Over three days of sometimes contentious hearings this week, the National Transportation Safety Board interrogated Federal Aviation Administration and Army officials about a list of things that went wrong and contributed to a Black Hawk helicopter and a passenger jet colliding over Washington, D.C., killing 67 people .

The biggest revelations: The helicopter’s altimeter gauge was broken, and controllers warned the FAA years earlier about the dangers that helicopters presented.

At one point NTSB Chairwoman Jennifer Homendy scolded the FAA for not addressing safety concerns.

“Are you kidding me? Sixty-seven people are dead! How do you explain that? Our bureaucratic process?” she said. “Fix it. Do better.”

Victims of the January crash included a group of elite young figure skaters

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