Discovery crew prepares for Florida landing
Posted on: Monday, 17 July 2006, 05:14 CDT
By Deborah Zabarenko
CAPE CANAVERAL, Florida (Reuters) - Space shuttle Discovery astronauts prepared for a Florida landing on Monday at the end of a mission NASA hopes will show the fleet is fit to fly safely, three years after the fatal Columbia accident.
The crew awakened just after midnight to get ready for a scheduled 9:14 a.m. EDT touchdown at Kennedy Space Center, from which they launched on July 4.
"Looking forward to a good day here and hopefully with good weather we will be on the ground here in about eight, 10 hours," flight commander Steve Lindsey radioed to Mission Control at Johnson Space Center in Houston.
To get ready for landing, astronauts closed Discovery's payload bay doors before sunrise at Cape Canaveral.
About an hour before landing, the shuttle crew will fire its twin rockets in a braking maneuver to start its descent from about 200 miles above Earth's surface.
The weather conditions looked favorable for landing, with potentially problematic rain showers dissipating, NASA forecasters said.
If the shuttle cannot land at 9:14 a.m., it will have a second chance at 10:50 a.m. EDT. After that, NASA would have to wait until Tuesday and possibly divert Discovery to Edwards Air Force Base in the California desert.
The shuttle has only enough oxygen to stay in space until Wednesday, NASA said.
The 13-day flight has been almost flawless, giving the troubled U.S. space agency hope it is finally back on track after the 2003 Columbia disaster.
Discovery suffered no damage during launch, which was NASA's key goal, and crew members Piers Sellers and Michael Fossum, who made three spacewalks, performed a repair to the International Space Station critical to future construction of the half-finished $100 billion outpost.
The shuttle also dropped off German astronaut Thomas Reiter at the station, giving it a full three-person crew for the first time in three years.
Discovery launched amid controversy, with NASA's top safety officer saying it was not ready because of doubts that the problem that doomed Columbia had been fixed.
Columbia's wing heat shield was cracked at launch by a chunk of insulating foam falling from the fuel tank, but no one knew it because there was no way to inspect the shuttle during flight.
The spacecraft disintegrated over Texas 16 days later when fiery atmospheric gases penetrated the broken shield during its return to Earth. The seven astronauts on board were killed.
The flyaway foam problem showed up again on a subsequent shuttle flight last summer.
But, after further changes, Discovery's fuel tank shed only small bits of the insulation during the July 4 launch.
Extensive in-flight inspections with cameras and sensors on the shuttle's robot arm found the flecks had done no harm and Discovery was pronounced to fit to withstand the scorching return to Earth.
Spacewalkers Sellers and Fossum also tested techniques to reach and repair heat shield damage should it occur.
NASA has spent $1.3 billion on safety upgrades since Columbia.
The space agency plans to fly 16 shuttle missions to finish the International Space Station, which is sponsored by 16 nations. Its next flight is scheduled for launch around August 28.
Source: REUTERS
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