Malaysia Airliner Communications Shut Down Separately With ‘Manual Intervention’ – US Officials 13 Mar 2014 Two U.S. officials tell ABC News the U.S. believes that the shutdown of two communication systems happened separately on Malaysia Airlines Flight 370. One source said this indicates the plane did not come out of the sky because of a catastrophic failure. The data reporting system, they believe, was shut down at 1:07 a.m. The transponder — which transmits location and altitude — shut down at 1:21 a.m. This indicates it may well have been a deliberate act, ABC News aviation consultant John Nance said. U.S. investigators told ABC News that the two modes of communication were “systematically shut down.” That means the U.S. team “is convinced that there was manual intervention,” a source said, which means it was likely not an accident or catastrophic malfunction that took the plane out of the sky.