Overview

• Investigators are examining conflicting altitude data from the Black Hawk helicopter, suggesting the pilots may have had inaccurate information during the flight.
• The helicopter crew possibly missed a critical air traffic control instruction to pass behind the American Airlines jet seconds before the collision.
• The Black Hawk was flying above the 200-foot altitude limit for its route, but it is unclear if the pilots were aware due to discrepancies between altimeter readings.
• Night vision goggles worn by the Black Hawk crew may have impaired their visibility during the nighttime training flight.
• The Federal Aviation Administration has restricted helicopter and airplane traffic in shared airspace near Reagan National Airport following the crash.