The March 29 crash of a $45 million Global Hawk unmanned aerial vehicle occurred when the UAV, flying at 41,000 feet over a range at China Lake, Calif., inadvertently received a test signal for flight termination from another range at Nellis AFB, Nev., the Air Force said yesterday. The Nellis range "was outside the frequency coordination zone in which the UAV's mission was being flown," the AF said. The signal, it said, "caused Global Hawk to go into a termination maneuver ...

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