For the barrel roll, the AMC Hornet had to be modified significantly—to improve weight distribution its engine was moved further behind the front axle and central-steering was fitted. The Hornet’s builder, stunt driver Jay Milligan, also equipped. “All evidence points to a blocked engine drain line,” said the plaintiff’s attorney, Gary C. Robb, in a news release. Robb is a Missouri-based expert in helicopter-related litigation. Robb said the plaintiffs believe…