ports, one on each side.
With Zarya permanently attached to one of those, the remaining five will serve as attach points , to which all future U.S. modules will be joined. Aboard was 2,000 pounds of supplies and logistics to prepare the orbiting facility with equipment that eventually will be used by crews that live aboard for long durations. It was the second shuttle mission dedicated to the assembly and outfitting of the station. It s cargo included more than 2,000 pounds of supplies and equipment to extend the lifetime of the Zarya module. During the mission, four of six batteries and associated electrical components were swapped to restore the electrical power system to full redundancy.