Forrest Andrews, 89, a mechanical engineer who retired from the Smithsonian Institution in 2012, died of cardiac arrest March 9 at the ManorCare Health Services facility in Potomac. He lived in Bethesda.

His daughter Agatha Andrews confirmed his death.

Forrest West Armistead Andrews was born in Knoxville, Tenn. During World War II, he was an Army radio operator in the Pacific.

He attended Vanderbilt University, the University of Tennessee and George Washington University, from which he graduated in 1957.

He began his career as a mechanical engineer with the Navy’s Bureau of Ships in 1952. Later, he worked for the General Services Administration and for the Syska & Hennessy Engineers in Washington. He began working in 1982 with the Smithsonian, where his duties included attending to the heating and air-conditioning systems of museum buildings.

Mr. Andrews was a member of St. John’s Episcopal Church, Norwood Parish, in Chevy Chase, where he taught Sunday school, served on the vestry and created and performed a children’s puppet show.

His wife of 44 years, Ruth Kaye Andrews, died in 1999.

Survivors include three daughters, Carolyn Hejkal of Ann Arbor, Mich., Agatha Andrews of Philadelphia and Julia Andrews of Chevy Chase; and four grandchildren.

— Bart Barnes