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The NTSB released a minute-by-minute report on the midair collision near Ronald Reagan National Airport that killed all 67 people aboard the US Army helicopter and commercial airliner. The NTSB is investigating whether the Black Hawk helicopter provided pilots with bad data, including altitude information. Five minutes before the collision, the pilot flying indicated they were at 300 feet, while the instructor pilot indicated 400 feet.
Investigators are also examining whether the helicopter crew heard two key messages from air traffic control. Three minutes before the collision, ATC alerted the helicopter that the airliner was circling to a different runway, but CVR data suggests this may not have been received by the Black Hawk crew. Seventeen seconds before the crash, ATC instructed the helicopter to pass behind the jet, but this transmission was interrupted. One second before impact, the airliner pulled up and started a turn. Investigators believe the Black Hawk pilots were wearing night vision goggles, and the NTSB will investigate how this may have impacted their ability to see the airliner.