William Arthur Heitmann, 66, a retired civilian engineer with the U.S. Army corps of Engineers who had served as a seismic construction consultant, died Jan. 15 in Fairfield, Pa., after a heart attack. He had moved there from Gaithersburg in 1977.

Mr. Heitmann had joined the Corps of Engineers in 1939 and had worked in Louisville before coming to Washington in 1956. At the time of his retirement in 1975, he was chief of the structural section of the Military Construction Directorate in the office of the Chief of Engineers.

He was born in Dayton, Ohio, and grew up in Oakwood, Ohio. He was a graduate of the University of Cincinnati School of Engineering.

Mr. Heitmann was a member of the American Concrete Institute, the Society of Military Engineers and the American Society of Civil Engineers. He belonged to the Gettysburg Presbyterian Church.

Survivors include his wife, the former Marguerite Michel, of Fairfield; two daughters, Helen Ives of Bethesda and Melinda Hinners of Las Vegas; two sisters, Esther Lybrook and Louise Heitmann, both of Dayton, and four grandchildren.

The family suggests that expressions of sympathy be in the form of contributions to the book fund of the Gettysburg, Pa., Public Library.