Advanced Trainer – same as BC-1A with minor changes, powered by a 600hp R-1340-47 and armed with forward-firing 0.3in machine gun, nine original started as BC-1As and 85 built.
Same as AT-6 but with 600hp R-1340-49 and removable wing centre section fuel tanks, 1847 built with 298 transferred to the United States Navy as the SNJ-3. Survivors re-designated T-6A in 1948.
Same as AT-6A but with 600hp R-1340-AN-1 and dorsal gun fitted as standard, 400 built.
Same as AT-6B but with material changes to low-alloy steel and plywood, 2970 built including transfers to the United Kingdom as the Harvard III.
Same as AT-6B but with a 24V DC electrical system, 4388 built including transfers to the United States Navy as the SNJ-5 and to the United Kingdom as the Harvard IIA. Redesignated T-6D in 1948.
One AT-6D re-engined with a 575hp V-770-9 V-12 inline engine for trials.
Same as AT-6D but with a strengthened airframe and minor modifications, 956 built including transfers to the United States Navy as the SNJ-6, Redesignated T-6F in 1948. Clear fixed rear canopy. Some went to Russia via Lend-Lease.
Noorduyn built lend-lease Harvards, 1800 built
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