Mastracchio is performing his ninth spacewalk in support of space station assembly and maintenance. He is wearing a spacesuit with red stripes. His helmet camera displays the number 20.
Swanson is conducting his fifth spacewalk. He is wearing a spacesuit with no stripes. His helmet camera displays the number 18.
During today's spacewalk, Mastracchio and Swanson will replaced a backup computer relay system located on the S0 truss that failed during testing April 11. The two spacewalkers will unhinge three bolts that secure the box to the truss, remove and temporarily stow it on a space station handrail and install the new one before packing up their tools and the failed unit and returning to the Quest airlock.
If time permits, Swanson also will cut a lanyard draped across a Secondary Power Distribution Assembly door.
This is the 179th spacewalk in support of space station assembly and maintenance and is designated U.S. Spacewalk #26.
Here, Mastracchio exits the Quest airlock.
On April 24, 1990, the Hubble Space Telescope was launched aboard Space Shuttle Discovery on the STS-31 mission. The mission featured the deployment of the Hubble Space Telescope, the first of NASA's Great Observatories to reach orbit. STS-31 was the tenth launch of the shuttle Discovery. On board were astronauts Charles F. Bolden (pilot, now NASA Administrator), Steven A. Hawley (mission specialist), Loren J. Shriver (commander), Bruce McCandless (mission specialist) and Kathryn D. Sullivan (mission specialist, now NOAA Administrator).
In this April 25, 1990 photograph taken with a handheld Hasselblad camera, most of the giant Hubble Space Telescope can be seen as it is suspended in space by Discovery's Remote Manipulator System (RMS) following the deployment of part of its solar panels and antennae. This was among the first photos NASA released on April 30 from the five-day STS-31 mission.
Image Credit: NASA
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NASA astronauts and Expedition 39 Flight Engineers Rick Mastracchio and Steve Swanson will venture outside the orbital complex to replace a failed backup computer relay system called a multiplexer-demultiplexer (MDM).
The backup MDM failed during routine testing April 11. The box is one of the station's external MDMs that provide commands to some of the space station's systems, including the external cooling system, solar alpha rotary joints and mobile transporter rail car.
Watch the spacewalk live on NASA Television or at: http://www.nasa.gov/ntv.
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