WASHINGTON — The National Transportation Safety Board began a three-day investigative hearing Wednesday to reveal new information and question experts about the fatal collision of a U.S. Army Black Hawk helicopter and American Eagle Flight 5342 in January.

The hearings were expected to bring in testimony from the U.S. Army, the Federal Aviation Administration, the NTSB and experts in the manufacture of helicopter avionics. A live stream of the hearing can be found here.

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The first panel Wednesday was set to examine possible issues with the Black Hawk helicopter’s altimeters and air data systems. Follow along with our live blog of the hearing below:

Panel 1: Overviews of Acci

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