STS-111 PAYLOADS
International Space Station Flight UF-2

Payload Bay

Mobile Remote Servicer Base System
The Mobile Remote Servicer Base System, or MBS, is the second part of the International Space Station's three-piece Mobile Servicing System. The MBS is a work platform that moves along rails on the International Space Station's Integrated Truss Structure. It will provide lateral mobility for Canadarm2, the station's robot arm, as it traverses the main trusses.

The MBS is slated to be attached to the Mobile Transporter on Flight Day 6. STS-111 spacewalkers will make power, data and video cable connections and bolt it to the transporter during the mission's second spacewalk on Flight Day 7. On Flight Day 8, the MBS will be checked out.

Leonardo
The Leonardo Multi-Purpose Logistics Module will be making its third trip to the International Space Station during STS-111. Leonardo is one of three Multi-Purpose Logistics Modules, or MPLMs, built by the Italian Space Agency that serve as pressurized, reusable cargo carriers to ferry supplies, equipment and experiments between the ground and the space station.

During STS-111, Leonardo will contain about 2,540 kilograms (5,600 pounds) of cargo. It will also contain eight Resupply Stowage Racks, five Resupply Stowage Platforms, two International Stowage Racks and two new scientific experiment racks for the station. The new science rack, EXPRESS Rack 3, will increase the orbital outpost's science capabilities. The other scientific rack is the Microgravity Science Glovebox. Other cargo includes supplies and equipment for the station's new residents, the Expedition Five crew.

Leonardo will be lifted out of Space Shuttle Endeavour's cargo bay and installed onto the station's Unity Node on Flight Day 4. The MPLM, which will be filled with items returning to Earth, is scheduled to be returned to the payload bay on Flight Day 10.