Thanksgiving Day spacewalk for astronauts
Updated: November 28, 2002

With smooth progress through two spacewalks to install the P1 solar array truss segment, NASA managers say there are no plans to extend the shuttle Endeavour's mission beyond the currently planned Dec. 4 landing date.

"We have completed EVA-2," flight director Robert Castle Thursday evening. "The EVA went very, very well. We picked up everything we planned to do, as well as a couple of get-aheads.

"As far as other things going on, the (supply and equipment) transfers are continuing, we think we're on track with all of that. Crew handover, of course, we're continuing to do crew handover briefings to bring the new (space station) crew up to speed on things going on and how things really work.

"All that's gone very well," Castle concluded. "EVA-3 is still on schedule for Saturday and then the plan would be to continue to undock on Monday and to land on Wednesday. So at this time, there's no move to extend the mission any. We're still looking at a nominal-length mission."

Lead spacewalk officer Dana Weigel said spacewalkers Michael Lopez-Alegria and John Herrington accomplished all of their Thanksgiving Day objectives, and then some. Two fluid jumpers were installed on ammonia lines between the central S0 truss and the new P1 extension that will permit ammonia coolant to flow with the thermal control system is activated next year.

Four spool positioning devices, or SPDs, were installed on ammonia quick-disconnect fittings to prevent potential problems with internal leakage and over pressurization. Both of the massive keel pins that helped hold P1 in the shuttle Endeavour's cargo bay were stowed and a second wireless TV antenna was installed to provide spacewalk "helmet cam" views when the shuttle isn't there.

A new CETA astronaut cart was moved from P1 to the far side of the solar array truss to clear the way for upcoming movements of a transporter used to anchor the station's Canadarm2 crane to various work sites on the truss. And finally, seven of 18 launch locks holding P1's ammonia radiators in place were released as a get-ahead task.

Either end of the station's robot arm can plug into power-and-data grapple fixtures at various points on the station's exterior. The free end of the arm can then be used to move astronauts or equipment from point to point. As Herrington and Lopez-Alegria are gearing up for Saturday's third and final spacewalk, the robot arm will start out mounted on the U.S. Destiny lab module. Flight controllers then will command the mobile transporter to move along tracks on the forward face of the truss, from work site 4 to work site 7 at the far end of P1.

The free end of the robot arm then will be commanded to latch onto the MT and to release the grapple fixture on the lab. The arm must be at work site 7 to complete the objectives of the spacewalk. When the EVA is over, the arm will move back to the lab and the MT will be commanded to move back to work site 4.

"The sequence for that day is the crew starts getting into the suits, the MT moves out to the end of the P1 truss," Weigel said. "Then the SSRMS will do a walkoff onto the MT, and by the time we get out the door, it's in position for our first task."

"The entire (MT) procedure is bookkept for an hour and a half. Part of that is the unlatching of the mobile transporter, unplugging it from its electrical source and the drive time. It moves at about 1.2 inches per second."

Total distance travelled will be about 55 feet.

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