Thomas B. Cook, 46, a Montgomery County civic leader and a retired aerospace engineer, died Friday at Holy Cross Hospital in Silver Spring of complications from diabetes.

Mr. Cook was born and reared in Montgomery County and had lived in Wheaton for the last 22 years.

After earning a bachelr's degree in electrical engineering from the University of Maryland in 1956, he worked for the Naval Ordinance Laboratory. In the mid-1960s, he joined the National Aeronautics and Space Administration. He worked at NASA's Goddard Space Flight Center in Greenbelt before loss of sight forced his retirement about 1973.

In 1970, Mr. Cook successfuly ran for a four-year term on the Montgomery County Board of Education on a slate sponsored by a citizens group, PACE (Positive Action for Children's Education).

He headed the education committee of the Allied Civic Group of Montgomery County for six years and was the group's president in 1968.

He was active in PTA groups and served as treasurer of the Council for Better Education. He was a member ofthe Montgomery County Council's financial advisory committee, the Citizens Planning Association, and the Community Action and Rehabilitation and Redevelopment commissions.

In recent years, Mr. Cook was a budget consultant for the Montgomery County government.

He received awards for community service from the Allied Civic Group and the Bethesda-Chevy Chase Chamberof Commerce.

In 1970, he received the Charles C.Stott Award for his analysis of Montgomery County school budgets, and in 1976, received the Montgomery County Federation of Teachers' John Dewey Award "for courageous and outstanding service as a board member, citizen and parent."

Mr. Cook was also honored in 1978, when Wheaton High School dedicated its auditorium to him. All six of his daughters attended or graduated from the school.

Survivors include his wife, Rosemary, and six daughters, Lauretta Anne, Allison Renee, Theresa Michelle and Dianne Susan, all of Wheaton, and Kathleen Marie and Christina Lynne, both of Rockville; his mother, Margaret K. Cook of Silver Spring, and two sisters, Jane C. Mongold of Mount Airy, Md., and Margaret C.Jones of Coral Springs, Fla.

The family suggests that expressions of sympathy be in the form of contributions to the Tom Cook Fund atWheaton High School.