July 24th, 2009. The spacewalkers Chris Cassidy and Tom Marshburn exit the Quest airlock to begin the 4th spacewalk of STS-127 mission. During the EVA, Chris and Tom will install 4 batteries on the P6 truss segment and will also install some camera equipment on the Kibo Exposed Facility. The spacewalk is scheduled to last for 7.5 hours.
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