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Investigators said the flight data recorder suggested that Black Hawk's barometric altimeters, that measure height, showed the pilot that the aircraft was flying 80 to 130ft lower than its actual altitude. "There is a possibility that what the crew saw was very different than what the true altitude was," NTSB Chairwoman Homendy said. Army officials at the hearing said that discrepancies of up to 100ft were not a cause for alarm in the helicopter because pilots are expected to maintain their altitude plus or minus 100 ft.