The STS-100 crew gathers at the bus Terminal Countdown Demonstration Test activities are hampered by the rain.

The STS-100 crew gathers at the bus when Terminal Countdown Demonstration Test activities are hampered by the rain. Standing with the bus driver, from left, are Mission Specialist John L. Phillips, Commander Kent V. Rominger, Mission Specialists Umberto Guidoni, Chris Hadfield, [driver], and Scott E. Parazynski, Pilot Jeffrey S. Ashby and Mission Specialist Yuri V. Lonchakov. TCDT includes emergency escape training at the pad and a simulated launch countdown. The mission is carrying the Multi-Purpose Logistics Module Raffaello and the Canadian robotic arm, SSRMS, to the International Space Station. Raffaello carries six system racks and two storage racks for the U.S. Lab. The SSRMS is crucial to the continued assembly of the orbiting complex. Launch of mission STS-100 is scheduled for April 19 at 2:41 p.m. EDT from Launch Pad 39A