March 2, 2011
Second Spacewalk Begins Outside International Space Station
Astronauts Steve Bowen and Alvin Drew started the second spacewalk of the STS-133 mission on Wednesday morning.
This is the 244th spacewalk performed by U.S. astronauts and the 155th in support of the International Space Station (ISS).
Drew will complete the last task related to the failed ammonia pump module the two moved into a storage location on Monday.
He will vent the remaining ammonia from the module into space by using a special tool to protect his spacesuit from any ammonia contamination.
Bowen will ride the station's robotic arm to the Columbus module and retrieve a lightweight adapter plate assembly that was used to attach experiments to the outside of Columbus.
Drew will also remove insulation from the avionics assembly on the Express Logistics-Carrier and gather up three sets of stowage bags from the Crew Equipment Translation Aid (CETA) car on the left side of the station's truss.
This is Discovery's final mission, as it becomes the first of three space shuttles to be retired by NASA this year.
Image Caption: Mission Specialist Alvin Drew works outside the International Space Station during the second STS-133 spacewalk. Image credit: NASA TV
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