Peggy Chaconas Ewing, 52, a retired assistant regional director of business affairs of the General Services Administration, died Wednesday at her home in Silver Spring after a long illness.

She had retired in May, 1976, after 31 years with GSA, during which she won recognition for her efforts to assist small and minority businesses in marketing supplies and servies to the federal government.

In the 1960s, the GSA had trouble getting the word out that it wanted to tap the local black business community for supplies and services. It was Mrs. Ewing's responsibility to make known the opportunities with GSA.

She advised potential suppliers on how to bid on contracts, how to get their products into the GSA pipeline and how to get agency procurement officers to use them.

Mrs. Ewing received the Outstanding Woman Award from GSA in 1973, and earlier had been nominated for the Federal Woman of the Year Award. She received citations from President Eisenhower and Ford and numerous commendations from members of Congress and businessmen.

Mrs. Ewing was born in Washington and was a lifelong resident of this area. She was a member of the Eastern Star.

She is survived by her husband, Carlton, a daughter, Kathleen Joy and a son, Carlton III, all of the home, and her father and mother, Mr. and Mrs. Constantine Pakes, two sisters, Stephanie Perry and Catherine Spinelli, and a brother, Basil Chaconas, all of the Washington area.

The family suggests that expressions of sympathy may be in the form of contributions to the Salvation Army or St. Sophia Greek Orthodox Cathedral.