NASA Hopes To Resolve Shuttle Valve Problem

By Nancy Atkinson - February 26, 2009 at 7:39 AM UTC | Space Exploration
sts-1191.jpg

Engineers working on the problematic hydrogen flow control valves on space shuttle Discovery have made enough progress that NASA has tentatively set a March 12 launch date for the mission to bring the last set of solar arrays to the International Space Station. NASA said an exact target launch date will be determined as work progresses with the three valves on the shuttle. Launching Discovery in March would allow plans to proceed for the Hubble repair mission, planned for liftoff on May 12 launch with Atlantis, as well as shuttle mission STS-127, also in May. If Discovery is delayed to April, the Hubble flight would slip to around June 2.

At NASA's Kennedy Space Center in Florida, technicians have started removing Discovery's three valves, two of which will undergo detailed inspection, looking to identify what caused damage to the valves during Endeavour's flight in November 2008. Approximately 4,000 images of each valve will be reviewed for evidence of cracks. Valves that have flown fewer times will be installed in Discovery. Engineering teams also will complete analysis and testing to understand the consequences if a valve piece were to break off and strike pressurization lines between the shuttle and external fuel tank. Hardware modifications may be made to the pressurization lines to add extra protection in the unlikely event debris is released.

NASA managers will hold a review on the progress on March 4 and decide if the shuttle will be ready to go for the March 12 date.

Source:

NASA

Nancy Atkinson

Nancy Atkinson

Nancy Atkinson is a space journalist and author with a passion for telling the stories of people involved in space exploration and astronomy. She is currently retired from daily writing, but worked at Universe Today for 20 years as a writer and editor. She also contributed articles to The Planetary Society, Ad Astra (National Space Society), New Scientist and many other online outlets.

Her 2019 book, "Eight Years to the Moon: The History of the Apollo Missions,” shares the untold stories of engineers and scientists who worked behind the scenes to make the Apollo program so successful, despite the daunting odds against it. Her first book “Incredible Stories From Space: A Behind-the-Scenes Look at the Missions Changing Our View of the Cosmos” (2016) tells the stories of 37 scientists and engineers that work on several current NASA robotic missions to explore the solar system and beyond.

Nancy is also a NASA/JPL Solar System Ambassador, and through this program, she has the opportunity to share her passion of space and astronomy with children and adults through presentations and programs. Nancy's personal website is nancyatkinson.com