Arthur E. Eustace Sr., 51, a vice president and director of the Fred S. Gichner Iron Works Inc., died Jan. 15 at Physicians Memorial Hospital in LaPlata, Md., after a heart attack.

Mr. Eustace had worked for the Gichner company since he was 15 years old. He was the third generation of his family to do so, and one of his sons works for it now.

A native of Washington, Mr. Eustace attended the Bell Vocational High School before going to work. He served in the Army in Korea during the war there and then returned to Gichner.

In 1977, he joined the JMB Corp. In 1981, when JMB bought Gichner, he went back to it as shop superintendent. In 1982, he was named vice president of production and a director.

Mr. Eustace, who lived at Cobb Island, Md., was a member of American Legion Post No. 136 in Greenbelt, the College Park Moose Lodge and Local No. 5 of the International Brotherhood of Bridge, Structural and Ornamental Ironworkers.

His marriage to the former Betty Mutter ended in divorce.

Survivors include five children, Arthur E. Jr. of Bowie, Keith L. of College Park, Pamela E. Kulick of Fredericksburg, and Dorinda L. and Tracey B. Eustace , both of Hyattsville; his mother, Nettie M. Eustace of Cobb Island; a brother, Gober C., of Houston, a sister, Nettie Peterman of Forest Heights, and four grandchildren.