Astronauts Peggy Whitson and Carl Walz, manipulating the International Space Station's Canadarm 2 robotic arm, have successfully installed the Canadian Space Agency's operations platform - the Mobile Remote Servicer Base System (MBS) - to the station's Mobile Transporter 'rail car.' The robotic arm has been providing 'stay alive' power to the MBS since Sunday evening.

Whitson and Walz slowly and deliberately lowered the MBS until it reached a position where it could be grasped by a claw-like latch on the Mobile Transporter. The MBS will serve as an interface between the Canadarm2 and the Mobile Transporter, providing power, data and video capabilities after the Canadarm2 is eventually repositioned and mounted on the Mobile Transporter.

On Wednesday, spacewalkers Franklin Chang-Diaz and Phillippe Perrin will permanently bolt the MBS to the Mobile Transporter, which is attached to rails on the station's S0 Truss. The pair will then attach power and data cables to the MBS enabling it to operate its heaters by drawing power from the station complex, allowing the Canadarm2 to be disconnected.

A false smoke alarm, probably triggered by dust, forced a postponement in the formal ISS Change of Command ceremony between the Expedition 4 and 5 crews.

The astronauts and cosmonauts were posed in front of the television camera in the station's Destiny module for the start of the ceremony when a fire alarm rang out from the Zarya module. The crews scrambled to investigate and quickly determined that it was a false alarm. The ceremony will be videotaped for downlink at a later time.

Earlier today, astronauts Peggy Whitson and Carl Walz, manipulating the International Space Station's Canadarm2 robotic arm, successfully installed the Canadian Space Agency's operations platform - the Mobile Remote Servicer Base System (MBS) - on the station's Mobile Transporter 'rail car.' The robotic arm has been providing 'stay alive' power to the MBS since Sunday evening.

Whitson and Walz slowly and deliberately lowered the MBS until it reached a position where it could be grasped by a claw-like latch on the Mobile Transporter. The MBS will serve as an interface between the Canadarm2 and the Mobile Transporter, providing power, data and video capabilities after the Canadarm2 is eventually repositioned and mounted on the Mobile Transporter.

On Tuesday, spacewalkers Franklin Chang-Diaz and Phillippe Perrin will permanently bolt the MBS to the Mobile Transporter, which is attached to rails on the station's S0 Truss. The pair will then attach power and data cables to the MBS enabling it to operate its heaters by drawing power from the station complex, allowing the Canadarm2 to be disconnected.

Monday's flight agenda also calls for the ten astronauts and cosmonauts to finish offloading the 5,600 pounds of supplies and equipment from the Leonardo Multi-Purpose Logistics Module. Leonardo will then be refilled with equipment and trash from the station to be carried back to Earth in Endeavour's cargo bay.

Expedition 5 cosmonaut Valeri Korzun has formally assumed command of the International Space Station. Outgoing Expedition 4 commander Yuri Onufrienko turned over the helm of the orbiting outpost to Korzun in a videotaped ceremony after an errant smoke alarm disrupted the live television broadcast on Monday afternoon.

The false alarm forced the ten astronauts and cosmonauts, posing for the television broadcast of the ceremony in the station's Destiny module, to scramble to investigate the alleged source in the Russian Zarya module. They quickly determined that it was a false alarm, probably caused by some dust kicked up by the transfer of supplies and equipment from the Leonardo Multi-Purpose Logistics Module. As of Monday morning, the crew had unloaded almost 75 percent of Leonardo's 5,600 pounds of cargo.

The smoke alarm disrupted an otherwise productive Monday. Astronauts Peggy Whitson and Carl Walz, manipulating the International Space Station's Canadarm2 robotic arm, successfully installed the Canadian Space Agency's operations platform - the Mobile Remote Servicer Base System (MBS) - on the station's Mobile Transporter 'rail car.' The robotic arm has been providing 'stay alive' power to the MBS since Sunday evening.

Whitson and Walz slowly and deliberately lowered the MBS until it reached a position where it could be grasped by a claw-like latch on the Mobile Transporter. The MBS will serve as an interface between the Canadarm2 and the Mobile Transporter, providing power, data and video capabilities after the Canadarm2 is eventually repositioned and mounted on the Mobile Transporter.

