US probing 'bad data' possibly used by Black Hawk crew before deadly crash, official says
The National Transportation Safety Board is examining "bad data" the crew of an Army Black Hawk helicopter may have relied ...
960 The Ref on MSN17m
Army helicopter, plane crash: NTSB gives investigation update
The National Transportation Safety Board provided an update on Friday into the investigation of the deadly Army Black Hawk helicopter and American Airlines flight collision.