Discovery to go Mar 12

Popped into Spaceflight Now to get the poop on Discovery...

NASA says they're confident about space shuttle Discovery's valve problem. Still, they will replace the values with less-used ones. Discovery could launch on March 12. They could push a couple of days but that would impact on other International Space Station activities.

If they successfully launch in March, then NASA can proceed with the May 12 launch of the Hubble Servicing Mission (SM4). If Discovery is delayed, that will push the SM4 to June 2.