NTSB investigators said the helicopter, which crashed into a hillside, also lacked a terrain avoidance warning system, something the transportation safety agency also has long recommended be standard. ADADJennifer Homendy, the NTSB board member leading the investigation, highlighted the long-standing recommendations at a news conference Tuesday. Experts say most of the time, helicopter pilots fly under what are known as visual flight rules, seeing and avoiding obstacles, like drivers. Investigators also loaded flight data from the crash onto a drone to fly the route for themselves. The NTSB credited the data with allowing investigators to identify an urgent safety issue that affected all S-76s.

Source: Washington Post January 28, 2020 23:34 UTC