Originally Posted by newcigarz (Post 289588)

Don't think so. Excerpt from the launch blog




Press to ATO
Sun, 15 Mar 2009 07:49:13 PM EDT

If one of Discovery's main engines were to fail at this point, the orbiter would still be capable of reaching orbit in an "Abort to Orbit" abort mode, known as ATO. However, Discovery's engines are performing well as the orbiter and its crew of seven continue on a path toward the International Space Station.


Press to MECO
Sun, 15 Mar 2009 07:50:17 PM EDT

At this point, Discovery can make it into orbit even if one engine failed. However, all three space shuttle main engines are performing as expected.