The Chicago-based aerospace firm will provide the materials for low rate initial production of the P-8A Poseidon fleet.
The company will perform 68.3 percent of the work in Seattle and the rest will be in Greenlawn, N.Y.; Baltimore; North Amityville, N.Y.; and McKinney, Texas.
The Pentagon expects work under the firm-fixed-price contract to finish in May 2015.
The Naval Air System Command in Patuxent River, Md. is the contracting activity.
The company is also providing electronic classrooms and a weapons tactics trainer to support low rate initial production of the Poseidon.
The Navy uses the plane for intelligence, surveillance and reconnaissance applications.