Mission Control Center, Houston, Texas
HOUSTON ' The second of a record five spacewalks on one space shuttle visit to the International Space Station begins this morning, and it will end with a major station element en route to a new location.
Today's wakeup song at 12:09 a.m. CDT, 'What a Wonderful World,' by Louis Armstrong, was played for Mission Specialist Scott Parazynski on the day he makes his second spacewalk of the mission. He and Flight Engineer Dan Tani spent the night camped out in the Quest airlock to purge nitrogen from their bloodstreams to help prevent them from experiencing decompression sickness.
While the spacewalkers suit up, mission specialists Stephanie Wilson and Doug Wheelock will maneuver the station's robot arm to grapple the P6 truss element, now secured atop the Z1 truss. When Parazynski and Tani exit the station at 4:58 a.m. CDT they will head for the intersection of the P6 and Z1 to disconnect the last umbilicals and bolts holding the two components together.
When they finish there the spacewalkers will move to separate jobs. Parazynski will go to the new Harmony node, installed on the Unity node Friday, to install handholds and other equipment. Tani will move to the starboard truss for two inspections. He will look for sharp edges on handrails on the Crew and Equipment Translation Aid cart and then move to the Solar Alpha Rotary Joint to look for the cause of increased friction that has been observed recently when that joint is rotated.
At the same time, Wilson and Wheelock will use Candaram2 to lift P6 off of the Z1 truss, the first step in its move to the far port end of the station's truss structure. The 45-foot-long truss will remain on the arm tonight and will be handed over to the shuttle robot arm Monday. This allows the station arm atop its mobile operating base to move along the truss railway closer to the P6 outboard installation point and then P6 will be handed back to Canadarm2 for installation Tuesday during the mission's third spacewalk.
Late in today's spacewalk Parazynski and Tani meet up again to install a new grapple fixture on Harmony, a fixture that the station arm will use next month to remove Harmony from Unity and install it at the front of the Destiny laboratory. At that location Harmony will provide docking ports for the European and Japanese laboratory modules scheduled to arrive later this year and early next year.
Today's spacewalk, the fifth of Parazynski's career and the second for Tani, is scheduled to end at 11:38 a.m. CDT.
The next STS-120 status report will be issued Sunday afternoon or earlier if events warrant.
