The shuttle Discovery is on the pad poised for liftoff set for Monday night, but mother nature could postpone the launch until Tuesday. Fla. Forecasters say that there is a 70 percent chance of winds and rain that could keep the shuttle grounded. Thursday's launch of Discovery was scrubbed because of a faulty valve and a bolt problem which are both fixed now. NASA officials announced Sunday morning that crews replaced the valve on the shuttle that controls the flow of fuel during launch.
Officials say that the valve has passed tests changes and it is ready for flight.
A team of engineers is still trying to figure out if a bolt problem they found onboard the shuttle Atlantis could be a problem aboard the Discovery. Engineers discovered one of the bolts connecting the orbiter to the external fuel tank did not retract properly. This could cause the tank to tumble and collide with the orbiter. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.