The National Transportation Safety Board said the helicopter’s cockpit voice recorder didn’t capture key directions from air-traffic control and is investigating whether the crew might have seen a different altitude on the flight instruments.

The National Transportation Safety Board is examining "bad data" the crew of an Army Black Hawk helicopter may have relied upon prior to their deadly crash with a passenger jet outside Washington D.C.

Investigators probing the deadly collision between a U.S. Army Black Hawk helicopter and an American Airlines jet near Washington, D.C.'s Ronald Reagan National Airport on January 29 have determined that the helicopter crew may have missed crucial air traffic control instructions and received inaccurate altitude data in the moments leading up to the crash.