The pilot of the Black Hawk helicopter that collided with the CRJ, Army Captain Rebecca Lobach, did not comply with directions to change course seconds before the fatal incident.
On the night of January 29, Lobach was conducting an annual flight evaluation with her co-pilot Chief Warrant Officer 2 Andrew Loyd Eaves, who was serving as her flight instructor.
Three months on, new details reveal that Lobach made more than one mistake leading to the collision with an AA CRJ.
Not only was Lobach flying her Black Hawk too high, but in the final moments before the impact, she failed to take advice and instruction from her co-pilot to switch course.
Lobach's piloting skills were being tested during the evaluation on the fateful night, before the crew were informed that another aircraft was nearby.
15 seconds before colliding with the CRJ, Reagan National air traffic control told Lobach and Eaves to turn left, but she did not do so.
Seconds before impact, co-pilot Eaves then turned to Lobach in the cockpit and told her that air traffic control wanted her to turn left. She still did not do so.