Astronaut Daniel Tani, Expedition 16 flight engineer, participates in the second of five scheduled sessions of extravehicular activity as construction continues on the International Space Station. During the 6 hour, 33 minute spacewalk, Tani and astronaut Scott Parazynski, STS-120 mission specialist, worked in tandem to disconnect cables from the P6 truss, allowing it to be removed from the Z1 truss. Tani also visually inspected the station's starboard Solar Alpha Rotary Joint and gathered samples of "shavings" he found under the joint's multilayer insulation covers. The spacewalkers also outfitted the Harmony module, mated the power and data grapple fixture, and reconfigured connectors on the S1 truss that will allow the radiator on S1 to be deployed from the ground later.
