The powered portion of flight for an Atlas V boosting the third U.S. Air Force X-37B Orbital Transfer Vehicle (OTV) has successfully completed, according to Pratt & Whitney Rocketdyne officials. The company makes the RL10 engine for the Centaur upper stage. The RL10 malfunctioned during the last U.S. Air Force launch in October owing to a fuel leak. Officials have not yet said how the leak occurred, though they know it happened when pressure in the chamber was at its peak. Some ...


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