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NASA ready to roll out SLS

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NASA is ready to roll out the first Space Launch System rocket this week for a countdown rehearsal ahead of a launch later this year. 

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Agency officials said at a March 14 briefing that they had completed reviews for the scheduled March 17 rollout of the SLS from the Vehicle Assembly Building  

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Rollout is scheduled to begin at approximately 5 p.m. Eastern and take 11 hours to reach the pad. 

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The propellant loading process, which took about two and a half hours for the shuttle, will take eight hours for the SLS despite its use of shuttle-heritage hardware. 

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A second reason is that the SLS has an upper stage that must also be fueled, requiring personnel to stagger the loading of the two stages. 

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After the dress rehearsal, NASA anticipates spending eight to nine days working on the vehicle for post-test operations and servicing before rolling it back to the VAB for final launch preparations 

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