Workers in the Space Station Processing Facility perform a fit check on a Power Data Grapple Fixture before installing.

Workers in the Space Station Processing Facility perform a fit check on a Power Data Grapple Fixture before installing it on hardware for mission STS-98. During the mission, the crew will install the U.S. Lab in the International Space Station during a series of three space walks. The STS-98 mission will provide the station with science research facilities and expand its power, life support and control capabilities