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ISS SCIENCE REPORT #SS06-023



SUBMITTED BY ARTHUR N1ORC - AMST A/C #31468

May 12, 2006

Katherine Trinidad
Headquarters, Washington
(202) 358-3749

James Hartsfield
Johnson Space Center, Houston
(281) 483-5111

STATUS REPORT: SS06-023

INTERNATIONAL SPACE STATION STATUS REPORT: SS06-023

Expedition 13 Commander Pavel Vinogradov and Flight Engineer Jeff 
Williams focused this week on science experiments, maintenance tasks 
and unpacking cargo on the International Space Station.

Using the microgravity science glovebox, Williams began the second of 
three sessions Wednesday of the Pore Formation and Mobility 
Investigation experiment. This experiment studies bubbling that 
occurs in weightlessness as liquids cool and solidify.

Williams will begin his first Saturday Science activity this weekend 
with the Cellular Biotechnology Operations Support Systems Fluid 
Dynamics Investigation. This is a series of experiments to improve 
fluid mixing techniques and to control bubble distribution for cell 
culture in orbit.

On May 4, ISS Progress 21 engines were used to reboost the station. 
Afterward, an error message indicated the Zvezda Service Module 
computers couldn't command the Progress engines to reconfigure for 
normal operations. The reboost was not affected. Engineers have 
determined the most likely cause of the message was a software error, 
which will be corrected. Meanwhile, a procedural change will allow 
the Progress thrusters to be used. Vinogradov and Williams continued 
to unpack supplies from that cargo vehicle.

Last week, engineers detected a small reduction of nitrogen pressure 
in the liquids unit of the oxygen-generating Elektron. To isolate the 
source of the leak, Russian flight controllers asked Vinogradov to 
turn off the machine. They have identified the small leak and plan to 
operate the Elektron as needed. A spare liquids unit is onboard.

The Elektron will remain deactivated until after a June 1 spacewalk. 
Engineers originally had planned to turn it off next week to 
reconfigure ventilation lines and to install a new hydrogen vent 
before the extravehicular activity. Meanwhile, oxygen from tanks in 
the ISS Progress 20 cargo vehicle is being added to the station's 
cabin.

On Thursday, Williams practiced using the station's robotic arm. He 
and Vinogradov spoke Wednesday with reporters from the StarDate 
syndicated Radio Network and WISN-TV of Milwaukee.

The next station status report will be issued on Friday, May 19, or 
earlier if events warrant. For more about the crew's activities and 
station sighting opportunities, visit:

http://www.nasa.gov/station

	
-end-



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