John C. Frasca, 52, chief of the power engineering branch of the Voice of America, died Saturday at Commonwealth Doctors Hospital in Fairfax after a brief illnes.

He was a mechanical engineer and directed the design, development, modernization and maintenance of the VOA broadcasting facilities.

He joined the VOA in 1961, and became head of the power engineering branch in Washington in 1966.

Borin in Islip, N.Y., he was a graduate of the Polytechnic Institute of Brooklyn and the U.S. Merchant Marine AScademy. He also served in the Navy from 1948 to 1951.

He was employed as a marine and mechanical engineer in New York City during the early 1950s, and then came here to work for the Navy Bureau of Ships and Bureau of Aeronautics.

He was a member of Joly Spirit Church in Annandale, and Alpha Chi Rho fraternity.

He is survived by his wife, Margaret, of the home in Burke; three sons, John Charles Jr. of Minneapolis, William Joseph, of Gardner, Kan., and Robert Allen, of the U.S Air Force; two daughters, Laurel Ann, of the home, and Janet L. Swint, of Ft. Devins, Mass., and his parents, Mr. and Mrs. Joseph Frasca, of Fairfax.