LOS ANGELES — Northrop Grumman’s X-47B unmanned combat air system (UCAS-D) demonstrator successfully completed its long-delayed first flight at Edwards AFB, Calif., on Feb. 4. The stealthy, single-engine UCAS took off early in the afternoon Pacific time and landed some 29 min. later, having achieved an altitude of 5,000 ft. Aimed at gathering air vehicle management system data, the first flight also marks the start of a roughly 50-flight, year-long Block 1 envelope expansion test ...


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