A worker moves the Payload Ground Handling Mechanism away from the open doors of Space Shuttle Endeavour's payload bay.

A worker in the Payload Changeout Room, Launch Pad 39A, moves the Payload Ground Handling Mechanism away from the open doors of Space Shuttle Endeavour’s payload bay. The PGHM helped move the STS-100 mission payload into the bay. Visible above and behind the worker is the Multi-Purpose Logistics Module Raffaello, which carries six system racks and two storage racks for the U.S. Lab. Above Raffaello is the Canadian robotic arm, the SSRMS. Capable of handling large payloads and assisting with docking the Space Shuttle, the SSRMS is crucial to the continued assembly of the International Space Station. Launch of mission STS-100 is scheduled for April 19 at 2:41 p.m. EDT