Astronauts Prepare for Third Spacewalk

HOUSTON, April 12 (UPI) — Space shuttle Discovery astronauts Rick Mastracchio and Clayton Anderson were preparing for the third and final scheduled spacewalk of their STS-131 mission.

After a review of spacewalk procedures with other crew members, they will spend Monday night in the International Space Station’s Quest airlock with its pressure reduced to prevent decompression sickness during the spacewalk.

That spacewalk is to begin at 3:11 a.m. EDT Tuesday and last 6 1/2 hours. Activities include finishing the complicated removal and replacement of a large ammonia tank assembly, retrieving micrometeoroid shields from outside the airlock and retrieving a lightweight adapter plate assembly.

The other astronauts from Discovery joined the ISS crew in moving equipment and supplies from the shuttle and the Leonardo Multi-Purpose Logistics Module into the space station.

Discovery and its crew are to return to Earth April 19.

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