R. Fabian Goranson, 65, a retired aeronautical engineer who worked on the design of supersonic transports for the Federal Aviation Administration, died of cardiac arrest Wednesday at Fairfax Hospital.

Mr. Goranson, who lived in Falls Church, was born near Stockholm, Sweden, and grew up in Enumclaw, Wash. He earned a bachelor's degree in aeronautical engineering at the University of Washington.

During World ywar II, he joined the National Advisory Committee for Aeronautics at Langley, Va., where he worked on aircraft designs. In the late 1940s, he moved to the Washington area and joined the Navy Department, where he also worked on aircraft design. About 1952, he returned to NACA, which became the National Aeronautics and Space Administration in 1957, as a senior engineer responsible for the structural development of high-speed aircraft and space vehicles. During his years here, Mr. Goranson earned a master's degree in engineering administration at George Washington University.

In 1962, he joined the FAA, now part of the Department of Transportation, and was assigned to the design of supersonic transport planes. tIn 1972, when a decision was made to shelve plans for a supersonic transport, Mr. Goranson transferred to the National Highway Safety Administration in DOT and helped develop guidelines for automotive safety until his retirement in 1976.

Mr. Goranson received several citations from the government during his career. He was a member of Tau Beta Pi, a professional engineering society.

Survivors include his wife, Alice L. Goranson, and one daughter, Annette P. Goranson, both of Falls Church, and two brothers, Phillip and Rune F. Goranson, both of Seattle.