Basic Trainer with 400hp Wright R-975-7 Whirlwind and new canopy. Dangerous stall resulted in a variety of unsuccessful fixes. 42 built.
Armed BT-9 with one cowl gun and one rear flexible gun, and modified canopy. 40 built.
Minor changes from BT-9, unarmed. 117 built. 1 modified as sole BT-9D which was modified as a prototype for BT-14 with new outer wing panels and other alterations.
Wright R-975-7, similar to the BT-9A with minor changes. 66 built
One prototype only, Intermediate step in development of the BT-14.
600hp Pratt & Whitney R-1340-41. First aircraft of batch of BT-9C completed as Y1BT-10.
Production version of Y1BT-10 – cancelled
lengthened all metal fuselage and new canopy, Pratt & Whitney R-985-25, 251 built.
27 BT-14s were re-engined with 400 hp (298 kW) Pratt & Whitney R-985-11.
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