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Discovery astronauts prepare for repairs
(AP)
Updated: 2005-08-02 20:21
Discovery's astronauts are preparing for a high-stakes task that's never
before been attempted: sending a spacewalker beneath the craft to repair filler
sticking out from ship's thermal tile belly, the Associated Press reported.
NASA says the protruding material could cause dangerous
overheating during re-entry and lead to another Columbia-type disaster.
Astronauts Soichi
Noguchi (L) of Japan and Andy Thomas (R) of Australia work stowing
equipment on the mid deck of the shuttle Discovery August 2,
2005.[Reuters] |
The agency will put astronaut Stephen Robinson on the space station's 58-foot
robotic arm Wednesday as part of an unrehearsed maneuver. The arm will be
operated by astronauts inside the station, who will bend and wrap Robinson
around so he can reach the shuttle's belly.
Once there, he'll tug out the ceramic-fabric filler with his gloved hands. If
that doesn't work, he'll cut away the material, which is sticking out about an
inch from two spots near Discovery's nose.
"I am pretty comfortable with using tools very carefully," Robinson said
early Tuesday during a crew press conference from aboard the space station. "But
no doubt about it, this is going to be a very delicate task. But as I say, a
simple one."
Robinson said the makeshift saw will only be used if other methods to remove
the gap fillers 锟斤拷 one about the thickness of an index card and the other, the
size of three index cards bonded together 锟斤拷 are unsuccessful.
"There won't be any yanking going on at all," Robinson said. "It will be a
gentle pull with my hand. If that doesn't work, I have some forceps. I will give
it a slightly more than gentle pull. If that doesn't work, I saw it off with a
hacksaw."
Deputy shuttle program manager Wayne Hale says if none of the proposed
methods work, there will likely be some head scratching for a day. However, he
says the agency will find another method and try the repair again Thursday or
Friday.
Engineers simply don't know enough about potential problems that could be
caused by the protruding gap fillers, some of which protect tiles from hitting
one another during launch.
"When we first heard about it, I think a number of us did have misgivings,"
Astronaut Andrew Thomas said. "We were concerned about it. We were concerned
about the implications of it."
But after a careful review of information sent from the ground, Thomas said
he believes the repairs are justified given "every indication is that the
removal of the material should be pretty straightforward and pretty easy."
Hale said the decision to attempt the repairs was simple and a way "to set
our minds at rest."
"The bottom line is there is large uncertainty because nobody has a very good
handle on the aerodynamics at those altitudes and at those speeds," Hale said.
"Given that large degree of uncertainty, life could be normal during entry or
some bad things could happen."
Discovery Commander Eileen Collins told Mission Control early Tuesday that
her crew would reschedule its joint meal with the space station's crew and
instead focus on procedures for the mission's third spacewalk, expected to take
seven hours.
Robinson and his spacewalking partner, Soichi Noguchi, will still install a
tool platform onto the space station. But once the installation is complete, the
spacewalk will alter from the way it was carefully choreographed before last
week's launch.
The last minute changes, however, are conservative and won't be a
cliffhanger, Robinson said.
"It's going to be like watching grass grow," he stressed. "Nothing is going
to happen fast."
Mission Control told Collins that spacewalk trainers would be in early
Tuesday to discuss the repairs with Robinson, who along with Noguchi spent more
than 300 hours training in a pool where they were weighted down to simulate the
zero gravity environment in space.
Spacewalk instructor Cindy Begley said Robinson is going to have to be
careful not to cause any additional damage while under Discovery. He'll have to
secure his safety tethers behind him and leave any tools he won't need for the
repair behind. He will also have to make sure his helmet doesn't bump into the
shuttle's fragile bottom. Aboard Discovery Tuesday, Thomas prepared Noguchi's
and Robinson's spacesuits for Wednesday's early morning outing. He also assisted
the spacewalking pair in constructing a makeshift hacksaw.
Astronauts James Kelly and Wendy Lawrence, meanwhile, were aboard the space
station reviewing how they would operate the station's arm so Robinson's hands
would be close enough to make the repairs, but his feet far enough away not to
cause any additional damage
Kelly and Lawrence seemed pleased with the plan.
"We wouldn't change a thing," Kelly radioed Mission Control. "We think it is
great. We will be ready to fly tomorrow."
Discovery will remain docked at the station until Saturday. The shuttle is
set return to Earth early Monday.
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