1: Investigators trying to determine what caused the crash of Germanwings Flight 9525 have made a startling discovery in an audio recording , according to a New York Times report : One of the plane 's pilots was locked out of the cockpit before the crash . 2:  You can hear he is trying to smash the door down ,  a senior military official involved in the investigation told the newspaper , describing audio from the cockpit voice recorder , one of the plane 's black boxes . 3: Report : Audio recording includes sounds of pilot trying to smash down cockpit door .
1: an audio recording 2: cockpit voice recorder 3: Audio recording