The external stowage platform is the third to be installed on the to hold spacewalk tools and spare equipment. The first two were attached during spacewalks conducted during previous shuttle missions.
Astronauts Tracy Caldwell and Barbara Morgan used Endeavour’s robot arm to lift the platform from the shuttle's payload bay and hand it to the station arm operated by STS-118 Pilot Charles Hobaugh and astronaut Clay Anderson, who then attached the platform to the station's Port 3 truss segment.
National Aeronautics and Space Administration controllers in Houston said the crew began the day at 6:07 a.m. Tuesday with a "wakeup call" wishing Caldwell a happy birthday.
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