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The Space Shuttle Discovery has made its final 5.4km (3.4-mile) crawl to the Kennedy Space Center’s Launch Pad and is now being made-ready for its final flight, which is currently scheduled to begin on 24 February.
During Discovery’s final spaceflight, the crew members will take important spare parts to the International Space Station along with the Express Logistics Carrier-4.
ExPRESS Logistics Carrier (ELC) is an unpressurized attached payload platform for the International Space Station (ISS) that provides mechanical mounting surfaces, electrical power, and command and data handling services for science experiments on the ISS. (“ExPRESS” stands for Expedite the Processing of Experiments to the Space Station).
ELC-1 is located on the P3 truss.
ELC-2 is located on the S3 truss.
ELC were formerly called “Express Pallet” and is the unpressurized counterpart to the pressurized ExPRESS Rack. An ELC provides scientists with a platform and infrastructure to deploy experiments in the vacuum of space without requiring a separate dedicated Earth-orbiting satellite. ELCs interface directly with the ISS integrated truss Common Attach System (CAS).