Hubble repair passes 'speed bump'

— -- Astronauts narrowly avoided disaster Thursday during their first spacewalk to upgrade the Hubble Space Telescope, but the more treacherous tasks still await them.

Astronaut Andrew Feustel on Thursday successfully wrenched out a stubborn bolt that, if it had broken off, could have blocked installation of a $132 million camera on Hubble. The camera is one of astronomers' highest priorities for this mission, the fifth and final visit to fix and modernize the Hubble.

Atlantis' astronauts headed out for another spacewalk Friday, this time to give Hubble some new, badly needed gyroscopes and batteries.

Replacing Hubble's gyroscopes is the top priority for this final repair mission to the 19-year-old observatory. The gyroscopes are part of the telescope pointing system, and half of the old ones are broken.

The two spacewalkers —Michael Massimino and Michael Good — ventured out as the shuttle and anchored telescope sailed 350 miles (560 kilometers) above the Atlantic Ocean.

"It is a beautiful day outside," Massimino said. "Anybody home?" he joked.

He had a brief fright when his communication system fouled up. For a minute or two, no one could not hear him. "That was scary," said one of the astronauts inside when the problem cleared up. "A little bit," Massimino replied.

Massimino, a returning Hubble mechanic who is over 6 feet (1.83 meters) tall, was going to squeeze himself into Hubble to replace the six gyroscopes. Despite the tight fit, NASA expected the work to be relatively straightforward; two gyroscopes are bundled together, for a total of three compact, 24-pound (11-kilogram) boxes.

These gyroscopes were installed 10 years ago. Three no longer work, and two others have been acting up. That left one perfect gyro, but it has seen a lot of use.

There will be no weekend off for Feustel and the other six crewmembers of space shuttle Atlantis, which pulled up to the Hubble on Wednesday. In the next few days, they'll undertake work so difficult that NASA is downplaying their chance of success.

"Today was a speed bump," Hubble senior scientist David Leckrone said. "Two days from now is going to be the hold-your-breath day."

What's planned:

•On Saturday, Feustel and astronaut John Grunsfeld will attempt the first-ever repair on a Hubble scientific instrument while in orbit. Fixing the Advanced Camera for Surveys requires them to remove tiny screws that they won't be able to see — while wearing bulky space gloves.

"This will be a nail-biter all the way," Grunsfeld said before Atlantis' May 11 launch.

•On Sunday, astronauts Massimino and Good will try to mend another broken scientific instrument. To bring the Space Telescope Imaging Spectrograph back to life, they'll have to undo more than 110 screws not much bigger than watch screws.

The telescope could be crippled if a single stray screw floats into it.

"I don't know exactly how it's going to turn out," Massimino said before launch. "A lot of miracles have to occur."

The scientific instruments on Hubble — unlike its standard components, such as the observatory's batteries — were not designed to be fixed in orbit. So it's extraordinarily difficult to access them. Hubble's managers decided the two instruments are so scientifically valuable that it's worth the risk to try to repair them.

If the astronauts pull off the repairs, Hubble will have five functional scientific instruments for the first time since 1993, but Hubble's overseers are trying to tamp down expectations.

"On this mission, the final mission, we're going for broke," Leckrone said.

Thursday's spacewalk was not expected to be challenging, but the astronauts encountered an unexpected obstacle as they tried to remove a scientific instrument known as Wide Field Planetary Camera 2.

The camera has been a scientific workhorse, but it's 15 years old, and its replacement will be 15 to 35 times more powerful. Astronomers are eager to start using the new camera.

When Feustel tried to undo the bolt holding the old camera on the telescope, it balked. He tried several combinations of ratchet and power drill, with no luck. For a moment, it looked like the new camera would travel back to Earth rather than remaining on Hubble.

With one tool change and one more application of muscle, Feustel pried the sticky bolt open. "It's been in there for 16 years, Drew, and it didn't want to come out," Grunsfeld said.

"It just decided to be a recalcitrant teenager," said Massimino, who was supervising the spacewalk from inside Atlantis and has two teenage children.

Feustel and Grunsfeld sailed through the installation of a new electronics box to replace one that failed last year, but they ran into trouble again as they tried to install mechanisms to make it easier to open the telescope's access doors.

They successfully installed two, but the third didn't fit properly.

"In traditional Hubble fashion, Hubble threw us a few curves," Grunsfeld said.