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KENNEDY SPACE CENTER, FLA. -- In the Space Station Processing Facility, overhead cranes lower the Mobile Base System onto the weight and center of gravity stand. Part of the payload on mission STS-111 to the International Space Station, the MBS will be installed on the Mobile Transporter to complete the Canadian Mobile Servicing System, or MSS. The mechanical arm will then have the capability to "inchworm" from the U.S. Lab Destiny to the MSS and travel along the truss to work sites. STS-111 is the second utilization flight (UF-2) to the Space Station and will also carry the Expedition 5 crew to replace Expedition 4. Launch is scheduled for May 31, 2002