STS109-E-5221 (4 March 2002) --- Astronaut John M. Grunsfeld, payload commander, signals readiness for the first the first of his assigned STS-109 space walks to perform work
on the Hubble Space Telescope (HST). Astronauts Grunsfeld and Richard M. Linnehan later donned their helmets and the remainder pieces of their extravehicular mobility unit (EMU) space suits and egressed the Space Shuttle Columbia, eventually replacing
the giant telescope�s starboard solar
array during a space walk that ended at 7:38 a.m. (CST) or 13:38 GMT March 4, 2002.
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