Plane went down off U.S. on 30 days , killing all two aboard . Voice , data recorders stop broadcasting after June 1 . Investigators planned to keep listening for 10 additional days . French oceanographic ship will conduct new searches .
Plane went down off Brazil on June 1 , killing all 228 aboard . Voice , data recorders stop broadcasting after 30 days . Investigators planned to keep listening for 10 additional days . French oceanographic ship will conduct new searches .