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STS-121 MCC Status Report #12



3 a.m. CDT, Monday, July 10, 2006
Mission Control Center, Houston, Texas


STS-121 MCC Status Report #12

Discovery Mission Specialists Mike Fossum and Piers Sellers will work on 
the International Space Station’s mobile transporter and install a pump 
module today on the second of three spacewalks of the STS-121 mission.

The shuttle crew was awakened at 1:08 a.m. CDT by "Clocks," performed by 
Coldplay. It was requested by Sellers' family for the day of the second 

The spacewalk is scheduled to begin at 7:13 a.m. and expected to last 
nearly seven hours. First, Fossum and Sellers will make their way to the 
shuttle’s payload bay to a spare pump module for the station’s thermal 
control system. Once there, they will attach it to the fixed grapple bar 
which will allow Mission Specialists Lisa Nowak and Stephanie Wilson, 
inside at the controls of the robotic arm, to maneuver the pump to the 
external stowage platform.

While the module is being moved, Fossum and Sellers will stay in the 
payload bay and get ready for their next task, replacement of a trailing 
umbilical system (TUS) reel assembly, this one on the nadir side of the 
mobile transporter.

After they reconfigure the payload bay for the activity, they’ll then 
translate to the starboard zero truss segment, to get it ready for 
retrieval. Fossum will disconnect electrical cables while Sellers 
changes out the assembly. Once it is ready, they will leave that site to 
go to the stowage platform and assist with the detaching and 
installation of the pump into its permanent storage location. That pump 
is onboard as a spare should it be needed in the future.

The two spacewalkers will then return to the truss and remove the TUS 
reel assembly. Fossum, on the end of the robotic arm, will take the reel 
assembly to the payload bay. Sellers will move there on his own, and set 
up for the swap of that assembly with a new one. After the swap is 
complete, the two will go back to the worksite to install the new reel 
assembly, reroute the power and data cable and thus restoring the 
desired redundancy to the mobile transporter and enabling it again to be 
used for continued station assembly tasks.

Shuttle Commander Steve Lindsey and Pilot Mark Kelly will support the 
spacewalk with Lindsey monitoring the vehicle systems and 
video/television set ups and Kelly overseeing activities and coaching 
the spacewalkers.

The Expedition 13 crew, Commander Pavel Vinogradov and flight engineers 
Jeff Williams and Thomas Reiter, will be working steadily throughout the 
day transferring trash and unneeded equipment and supplies for return to 
Earth in the multipurpose logistics module Leonardo. More than 4,300 
pounds of cargo will be packed for the return to Earth.

The next STS-121 mission status report will be issued Monday evening, or 
earlier if events warrant.

- end -
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