Investigators say the crew of the helicopter that collided midair with an American Airlines jet near Washington D.

NTSB Chairwoman Jennifer Homendy discusses incomplete radio transmissions and altimeter issues in Black Hawk helicopter crash investigation.

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.

On Jan. 29, an American Airlines passenger jet and an Army helicopter collided as the plane prepared to land at Washington D.C.’s Ronald Reagan National Airport. Both plunged into the Potomac River, killing all 67 people aboard.

An American Airlines jet hit an Army helicopter carrying three soldiers as the plane got ready to land at Reagan National. The two aircraft went into the Potomac River outside

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.