On Tuesday, Franklin Chang-Diaz and Phillippe Perrin will permanently bolt the MBS to the Mobile Transporter during the mission's second spacewalk. The pair will then attach power and data cables to the MBS enabling it to operate its heaters by drawing power from the station complex, allowing the Canadarm2 to be disconnected.

Spacewalkers Franklin Chang-Diaz and Phillippe Perrin are preparing to make their second excursion outside the International Space Station to complete the installation of the Canadian-built Mobile Remote Servicer Base System (MBS). The 6 1/2 hour spacewalk, or EVA, is scheduled to begin just after 11 a.m. EDT.

Chang-Diaz and Perrin will first attach power and data cables to the MBS, allowing the station's Canadarm2 robotic arm to disengage - the Canadarm2 has been providing 'stay alive' power to the MBS since Sunday when it was extracted from shuttle Endeavour's cargo bay. On Monday, the Canadarm2 slowly lowered the MBS until it was grasped by a claw-like latch on the Mobile Transporter.

The pair will then rotate the MBS' payload accomodations fixture - a grapple device to hold cargo on the MBS - and secure four bolts to permanently secure the MBS to the Mobile Transporter or 'railcar.' The MBS will serve as an interface between the Canadarm2 and the Mobile Transporter, providing power, data and video capabilities after the Canadarm2 is eventually repositioned and mounted on the Mobile Transporter.

The spacewalk's final task will be the relocation of a television camera on the MBS and to attach a bag to the MBS containing an emergency extension cable.

The other eight astronauts and cosmonauts will spend the day finishing the unloading the 5,600 pounds of supplies and equipment from the Leonardo Multi-Purpose Logistics Module. Leonardo will then be refilled with equipment and trash from the station to be carried back to Earth in Endeavour's cargo bay.

Endeavour astronauts Franklin Chang-Diaz and Phillippe Perrin have just switched to internal battery power on their spacesuits, officially marking the start of the mission's second spacewalk, or EVA. The switch to battery power occurred at 11:20 a.m. EDT.

Chang-Diaz, wearing the spacesuit with the red stripes, and Perrin are about to open the hatch from the International Space Station's Quest airlock to begin their planned 6 1/2 hour excursion outside the orbiting outpost.

The spacewalkers will first attach power and data cables to the MBS, allowing the station's Canadarm2 robotic arm to disengage - the Canadarm2 has been providing 'stay alive' power to the MBS since Sunday when it was extracted from shuttle Endeavour's cargo bay. On Monday, the Canadarm2 slowly lowered the MBS until it was grasped by a claw-like latch on the Mobile Transporter.

The pair will then rotate the MBS' payload accomodations fixture - a grapple device to hold cargo on the MBS - and secure four bolts to permanently secure the MBS to the Mobile Transporter or 'railcar.' The MBS will serve as an interface between the Canadarm2 and the Mobile Transporter, providing power, data and video capabilities after the Canadarm2 is eventually repositioned and mounted on the Mobile Transporter.

The EVA's final task will be the relocation of a television camera on the MBS and to attach a bag to the MBS containing an emergency extension cable.

The other eight astronauts and cosmonauts will spend the day finishing the unloading of 5,600 pounds of supplies and equipment from the Leonardo Multi-Purpose Logistics Module. Leonardo will then be refilled with equipment and trash from the station to be carried back to Earth in Endeavour's cargo bay.

Spacewalkers Franklin Chang-Diaz and Phillippe Perrin have completed about one-third of their planned 6 1/2 hour excursion outside of the International Space Station. The spacewalk, or EVA, officially started at 11:20 a.m. EDT when the astronauts switched to internal battery power in their spacesuits.

Chang-Diaz, wearing the spacesuit with the red stripes, and Perrin have completed connecting cables for power, video and data between the Canadian-built Mobile Remote Servicer Base System (MBS) and the station's Mobile Transporter or 'railcar.' Ground controllers will now send commands for the Mobile Transporter to remotely plug in its umbilical attachments to receptacles on the truss railway and begin a checkout of the MBS systems.

