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.Low-speed taxi tests are now expected to begin no later than December, a Navy statement announced this afternoon, adding that sea trials of the carrier-capable UCAS-D remain on schedule for 2012.
More information could not be immediately obtained from the Navy.
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