Engineers don’t expect three small cracks that appeared in the Orion multipurpose crew vehicle pressure vessel to delay the planned first flight of NASA’s next human spacecraft in 2014. The cracks in three adjacent radial ribs machined into the aft bulkhead did not go all the way through, and the vessel continued to hold pressure after the failure at 21.6 psi, according to a NASA spokeswoman. Part of the human-rating process, the tests are intended to verify engineering models and the ...

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