Jack Lane Eubanks, 61, a retired Navy commander who later worked for a number of engineering and consulting firms in the Washington area, died of cardiac arrest Sunday at Fairfax Hospital. He lived in Alexandria.

Cmdr. Eubanks was born in Kelly, La., and graduated from Louisiana Tech in 1939. He began his naval career in 1941. During World War j II, he served on service ships in the Atlantic and in submarines in the Pacific.

His post-war assignments included command of the destroyer Leary in the Mediterranean from 1958 to 19598 during which time the ship won a number of outstanding efficiency reports. From 1959 until his retirement in 1964, Cmdr. Eubanks was on the staff of the Chief of Naval Operations in Washington and then on the staff of the Joint Chief of Staff.

From 1964 until 1970, he was manager of the engineering design division of the Stanwick Corporation. Subsequently he worked for a number of other engineering firms. At the time of his death, he was employed by the H.B.H. Corporation to work on a consulting contract with the Saudi Arabian navy.

Cmdr. Eubanks was a member of the Army Navy Country Club, the Retired Officers Association and the Belle View Baptist Church in Alexandria.

Survivors include his wife, Alice R. of Alexandria; six daughters, Jacqueline Eubanks of San Francisco, Sahron McCarty of Westminister, Md., Alice Jones of Fairfax, Patricia Eubanks of Monterey, Calif., Jane Trowbridge of Richmond, and Barbara Eubanks of Alexandria; one son, John, also of Alexandria, and two grandchildren