UCAS-D Flight Slips, Sea Trials On Track

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Amy Butler abutler@aviationweek.com

First flight of the U.S. Navy's Northrop Grumman X-47B unmanned combat air system demonstrator has slipped into the first quarter of 2010 after propulsion acoustic and engine-start sequencing issues uncovered during ground checkout at Edwards Air Force Base, Calif., forced adjustment and additional testing....

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