The Navy requested further development in order to bring the aircraft into the category of patrol bomber, and in October 1935, the prototype was returned to Consolidated for further work, including installation of 900 hp (670 kW) R-1830-64 engines.
Flåden forlangte yderligere udvikling for at få flyet ind i kategorien patrulje bomber, og i Oktober 1935 fik Consolidated prototypen retur for at udføre ændringer, blandt andet installation af 900 hp (670 kW) R-1830-64 motorer.