George Frank Titrington, 56, chief of the construction engineering branch at the National Institutes of Health and a retired captain in the Navy Reserves, and his wife, Susanne Hill Titrington, 54, who was active in service and political organizations, were killed Feb. 6 in a traffic accident in Gaithersburg. They lived in Laytonsville.

Montgomery County police said the car driven by Mr. Titrington was struck by a truck at Goshen and Warfield roads.

Mr. Titrington was a native of Alexandria and a graduate of Montgomery Blair High School. He served with the Marine Corps in the Pacific during World War II. He earned a degree in civil engineering at George Washington University in 1950. He joined the Navy Reserves that year and retired in 1980. He had worked for the Portland Cement Association before joining NIH in 1964.

He was a member of the American Society of Civil Engineers and was active in the Boy Scouts, the Masons and St. Anne's Episcopal Church in Damascus and St. Bartholomew's Episcopal Church in Laytonsville.

Mrs. Titrington was a native of Washington and a graduate of Bethesda-Chevy Chase High School. She attended George Washington University, where she and her husband met, and Montgomery College.

She was a volunteer in the Republican Party and was a past president of the Herbert Hoover Women's Republican Club. She also took part in numerous other GOP activities.

In addition, she was a past president of the Gaithersburg-Washington Grove Garden Club and was a volunteer with Planned Parenthood, the Head Start program, Montgomery General Hospital, St. Bartholomew's Episcopal Church and St. Anne's Episcopal Church.

Mr. and Mrs. Titrington's survivors include two daughters, Susan T. Wahle and Rosemary T. Simonsen, both of Fairfax; two sons, John G., of Southport, N.C., and James P., of Lake Villa, Ill.; four grandchildren; his two sisters, Nancy Tucker of Sandy Spring, and Natalie Quinn of Pennock, Md.; her mother, Mildred M. Hill of Laytonsville, and her sister, Gretchen H. Fowler of Rockville.