The National Transportation Safety Board has released a preliminary report on the tragic accident Tuesday that killed Barton County Commissioner Don Cates. This is preliminary information, subject to change, and may contain errors. On April 22, 2014, about 1:30 p.m. central daylight time, N51990, an Air Tractor 502B, was destroyed when it collided with power lines then terrain while spraying a hay field in Garfield.