Sven E. Johnson, 81, a veteran of both World Wars and the Korean conflict and was a civilian government employee for more than 20 years, died of a heart ailment Monday at Bethesda Naval Hospital.

Mr. Johnson came to this country from Sweden in 1914. While mastering English he worked for a number of families in the New York area as an auto mechanic, handyman and servant.

He began to work for the family of former President Theodore Roosevelt in 1917, and became a close friend of Roosevelt's son, Quentin.

He joined the Army's flying school detachment, and trained to become a bombardier. He was assigned to the plabe to be flown by Quentin Roosevelt. However, Mr. Johnson came down with flu before his unit left for France. uentin Roosevelt was shot down on his first mission and died.

After the war, Mr. Johnson enlisted in the Navy and served with the Fleet Reserve until he reitred with the ranck of lieutenant commander in 1952.

During World War 11 and the Korean conflict he was called to active duty and served aboard aircraft carriers as a warrant officer, supervising the work of airplane mechanics.

He was a building superintendant at the Federal Reserve Board for more then 20 years and retired in 1961.

Mr. Johnson had moved to this area in 1937.

He was a member of St. Camillus Catholic Church in Silver Spring.

He is survived by his wife, Edna Steed Johnson, of the home in Hyattsville; two sons, Paul B. and William V., both of Washington: a brother, Hjalmar, of Sherman, Tex., and a brother and two sisters in Malmo, Sweden.