Astronauts Scott Parazynski and Doug Wheelock began repressurizing the Quest airlock module at 1:22 p.m. to close out a dramatic seven-hour 19-minute spacewalk after successfully repairing a mangled space station solar array. A few minutes earlier, commands were sent to put full tension on the repaired P6 array and the lab's left-side solar panels were cleared for normal sun-tracking operation.

Today's spacewalk, the fourth and final excursion for the Discovery astronauts, pushed the crew's total EVA time to 27 hours and 14 minutes. Parazynski now ranks fifth in the world in cumulative spacewalk time with 47 hours and five minutes over seven EVAs.

With the P6 solar arrays now fully extended, under tension and rotating to track the sun in concert with the inboard P4 arrays, the station has enough power to support the addition of a new European research module as planned in December. The shuttle Atlantis, scheduled for blastoff Dec. 6 to ferry the Columbus research lab into orbit, was moved from its hangar to the Vehicle Assembly Building at the Kennedy Space Center today for attachment to an external tank and solid rocket boosters.

But the schedule is tight and it will be up to station commander Peggy Whitson, Tani and flight engineer Yuri Malenchenko to complete a long list of chores to clear the way for Atlantis' long-awaited mission.

First, Whitson and Malenchenko plan a spacewalk Nov. 9 to finish rigging the newly delivered Harmony module for its move to the front of the space station. Harmony was temporarily attached to the Unity module's left port. On Nov. 12, the crew will use the station's robot arm to move the shuttle docking port from the front of the Destiny lab module to Harmony. Two days later, the Harmony/docking port assembly will be moved to the front of Destiny and bolted in place.

Whitson and Tani plan two more spacewalks, on Nov. 20 and 24, to connect Harmony to the space station's main power and cooling systems. That will set the stage for the Columbus module's attachment to Harmony's right-side port in December. Japanese modules will attached to Harmony's upper and left-side ports in February and April.

With P6 and P4 rotating normally to track the sun, NASA has a bit of breathing room to troubleshoot a problem with the right-side solar alpha rotary joint, or SARJ. Two massive rotary joints, one on each side of the station's main power truss, slowly turn the port and starboard solar arrays to track the sun as the lab complex circles the globe.

During a spacewalk last Sunday, Tani discovered metallic contamination inside the right-side SARJ, indicating a potentially serious bearing or alignment problem. A planned heat-shield repair demonstration spacewalk originallly planned for Thursday was called off to permit a more thorough inspection of the starboard SARJ. Then on Tuesday, the P6 array was damaged during deployment and NASA managers ultimately scrapped the SARJ inspection to make way for today's repair work.

The starboard SARJ issue must be addressed at some point, but any additional inspections and repair work likely will slip into next year. In the meantime, officials say, the station can safely operate with two of its three solar arrays in sun-track mode.

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