During his first stay aboard the station, Noguchi performed three spacewalks, all three alongside Robinson. On the first excursion outside, the two tested new techniques for repairing damaged tiles on the shuttle's heat shield, while the second and third spacewalks were both dedicated to upgrading and maintaining the space station, replacing a Control Movement Gyro which had suffered a mechanical failure in 2002 and installing an External stowage platform which was brought up aboard STS-114. Over the course of the three EVAs Noguchi spent 20 hours and 5 minutes outside the station.