Karl E. Yunker, 69, a retired Navy ordnance engineer, died Saturday at Fairfax Hospital after a heart attack.

He came to Washington and began his career with the Navy in 1938.After two years as a draftsman and mechanicl engineer at the Naval Gun Factory, he joined the Navy's Bureau of Ordnance, where he helped design gun mounts and served as a supervisory engineer.

Mr. Yunker transfered to the Bureau of Naval Weapons and worked in the Anti-Submarine Warfare Systems project office. He retired in 1972.

He received a number of awards, including one from Bureau of Ordnance for his participation in the Navy's gun development program, and a 1967 award from the Navy Weapons Engineers and Scientists for his service to that organization.

He was general manager of the Washington Navy Tennis Team from 1948 to 1974, treasurer of the Naval Ordnance Pistol Club from 1950 to 1978, and a member of the McLean Tennis Club.

Following his retirement, he had helped deliver Meals on Whells to area shut-ins, and had given slide lectures at area nursing homes.

Mr. Yunker was born in Indiana and reared in Nebraska. He was a 1931 graduate of the University of Nebraska and worked as a road surveyor in Nebraska and as an engineer in West Virginia before moving here.

He was a member of Trinity United Methodist Church-McLean.

He survived by his wife, Ruth, and a son, Steven, both of the home in McLean; a daughter, Judith Gentry, of Knoxville: a sister, Lillian Olney, of Lincoln, Neb., and two grandchildren.

The family suggests that expressions of sympathy be in the form of contributions to the Heart Fund. CAPTION: Picture, KARL E. YUNKER