North American AT-6/SNJ Texan/Harvard - version overview
Fixed undercarriage variants here.
NA-26 - prototype, NA-16 variant with retractable landing gear
NA-44 - prototype with semi-scooped fuselage and retractable landing gear, sold to Canada
NA-45 (NA-16-1GV) - export equivalent of BC-1 for Venezuela, 3 pcs
NA-48 (NA-16-3C) - NA-45 counterpart for China, 15 units
BC-1 - serial variant of the NA-26, 177 units; to enable their purchase despite a reduced training budget, they were designated as "basic combat"
BC-1-I - 30 machines modified for instrument flight training
BC-1A - serial variant of the BC-2, 83 units
BC-2 - the last three BC-1s delivered with a semi-scooped fuselage and other modifications as per NA-44, three-bladed propeller
AT-6 - second series BC-1A, practically differing only in details, 94 pieces
AT-6A - modified cockpit, unified version for USAAC and US Navy, 1847 units
AT-6B - variant for gunnery training, third machine gun in the wing and bomb racks, 1400 pcs.
AT-6C - similar to AT-6B, most with plywood and wood parts instead of aluminum, 2222 pcs
AT-6D - similar to AT-6C with 24V wiring, only about 440 used wooden parts; 3958 pcs.
ET-6D - at least one AT-6D used for various experimental purposes
XAT-6E - prototype with Ranger V-770-9 inline engine
AT-6F - removed ability to carry movable machine gun and bomb racks, fixed rear section of cockpit overlay, ability to carry additional tanks; 956 units
ET-6FET-6F - one machine modified for landing gear tests for crosswind landings
T-6G - conversion of the older AT-6/SNJ with simplified cabin framing, removal of the ability to carry armament, new radios and modified hydraulics and auxiliary tanks in the outer wing panels; 2,068 units
FT-6G - prototype conversion to a ground support machine, with the ability to suspend two machine gun and rocket cases or four bombs under the wings and a 189 l auxiliary tank under the fuselage
LT-6G "Mosquito" - T-6G converted for forward air guidance, with the ability to carry a machine gun case and six tracer rockets under each wing; 97 units
T-6HT-6H - short-lived designation for the T-6G from the conversion line at Columbus; elsewhere reported to be a converted AT-6F, probably true of both together
T-6J T-6J - designation for new-build machines matching the T-6G, order cancelled before production began and rights sold to Canada; designation probably erroneously used for 285 Harvard Mk.4 paid for by USAF, but not documented on their identification cards
AT-16 - USAAF "accounting" designation for the AT-6A produced under license by Noorduyn (Harvard Mk.IIB)
SNJ-1 - a variant of the BC-1 for the US Navy with a semi-scooped fuselage, 16 pieces
SNJ-2 - similar to SNJ-1 with different engine, 61 pcs
SNJ-3 - designation for the US Navy AT-6A
SNJ-3C - 55 machines modified for carrier landing training
SNJ-4 - 2,400 AT-6Cs for the US Navy
SNJ-4C - 85 SNJ-4s modified for carrier landing training
SNJ-5 - 1987 AT-6D for US Navy
SNJ-5C - unknown number of SNJ-5s modified for carrier landing training
SNJ-6 - 411 AT-6Fs delivered to the US Navy
SNJ-7 - converted T-6G equivalent machines, 6 units, two for gunnery training as -7B and three for deck training as -7C; other conversions cancelled in favor of SNJ-8
SNJ-8 - designation for new-build machines equivalent to SNJ-6, order cancelled before production started
Harvard Mk.I - export variant of BC-1 for RAF and Canada, 400 as NA-49 and 30 as NA-61
Harvard Mk.II - export variant BC-1A for RAF and Canada, 1275 units including 450 originally ordered by France as NA-76
Harvard Mk.IIA - 747 AT-6Cs bought by Britain
Harvard Mk.IIB - AT-6A produced under licence by Noorduyn, 2557 units
Harvard Mk.III - 537 AT-6Ds bought by Britain
Harvard Mk.4 - similar to the T-6G built by Canadian Car & Foundry, 555 units