The pair are now rotating the MBS' payload accomodations fixture - a grapple device to hold cargo on the MBS - and will secure four bolts to permanently secure the MBS to the Mobile Transporter. The MBS will serve as an interface between the Canadarm2 and the Mobile Transporter, providing power, data and video capabilities after the Canadarm2 is eventually repositioned and mounted on the Mobile Transporter.

The EVA's final task will be the relocation of a television camera on the MBS and to attach a bag to the MBS containing an emergency extension cable.

The other eight astronauts and cosmonauts will spend the day finishing the unloading of 5,600 pounds of supplies and equipment from the Leonardo Multi-Purpose Logistics Module. Leonardo will then be refilled with equipment and trash from the station to be carried back to Earth in Endeavour's cargo bay.

Working at breakneck speed, astronauts Franklin Chang-Diaz and Phillippe Perrin have completed the mission's second spacewalk in record time. Today's excursion outside of the International Space Station lasted only 5 hours - about 90 minutes shorter than the planned 6 1/2 hours. The spacewalk, or EVA, officially started at 11:20 a.m. EDT and was completed at 4:20 p.m. EDT.

Chang-Diaz and Perrin successfully connected cables for power, video and data between the Canadian-built Mobile Remote Servicer Base System (MBS) and the station's Mobile Transporter or 'railcar.' Ground controllers then sent commands for the Mobile Transporter to remotely plug in its umbilical attachments to receptacles on the truss railway and checked out of the MBS systems.

The spacewalking pair also rotated the MBS' payload accomodations fixture - a grapple device to hold cargo on the MBS - and secured four bolts to permanently secure the MBS to the Mobile Transporter. The MBS will serve as an interface between the Canadarm2 and the Mobile Transporter, providing power, data and video capabilities after the Canadarm2 is eventually repositioned and mounted on the Mobile Transporter.

The EVA's final task was the relocation of a television camera on the MBS and the attachment of a bag to the MBS containing an emergency extension cable.

The other eight astronauts and cosmonauts spent the day unloading the remainder of the 5,600 pounds of supplies and equipment from the Leonardo Multi-Purpose Logistics Module. Leonardo will then be refilled with equipment and trash from the station to be carried back to Earth in Endeavour's cargo bay.

Astronauts and former Expedition 4 flight engineers Carl Walz and Dan Bursch have set a new U.S. space endurance record at 10:19 p.m. EDT tonight, exceeding Shannon Lucid’s record of 188 consecutive days spent in space, while Walz set a second U.S. record for 223 cumulative days spent in space accrued over the course of his five spaceflights.

Earlier on Tuesday, astronauts Franklin Chang-Diaz and Phillippe Perrin completed the mission's second spacewalk at breakneck speed. The excursion outside of the International Space Station lasted only 5 hours - about 90 minutes shorter than the planned 6 1/2 hours. The spacewalk, or EVA, officially started at 11:20 a.m. EDT and was completed at 4:20 p.m. EDT.

Chang-Diaz and Perrin successfully connected cables for power, video and data between the Canadian-built Mobile Remote Servicer Base System (MBS) and the station's Mobile Transporter or 'railcar.' Ground controllers then sent commands for the Mobile Transporter to remotely plug in its umbilical attachments to receptacles on the truss railway and checked out of the MBS systems.

The spacewalking pair also rotated the MBS' payload accomodations fixture - a grapple device to hold cargo on the MBS - and secured four bolts to permanently secure the MBS to the Mobile Transporter. The MBS will serve as an interface between the Canadarm2 and the Mobile Transporter, providing power, data and video capabilities after the Canadarm2 is eventually repositioned and mounted on the Mobile Transporter.

The EVA's final task was the relocation of a television camera on the MBS and the attachment of a bag to the MBS containing an emergency extension cable.

While Chang-Diaz and Perrin were spacewalking, their crewmates transferred unneeded equipment and trash into the Leonardo Multi-Purpose Logistics Module to be returned to Earth with Endeavour.

A joint press conference with the crews of shuttle Endeavour and ISS Expedition 5 tops the agenda for Wednesday. Reporters from the U.S., Canada and France will have the opportunity this afternoon to question the ten astronauts and cosmonauts on their progress of the mission.

