SPARTAN-204 was also used for extravehicular activity (EVA) near end of the flight. Foale and Harris began their EVA suspended at the end of the robot arm, away from the payload bay, to test modifications to their spacesuits to keep spacewalkers warmer in the extreme cold of space. The two astronauts were then scheduled to practice handling the approximately 2,500 pound () SPARTAN to rehearse space station assembly techniques, but both astronauts reported they were becoming very cold—this portion of the spacewalk being performed during a night pass—and mass handling was curtailed. This 29th Shuttle spacewalk, the first for both a UK-born astronaut and an African-American astronaut, lasted 4 hours, 38 minutes.