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While anchored to the foot restraint on the Canadarm2, an astronaut removes a faulty control moment gyroscope (CMG-3) and installs a new CMG into the station's Z1 truss. The failed CMG will remain at its temporary stowage location on the station's exterior until it is returned to Earth on a later shuttle mission. The new gyroscope is one of four CMGs that are used to control the station's altitude in orbit.
December 13th, 2011
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