Edward T. Henthorn, 58, a civilian mechanical engineer in the office of the Army's deputy chief of staff for logistics and an area resident since 1963, died Thursday at Arlington Hospital after a heart attack.

Mr. Henthorn came to Washington as an aeronautical engineer with the D.C. National Guard. About a year later, he joined the Army Material Command.

He joined the office of the deputy chief of staff in 1971. Since that time he had worked as a mechanical engineer in programs that upgraded the Army's tanks and in the design and production of the Army's new main battle tank.

Mr. Henthorn was a native of New York City and a 1950 graduate of Bradley University in Peoria, Ill., where he earned a bachelor's degree in mechanical engineering. He worked for the New Jersey Army National Guard before coming here.

He was an Army officer in Europe during World War II. He returned to active duty during the Korean conflict and commanded an Army helicopter squadron in Korea. He retired from active duty as a captain after that conflict, but remained in the Army reserves until retiring as a lieutenant colonel in 1967.

Mr. Henthorn was a resident of Arlington and a member of St. Peter's Episcopal Church there.

Survivors include his wife of 31 years, the former Marguerite Famy, of Arlington; three sons, Edward Robert, of Manassas, and Harold Arthur and Robert Thomas Henthorn, both of Arlington.