March launch of Discovery possible, but not certain

NASA managers today ordered engineers to replace suspect hydrogen flow control valves aboard the shuttle Discovery with valves that have less flight time in a bid to reduce the chances of in-flight cracks that could lead to debris in a pressurization line. If ongoing tests and higher fidelity computer models continue to show positive results, Discovery could be cleared for a delayed launch attempt by around March 12, sources said today. That would give NASA just two or three launch opportunities before standing down until April 7 to avoid conflict with a Russian Soyuz mission to the international space station. More

(Source: SpaceFlightNow.com - Feb 25)