The National Transportation Safety Board says altimeter in the Black Hawk helicopter may have malfunctioned before the DCA ...

Investigators say the crew of the helicopter that collided midair with an American Airlines jet might not have heard key air ...

Black Hawk pilots may not have heard a critical directive from air traffic control to fly behind the American Airlines plane ...

The radio altimeter on board the Black Hawk at the time of the deadly midair collision was 278 feet, Homendy said. That altimeter uses a radio beam to show the helicopter’s altitude above ground level ...

NTSB's Friday briefing about the fatal midair collision near DCA highlighted ongoing investigations into potential radio ...

Last month, an American Airlines passenger jet and an Army helicopter collided as the plane prepared to land at Washington ...

There's no indication the U.S. Army Black Hawk crew could tell there was an impending collision before its devastating crash ...