|Volume: 04, Issue: 20||05/31/2006|
Repairs & Experiments Focus of June 1 SpacewalkRepair of a vent for the International Space Stationís oxygen-producing Elektron unit, retrieval of experiment results, and replacement of a camera on the orbiting laboratoryís rail car system are among the activities scheduled for a 5-hour, 41-minute spacewalk June 1.
Station commander Pavel Vinogradov and NASA Science Officer Jeff Williams are scheduled to leave the airlock of the Pirs Docking Compartment about 6:40 pm EDT. They will wear Russian Orian spacesuits.
Vinogradov is designated lead spacewalker, or EV1,wearing a red-striped suit. He and Williams, EV2, wearing a suit with blue stripes, will move out of the airlock and to the Strela hand-operated crane. The crewmembers will use it to move about the stationís Russian segment.
The Elektron vent repair is the first task. Because of a problem with that vent, Vinogradov had to reroute Elektronís hydrogen vent line to a vent also used by the Vozdukh carbon dioxide removal system. This repair will enable them to re-establish the original vent line.
The Elektron breaks down water into its components, hydrogen and oxygen. The oxygen is used in the station and the hydrogen is vented overboard. The repair, involving installation of a nozzle on the neck of a valve, should take about 35 minutes, followed by 10 minutes to photograph the area.
Next Vinogradov will remove a plate from the Kromka experiment. Kromka looks at contamination from thruster jet firings and devices to protect the stationís exterior from them. While he is doing that, Williams will remove a Biorisk experiment container from Pirs for return to the inside of the station. Biorisk studies the effect of spaceflight on microorganisms.
Vinogradov then will remove slack in a cable of an antenna on the Zvezda Service Module designed for docking of the unpiloted European Automated Transfer Vehicle, scheduled for its first launch next year. Meanwhile, Williams will retrieve a contamination monitoring device from Zvezda.
The spacewalkís final and longest major task is the replacement of a malfunctioning camera on the Mobile Base System, which moves the Canadarm2 robotic arm along the rails on the stationís main truss. Both spacewalkers will work on that job, scheduled to take an hour and 25 minutes.
Vinogradov and Williams will secure the Strela before re-entering Pirs to conclude the spacewalk. It is the sixth spacewalk for Vinogradov and the second for Williams.
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