During the hearings, the NTSB was told that the Army helicopter never heard the command from the air traffic controller to "pass behind the CRJ" as the transmission was stepped on. It was also revealed that the plane's pilots were not warned by the controller that there was a helicopter nearby or cleared to fly near the helicopter.

Investigators have found that a helicopter involved in a deadly crash with a passenger plane over Washington was flying above its height limit. The helicopter's altitude-measuring instrument was also inaccurate.

At their closest points, helicopters and planes routinely flew within 75 feet near the airport, according to the NTSB.

The National Transportation Safety Board (NTSB) is holding a three-day hearing on the deadly plane crash at Reagan Airport that took the lives of 67 people in January. The hearings began Wednesday morning.

Photo / Petty Officer 1st Class Brandon Giles, US Coast Guard via ) Investigators painted a devastating picture today of numerous mistakes and government failures that converged at a tragic point 85m above the Potomac River on January 29,

Last week, the NTSB held three days of hearings looking into what led up to the fatal crash between a plane and a helicopter in January.