https://www.youtube.com/watch?v=t7EAlTcZFwY
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Officials said the control tower recorded the Black Hawk helicopter flying at an altitude of 200 feet at the time of the collision, in line with its maximum allowed altitude for its flight path.
However, data from the passenger jet’s flight recorder showed the collision occurred at an altitude of around 325 feet, plus or minus 25 feet.
https://www.theepochtimes.com/us/ntsb-conflicting-altimeter-data-retrieved-after-midair-collision-near-washington-5802839?utm_medium=app&c=share_pos1&pid=iOS_app_share&utm_source=iOS_app_share
NTSB: Conflicting Altimeter Data Retrieved After Midair Collision Near Washington
The control tower data for the Black Hawk helicopter have revealed a significant discrepancy in altitude readings, investigators say.