Crew --

• Extravehicular (EV 1) crew member Jeff Williams
• EV 2 crew member -- Jim Voss
• Remote Manipulator System (RMS) operator Mary Ellen Weber
• Intravehicular Activity (IVA) crew member / backup spacewalker Scott Horowitz

Williams and Voss are scheduled for a six-and-a-half-hour spacewalk on flight day four of the mission. Inside Atlantis, Weber will operate the shuttles Remote Manipulator System (RMS) or robot arm, while Horowitz as the IVA crew member assists the spacewalkers with checklists and keeping them on schedule.

STS 101 Mission Specialist James S. Voss, in the training for

extravehicular activity.

Major tasks --

• Inspect and repair U.S. crane
• Install Russian-built crane
• Install new radio antenna

"Get-ahead" tasks (not mission-critical) --

• Install handrails to Unity module and attach video cable

Timeline (hours:minutes) --

• 00:00-00:15 Exit airlock and prepare tools
• 00:15-00:45 Inspect and repair U.S.-built crane
• 00:45-01:30 Gather and assemble parts; prepare to install Russian-built crane
• 01:30-01:45 Install Russian-built crane
• 01:45-03:45 Install radio antenna
• 03:45-04:45 Install handrails and attach video cable
• 04:45-06:30 Stow tools and parts; return inside airlock