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July 18, 2011
Astronauts John M. Grunsfeld, STS-109 payload commander, works in tandem with astronaut Richard M. Linnehan, mission specialist, as the two devote their attention to the replacing one of the Hubble Space Telescopes (HST) two second-generation solar arrays, which is also know as SA2, and a Diode Box Assembly. The solar array was replaced with a new, third-generation solar array, which is called SA3. Linnehan stands on a foot restraint on the end of the Space Shuttle Columbia's Remote Manipulator System (RMS). The space walkers also did some prep work for STS-109s other sessions of extravehicular activity (EVA).

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