Federal investigators say an air traffic controller's radar display didn't show the location and altitude of a paraglider when a small plane was placed on a collision course with it near Houston last month.
In a preliminary report Friday, National Transportation Safety Board investigators said the powered paraglider lacked a transponder or other tracking equipment when hit by the single-engine plane.
That meant the controller was unaware of placing the Cessna pilot on a collision course, resulting in a Dec. 21 crash that killed both pilots.
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Copyright Associated Press