Crew arrives at Cape Monday.
Forecasters offered a near ideal weather outlook. The Canadian robotic device is considered essential to the space station's expansion. In June, the new robot arm will be used to install the U.S. airlock module that another shuttle crew is to deliver. Endeavour's crew also plans to deliver nearly 4 tons of research gear, food, clothing, spare parts and other supplies. All of the equipment is stowed in the Italian-made Rafaello cargo module that will be attached to the station with Endeavour's smaller robot arm.