A last-ditch effort by the networks has staved off an impending loss before the Federal Communications Commission. The FCC was ready to give the film industry a victory on Mar. 14 by voting to continue restrictions on network ownership of shows produced for broadcast. But on Mar. 13, the Justice Dept., after heavy network lobbying, requested that the FCC postpone the decision indefinitely. Antitrust Div. Chief James F. Rill asked the commission to hold off on the vote pending a review of the anticompetitive implications of the proposed rule change.