Federal investigators have found that the pilot of a plane that crashed near Glencoe earlier this year was not equipped or trained to fly in low clouds. Stuart Dahlberg of Brooklyn Center and his wife and mother all died when their single-engine Beechcraft Bonanza went down in a farm field near Glencoe in March. A new National Transportation Safety Board report says the plane did not have the instruments necessary to fly without normal visibility. It also says that Dahlberg was not certified to fly by instruments when he flew into low clouds before his plane crashed. Dahlberg apparently lost control of the plane and it broke apart in midair, leaving a 900-foot-long swath of debris across two fields.