sentences:  Hegenberger retired August 31, 1949.In 1958 he was recognized for his demonstration of the capability of four-course radio range beacons as a navigational aid by the Professional Group on Aeronautical and Navigational Electronics, a member of the Institute of Electrical and Electronics Engineers, receiving its annual "Pioneer Award", and in 1976 was enshrined in the National Aviation Hall of Fame.He died of pneumonia in Goldenrod, Florida on August 31, 1983.