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NASA astronauts face hardest spacewalk to finish repair

(Agencies)
Updated: 2008-11-22 20:15

CAPE CANAVERAL -- Astronauts up on the international space station faced the longest and hardest spacewalk of their mission Saturday, a seven-hour-plus excursion to wrap up repair work on a gummed-up joint.

In this image provided by NASA astronaut Shane Kimbrough participates in the mission's second scheduled session of extravehicular activity Thursday Nov. 20, 2008 as construction and maintenance continue on the International Space Station. [Agencies]

As the crews of the orbiting shuttle-station complex focused on the greasy outdoor extravaganza, engineers back on Earth struggled to understand a potentially serious problem with a newly delivered recycling system that is supposed to turn astronauts' urine into drinking water.

Related readings:  Astronauts end space walk marred by lost tool bag  Astronauts hitch giant crate to space station  Astronauts prepare to unpack Endeavour's cargo  Purified urine to be astronauts' drinking water

The $154 million system shut down again Friday and had managers wondering whether space shuttle Endeavour would bring back any samples of processed urine. The equipment has to work properly and the water has to pass safety tests in order for the space agency to double the size of the station crew next year.

At a news conference Friday, astronaut Heidemarie Stefanyshyn-Piper said her upcoming spacewalk - the third of the mission - would be busier than usual. She and Steven Bowen have to finish cleaning and lubricating a jammed solar wing-rotating joint, and put in new bearings.

"It looks like it's going to be challenging," she said. "We have a lot of work to do."

Late Friday, Stefanyshyn-Piper and Bowen got permission to take out an extra tool. Mission managers decided a caulking gun set aside for potential repair work on Endeavour's heat shield could double as a grease gun in a pinch.

The astronauts ended up with a grease gun shortage after a $100,000 tool kit floated away during Tuesday's spacewalk. Stefanyshyn-Piper was trying to clean up grease that had leaked all over when the bag and the tools inside got away.

The joint is supposed to keep the solar wings on the right side of the space station pointed toward the sun. It stopped working normally more than a year ago, after grinding parts left it full of metal grit.

Unlike the two previous spacewalks, only joint repair work is on Saturday's outdoor agenda. A fourth and final spacewalk, on Monday, will have astronauts adding grease to a twin joint on the opposite side of the space station that is working fine.

As for the trouble with the water recycling system, no one was surprised.

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