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Astronauts Complete Second Spacewalk



SUBMITTED BY ARTHUR N1ORC - AMSAT A/C #31468

The second of three spacewalks scheduled for STS-121 is now in the 
books. Mission Specialists Piers Sellers and Mike Fossum completed both 
major objectives of the 6-hour, 47-minute excursion, which concluded at 
3:01 p.m. EDT.

The first task the orbital duo completed was the installation of a spare 
thermal control system pump on to the outside of the Quest Airlock.

Then, Sellers and Fossum turned their attention to maintenance on the 
mobile transporter. They replaced a reel assembly for a cable that 
provides power and data to the stationís mobile transporter. The 
completion of this job gives the transporter fully functional primary 
and backup systems for use during future station assembly tasks.

Pilot Mark Kelly coordinated the spacewalk activities from inside 
Discovery, and Commander Steve Lindsey monitored vehicle systems and 
video setups. Mission Specialists Stephanie Wilson and Lisa Nowak were 
the robotic arm operators.

While the shuttle crew focused on the spacewalk, the Expedition 13 crew 
concentrated on loading the Leonardo multi-purpose logistics module with 
scientific experiment results, unneeded items and trash from the 
station. Leonardo will return to Discoveryís payload bay Friday in 
preparation for the return to Earth.

The final scheduled spacewalk, which will feature on-orbit shuttle heat 
shield repair techniques, is slated to begin at 8:13 a.m. EDT Wednesday.

+ NASA TV | + STS-121 Shuttle Mission TV Schedule
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