EVA
On Thursday, 16 September 1993, spacewalkers Jim Newman and Carl Walz performed an EVA designed to evaluate tools, tethers and a foot restraint platform. Their findings reassured the designers and planners of the Hubble Space Telescope servicing flight that their preparations were sound. This was the third and final shuttle mission to include a preparatory EVA in response to the weaknessness in EVA training exposed by the STS-49 mission. The new equipment tested during the extensive spacewalk would later be required for the December 1993 Hubble Space Telescope servicing mission, and was only part of the objectives of the spacewalk, with Newman and Walz fulfilling the other goals as they explained at length to Mission Control the differences they perceived between work in orbit and ground training. The two EVA crewmen were ahead of schedule much of the day, and completed more tasks than originally planned. As the two astronauts were cleaning up, a balky tool box lid slowed them down when they had to pry it free and close it for Discovery'’s trip home. The toolbox lid stretched the spacewalk by about 45 minutes over what had been planned, with Newman and Walz logging a total seven hours, five minutes and 28 seconds of time outside of the vehicle. This was the 112th EVA performed in the history of human spaceflight.
Read more about this topic: STS-51
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