Sources say two communications systems on Malaysia Airlines Flight 370 stopped working, one after the other, before the flight vanished from civilian radar screens
Sources say two communications systems on Malaysia Airlines Flight 370 stopped working, one after the other, before the flight vanished from civilian radar screens. Veteran crash experts say a cascading series of electrical faults may cause that type of sequential failure, but it's also possible someone on the plane deliberately turned the systems off. Bob Orr reports.
