Investigators have found that a fuel leak was to blame for a malfunction in the Pratt & Whitney Rocketdyne RL10 upper stage engine during the Oct. 8 launch of a Global Positioning System satellite aboard a Delta IV rocket. Despite diminished thrust in the upper stage, the third Boeing GPS IIF spacecraft made it to orbit in what Air Force Space Command chief Gen. William Shelton called a “diving save.” Shelton ordered an accident investigation board convened to explore what went ...

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