By Alexandra Skores, Pete Muntean, CNN

Washington (CNN) — The first of the National Transportation Safety Board’s three days of investigative hearings is underway to help determine what caused the deadly midair collision on January 29 between an Army helicopter on a training mission and American Airlines flight 5342, operated by PSA Airlines, landing at Ronald Reagan Washington National Airport.

Transcripts of the cockpit voice recorders and air traffic control audio released in the docket for Wednesday’s hearing reveal what was said inside the aircraft in the moments before the crash.

As the passenger jet approached the airport, inside the helicopter the instructor was asking the pilot to descend.

“You’re at three hundred feet, come down for me,” the transcript from the cockpit voice

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