The port three and four (P3/P4) integrated truss segment is the prime payload of the STS-115 mission, scheduled to lift off from Launch Pad 39B at Kennedy Space Center, Fla., in late August or early September.
"The truss in its launch configuration is about 45 feet long, but once on orbit with the solar arrays deployed, it will have a wingspan of almost 240 feet," says Robbie Ashley, space station mission manager for the STS-115 mission