The U.S. Navy and Northrop Grumman failed to execute a fourth landing attempt of the X-47B onboard the USS George H.W. Bush carrier, and the Unmanned Combat Air System (UCAS) demonstration flight test program has completed its planned “at-sea” trials. The first X-47B demonstrator — Salty Dog 501 — launched from NAS Patuxent River, Md., July 15 but experienced a “minor test instrumentation issue” that prompted officials to scuttle the landing attempt and recall it to the land base, says ...

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