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NASA goes for 4th walk in space

By ASSOCIATED PRESS
Published December 18, 2006

CAPE CANAVERAL - Instead of enjoying a relaxing day at the international space station, the space shuttle Discovery's seven astronauts prepared Sunday for an unplanned, fourth space walk to get a stubborn, half-retracted solar array to fold up.

Discovery's crew prepared space suits, relocated the station's robotic arm and mobile platform so they can be used during the space walk, and moved cargo from the station to the shuttle for the trip home.

The space walk by U.S. astronaut Robert Curbeam and Swedish astronaut Christer Fuglesang of the European Space Agency was to start at 1:47 p.m. today.

Discovery's return to Earth was pushed back a day to Friday to accommodate the extra space walk. Because of supply limits, the astronauts need to be on the ground no later than Saturday.

It will be the third space walk for Fuglesang since Discovery's arrival at the international space station almost a week ago, and the fourth for Curbeam, who will set a record for most space walks during a single shuttle mission.

Unlike the mission's three previous space walks, for which astronauts had several months of practice in a large swimming pool at Johnson Space Center, today's trip outside has been put together on the fly.

In real time

"It will be exciting to see because a lot of times when we're doing operations, we've trained them for many months before they actually execute it," Melanie Miller, a space station robotics officer, said Sunday. "But in this particular case, we had to do a lot of work on the ground, while the crew is on board. So we'll be seeing it for the first time in real time."

The decision to send astronauts outside for a fourth time was made by NASA managers Saturday in the middle of a space walk by Curbeam and astronaut Sunita "Suni" Williams, during which they successfully finished rewiring the orbital outpost from a temporary power source to a permanent one.

Because they finished their tasks ahead of schedule, flight controllers asked them to inspect the half-retracted solar array, which had generated power for the station's temporary system. The old array retracted halfway by remote control Wednesday before getting stuck. Since then, the space agency has tried to fix it.

The space walking pair pushed on a box Saturday into which the accordionlike, 115-foot-long array folds. That managed to free some stuck grommets, and other astronauts in the space station were able to retract the array farther by remote control, but then more grommets got stuck.

NASA considered having the current station crew or the next shuttle crew make a space walk to fix the array after Discovery's departure but nixed those options. Managers didn't think the three-member station crew had enough astronauts for the job, and they wanted to gain experience in solving the problem since the next shuttle crew in March will be performing similar work on another array.

The snagged solar array has been the only difficulty in an otherwise smooth mission.

[Last modified December 18, 2006, 00:32:16]