Delbert H. Flint Sr., 66, who retired last year as director of personnel for the Federal Communications Commission, died Friday at Arlington Hospital after a heart attack.

In 1953, Mr. Flint joined the FCC as chief of the manpower utilization and survey section, which then included the personnel and management divisions. He became director of personnel about a year later, when the two divisions were separated.

Following World War II, he was a civilian employe of the Department of the Army. He was deputy chief of personnel in the office of the Chief Chemical Officer before joining the FCC.

During the war, Mr. Flint served as a training officer for the Army Chemical Warfare Service. He also worked in the Office of the Chief of Chemical Warfare in Washington.He was a retired lieutenant colonel in the Army Reserves.

Mr. Flint organized and conducted executive development programs for the Society for Personnel Administration and was a former chairman of the Regulatory and Independent Agency Personnel Group in Washington.

A native of Salem, W. Va., he earned a bachelor's degree with high honors in social sciences from Salem College there.

In the late 1960s, as chairman of an Arlington School Board Advisory Committee, he was instrumental in the successful passage of a $16 million school bond issue.

Survivors include his wife, Mary Huger Flint of the home in Arlington; a son, Delbert H. Jr., of Fairfax County; two daughters, Karen, of Washington, and Deborah F. Reid of Gaithersburg; a sister, Mildred F. Meinecke of Sun City, Ariz., and a brother, Howard L., of Salem.