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*International Space Station Status Report #06-27*
*1 a.m. CDT, Friday, June 2, 2006*
*Expedition 13 Crew*

The residents of the International Space Station ventured outside their 
orbital home Thursday night to conduct a 6-hour, 31-minute spacewalk to 
repair, retrieve and replace hardware on the U.S. and Russian segments 
of the complex.

Clad in Russian Orlan spacesuits, Expedition 13 Commander Pavel 
Vinogradov and NASA Flight Engineer and Science Officer Jeff Williams 
opened the hatch to the Pirs Docking Compartment airlock at 5:48 p.m. 
CDT to begin the 65th spacewalk devoted to station assembly and 
maintenance. It was the sixth spacewalk for Vinogradov and the second 
for Williams. The spacewalk began as the station flew 220 miles over 
southern Asia.

After setting up tools and tethers outside Pirs, Vinogradov and Williams 
used the telescoping boom, designated Strela and attached to the 
airlock, to transport them to the forward area of the Zvezda Service 
Module that connects to the Zarya Module. There, Vinogradov installed a 
new nozzle to a valve that helps vent hydrogen into space from the 
Elektron oxygen-generator in Zvezda. Elektron uses the process of 
electrolysis to separate hydrogen and oxygen from water in the system. 
Oxygen is circulated into the cabin atmosphere while hydrogen is vented 
overboard. A nozzle on the hull of Zvezda used for that purpose 
previously had become clogged, reducing Elektronís efficiency and 
forcing Elektron to use the same vent line employed by a contamination 
monitoring device.

Two weeks ago, Vinogradov rigged a vent line inside Zvezda as the 
precursor to the installation of the new vent valve nozzle on the 
exterior of the module. The refurbished Elektron is scheduled to be 
reactivated on Monday.

Next, the two moved to the aft end of Zvezda where they took pictures of 
one of several antennas designed to provide navigational information for 
the unpiloted docking of the European Automated Transfer Vehicle (ATV), 
scheduled to make its maiden flight next year. Russian engineers suspect 
the antennaís cable may have prevented a cover on one of Zvezdaís 
reboost engines from opening during an aborted test firing earlier this 

Later, Vinogradov took up cable slack from another ATV navigation 
antenna and took pictures for technicians to study.

While on the Russian segment of the station, Vinogradov removed a device 
called Kromka from Zvezdaís hull that has collected jet thruster residue 
while Williams retrieved the third in a series of three canisters from 
the outside of Pirs in an experiment called Biorisk that studied the 
effect of the space environment on microorganisms. Both Kromka and 
Biorisk were brought inside and will be returned to Earth.

Williams also collected a contamination monitoring unit from Pirs and 
returned it to the cabin for later analysis.

With the crew slightly behind schedule, a decision was made to extend 
the maximum time for the spacewalk. Following that decision, control of 
the spacewalk was handed from the Russian flight control team at the 
Russian Mission Control Center outside Moscow to the U.S. flight control 
team at Mission Control Houston, as planned.

Vinogradov and Williams maneuvered themselves on the Strela to the 
juncture of the Russian and U.S. segments of the outpost, and then moved 
to the stationís truss. They removed a video camera on the Mobile Base 
System that sits upon a rail car that moves up and down the truss to 
position the stationís robotic arm for assembly work. They replaced the 
camera, which failed in February 2005, with a new one.

Russian flight controllers reassumed responsibility for the spacewalk as 
Vinogradov and Williams used Strela to move back to the Pirs Docking 
Compartment. They re-entered the station and closed the hatch at 12:19 
a.m. CDT to conclude their excursion.

The crew will reactivate station systems early this morning and open up 
the internal hatches between the U.S. and Russian segments before 
beginning a sleep period that will extend into Friday afternoon. 
Vinogradov and Williams will enjoy a few days of relaxation through 
early next week.

The next station status report will be issued on Friday, June 9, or 
earlier if events warrant. For more about the crew's activities and 
station sighting opportunities, visit:

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