EVA to repair the SMM

41C-37-1718 (11 April 1984) --- Astronaut James D. van Hoften and a repaired satellite are captured by a Hasselblad camera aimed through Challenger's aft cabin windows toward the cargo bay of the Earth orbiting Challenger. Dr. van Hoften is getting in his first "field" test of the manned maneuvering unit (MMU) after months of training in an underwater facility and in a simulator on Earth. The Solar Maximum Mission Satellite (SMMS), revived and almost ready for release into space once more, is docked at the flight support system (FSS).