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Inside the Vehicle Assembly Building, Space Shuttle Atlantis stands ready for rollout to Launch Pad 39A. It sits on top of a Mobile Launcher Platform (MLP), a two-story steel structure 25 feet high, which supports and restrains the Shuttle during assembly, transit and while at the pad. The MLP weighs 8.23 million pounds. The entire configuration of Shuttle plus MLP is moved to the pad aboard a crawler-transporter. Liftoff of Atlantis on mission STS-101 is scheduled for April 17 at 7:03 p.m. EDT. STS-101 is a logistics and resupply mission for the International Space Station, to restore full redundancy to the International Space Station power system in preparation for the arrival of the next pressurized module, the Russian-built Zvezda.