Volume: 03, Issue: 17 08/24/2005 
STS-121 crew, from left: Stephanie Wilson and Michael Fossum, mission specialists; Steven Lindsey, commander; Piers J. Sellers, mission specialist; Mark E. Kelly, pilot; and Lisa M. Nowak, mission specialist. Image courtesy NASA.
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STS-121 mission patch. Image courtesy NASA.
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Space Shuttle Discovery still joined to the SCA, on the tarmac at Kennedy Space Center, Fla. Image credit: NASA/KSC.
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Other Articles in This Issue:
International Space Station Will Host Civilian
Mars Reconnaissance Orbiter Hurtles Toward the Red Planet
Spacewalk Ends Early for Space Station Crew
Study Weightlessness through Electronic Field Trip

Discovery to Launch Again in March

Space Shuttle Discovery has been pegged to take another trip to the International Space Station, with launch now slated for March. NASA has adjusted its plans for the STS-121 mission, changing both the launch timeframe and the orbiter to be used.

STS-121 is the second test flight in the Shuttle Return to Flight sequence. Originally set to launch in September, Space Shuttle Atlantis was to carry a crew to the International Space Station.

"We are giving ourselves what we hope is plenty of time to evaluate where we are," said NASA Administrator Michael Griffin. "We don't see the tasks remaining before us being as difficult as the path behind us."

Based on NASA's self-imposed optimum lighting requirements, the earliest possible launch opportunity for the STS-121 mission is March 4, 2006. Pushing back the launch to March or later will allow engineering teams more time to properly evaluate the issue of large pieces of insulating foam that came off Discovery's external fuel tank during launch last month.

Targeting March also allows the Space Shuttle Program to put itself into a better posture for future Shuttle missions to the Space Station. Changing Orbiters for the STS-121 mission enables use of Atlantis for the following mission, STS-115, which will resume assembly of the Station.

The switch frees Atlantis to fly the remaining Space Station truss segments, which are too heavy for Discovery, in 2006. By changing the Orbiter lineup, the Shuttle program will not have to do two back-to-back missions with Atlantis, as previously scheduled.

"It really makes sense to move to the March timeframe," Associate Administrator for Space Operations Bill Gerstenmaier said. "We're looking at the Shuttle missions to support the most robust flight sequence for the Space Station and to make the whole sequence flow better. This extra time helps us make sure that all the work we need to do fits and that there are no other issues."

Discovery's recent STS-114 mission and the STS-121 mission are test flights. They will enable NASA to evaluate new safety procedures and equipment, giving the agency greater confidence that the Shuttle can be flown safely through its planned retirement date of 2010.

Discovery returned to Kennedy Space Center atop a Shuttle Carrier Aircraft on Aug. 21. The external fuel tanks will be shipped back to the Michoud Assembly Facility in Louisiana for tests and potential modifications.

For information about the STS-114 Return to Flight mission and future Shuttle flights, visit http://www.nasa.gov/returntoflight .

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