The third STS-131 spacewalk ended at 8:38 a.m. EDT, a six-hour, 24-minute outing for Mission Specialists Rick Mastracchio and Clayton Anderson.
The spacewalkers fell behind the timeline when an alignment issue delayed the stowage of the depleted Ammonia Tank Assembly on a carrier in space shuttle Discovery’s cargo bay. Some planned tasks had to be deferred. Before wrapping up, the spacewalkers relocated a portable foot restraint and prepared cables on the Zenith 1 truss for a spare Space to Ground Ku-Band antenna, two chores required before space shuttle Atlantis’ STS-132/ULF-4 mission in May.
This was the final STS-131 spacewalk, the 236th conducted by U.S. astronauts, and the sixth for both Mastracchio and Anderson. It was the 143rd in support of International Space Station assembly and maintenance, totaling 893 hours, 33 minutes. It was the 115th spacewalk based out of the space station, totaling 706 hours, 18 minutes.
Mastracchio’s six spacewalks total 38 hours, 30 minutes and Anderson’s six spacewalks total 38 hours, 28 minutes. The pair now ranks 21st and 22nd on the list of cumulative spacewalk time.