Author: The Associated Press

WASHINGTON (AP) — National Transportation Safety Board members were deeply troubled Tuesday over years of ignored warnings about helicopter traffic dangers and other problems, long before an American Airlines jet and an Army Black Hawk collided a year ago, killing 67 people near Washington, D.C.

The placement of a helicopter route in the approach path of Reagan National Airport’s secondary runway created a dangerous airspace and a lack of regular safety risk reviews made it worse, the board said. That was a key factor in the crash along with air traffic controllers’ over reliance on asking helicopter pilots to avoid other aircraft.

So many things went wrong last Jan. 29 to contribute to the deadliest plane crash on American soil since 2001 that the National Transportation Safety Board isn’t likely to identify a single cause of the collision between an airliner and an Army helicopter over the Potomac River at its hearing Tuesday.

Instead, their investigators will detail what they found that played a role in the crash, which killed 67 people, and the board will recommend changes to help prevent a similar tragedy. Last week, the Federal Aviation Administration already took the temporary restrictions it imposed after the crash and made them permanent to ensure planes and helicopters won’t share the same airspace again around Reagan National Airport.

The U.S. government admitted Wednesday that the actions of an air traffic controller and Army helicopter pilot played a role in causing a collision last January between an airliner and a Black Hawk near the nation’s capital, killing 67 people.

It was the deadliest plane crash on American soil in more than two decades.