The NTSB gave an update on its investigation into the Potomac River crash between an American Airlines jet and an Army helicopter in January.

That transmission was interrupted — it was stepped on,” said Jennifer Homendy, chair of the National Transportation Safety Board.

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.

Investigators revealed on Friday the crew of the Army Black Hawk helicopter that collided in midair with an American Airlines jet near Ronald Regan National Airport in Washington, DC, last month may not have heard critical instructions from air traffic control prior to the fatal accident.