The STS-125 mission's first spacewalk concluded at 4:12 p.m. EDT. During the 7 hour, 20-minute excursion, Grunsfeld and Feustel removed the Wide Field Planetary Camera 2, or WFPC 2, and installed the Wide Field Camera III, or WFC III. They also swapped out the Science Instrument Command and Data Handling Unit, installed a soft capture mechanism, lubricated three of the shroud doors, and one of the three latch-over center kits. They had some difficulty with the other two, installing a latch repair on one of the bolts, and partially installed a second Lock. That door is now secure for when it's revisited on the mission's third spacewalk.

Today's mission status briefing, originally scheduled for 3:30 p.m., will now begin at 5 p.m. The participants will be Tony Ceccacci, STS-125 lead flight director, Tomas Gonzalez-Torres, STS-125 lead EVA officer, Jon Morse, director, Astrophysics Division, NASA Headquarters, Preston Burch, HST Program manager, and Dave Leckrone, HST Senior Scientist, Goddard Spaceflight Center, Md.

source: nosa.gov