The later model JN-4H was developed for training of pilots. To develop the JN-4H, a JN-4D was modified to accommodate a 150 hp Hispano-Suiza engine, built by the Wright company, and the radiator area and fuel capacity were increased. In total 929 JN-4H planes were built in period 1917 – 1918 years. These planes were equipped with machine guns and bomb racks for advanced training and were assigned to various specialized training of bombing groups, fighting groups, reconnaissance and aerial gunnery units.