Orbiting at an altitude of 240 miles, the Endeavour astronauts were awakened this morning at 5:30 a.m. EDT to the sounds of "Chasing Sheep is Best Left to Shepherds,” by Peter Greenaway, selected for French astronaut and spacewalker Phillippe Perrin by his family.

On Tuesday evening, former Expedition 4 flight engineers Carl Walz and Dan Bursch set a new U.S. space endurance record, exceeding Shannon Lucid’s record of 188 consecutive days spent in space, while Walz also set a second U.S. record for 223 cumulative days spent in space accrued over the course of his five spaceflights.

Astronauts Franklin Chang-Diaz and Phillippe Perrin will spend part of the day preparing for Thursday's spacewalk during which they will replace a faulty wrist roll joint on the space station’s robotic arm, the Canadarm2. On Tuesday, the pair completed the installation of the Canadian-built Mobile Remote Servicer Base System (MBS) during a 5-hour spacewalk.

The astronauts and cosmonauts will continue the transfer of unneeded equipment and trash into the Leonardo Multi-Purpose Logistics Module to be returned to Earth with Endeavour.

A joint press conference with the crews of shuttle Endeavour and ISS Expedition 5 tops the agenda for Wednesday. Reporters from the U.S., Canada and France will have the opportunity this afternoon to question the ten astronauts and cosmonauts on their progress of the mission.

Orbiting at an altitude of 240 miles, the Endeavour astronauts were awakened this morning at 5:30 a.m. EDT to the sounds of "Chasing Sheep is Best Left to Shepherds,” by Peter Greenaway, selected for French astronaut and spacewalker Phillippe Perrin by his family.

On Tuesday evening, former Expedition 4 flight engineers Carl Walz and Dan Bursch set a new U.S. space endurance record, exceeding Shannon Lucid’s record of 188 consecutive days spent in space, while Walz also set a second U.S. record for 223 cumulative days spent in space accrued over the course of his five spaceflights.

Astronauts Franklin Chang-Diaz and Phillippe Perrin will spend part of the day preparing for Thursday's spacewalk during which they will replace a faulty wrist roll joint on the space station’s robotic arm, the Canadarm2. On Tuesday, the pair completed the installation of the Canadian-built Mobile Remote Servicer Base System (MBS) during a 5-hour spacewalk.

The astronauts and cosmonauts will continue the transfer of unneeded equipment and trash into the Leonardo Multi-Purpose Logistics Module to be returned to Earth with Endeavour.

The crews of Endeavour and the International Space Station spent Wednesday loading unneeded equipment and trash into the Leonardo Multi-Purpose Logistics Module, stowing about 4,500 out of the expected 4,665 pounds of cargo to be returned to Earth in the shuttle's cargo bay.

Astronauts Franklin Chang-Diaz and Phillippe Perrin spent part of the day reviewing plans for Thursday's third and final spacewalk of the mission. The pair are scheduled to spend about 7 hours working outside the station replacing a faulty wrist-roll joint on the Canadarm2 robotic arm.

The ten astronauts and cosmonaut also took time to answer questions from reporters in Canada, France and the U.S. in a televised joint press conference.

Endeavour commander Ken Cockrell and pilot Paul Lockhart fired the orbiter's small maneuvering engines to raise the space station's orbit by about one mile.

Astronauts Philippe Perrin and Franklin Chang-Diaz are preparing for the mission's final spacewalk, a planned 7 hour excursion to replace the wrist-roll joint on the International Space Station’s Canadarm2 robotic arm. The spacewalk, or EVA, is scheduled to begin at about 10:43 a.m. EDT.

The spacewalkers will first remove the Canadarm2's 'hand', the latching end effector (LEE), exposing the faulty wrist roll joint. They will then disconnect the wrist roll joint and carry it to Endeavour’s payload bay. Chang-Diaz will remove the new wrist-roll joint from its carrier, Perrin will bring it up to Canadarm2 and the pair will then install and test the new joint.

The Endeavour astronauts were awakened at about 5 a.m. EDT to the sounds of Willie Nelson's "On the Road Again," selected for returning Expedition 4 astronaut Carl Walz by his family.