2 June 1941. P-10 1941 advanced bomber trainer with modified fuselage, sliding canopy and Jacobs engines, one built. USAAC/USAAF designations AT-8 Military advanced trainer with two Lycoming R-680-9 radial piston engines, 33 built. AT-17 As per AT-8 but powered by Jacobs R-755-9 (L-4) engines, 450 built, some later converted to AT-17E. AT-17A As per AT-17 but with metal propellers and reduced weight, 223 built. 182 to Canada as Crane Mk.IAs and later conversions to AT-17Fs. AT-17B As per AT-17A but with equipment changes, wooden propellers and reduced weight, 466 built. Subsequent aircraft were built as UC-78Bs. AT-17C As per AT-17A but different radio equipment, 60 built. AT-17D As per AT-C with equipment changes, 131 built. AT-17E AT-17 with gross weight limited to . AT-17F AT-17A with gross weight limited to . AT-17G AT-17B with gross weight limited to . C-78 Transport with variable-pitch propellers, became UC-78 in 1943, 1354 built. UC-78 C-78 redesignated in 1943 UC-78A 17 civilian T-50s impressed. UC-78B AT-17B redesignated, 1806 built. UC-78C AT-17D redesignated, 131 AT-17Ds redesignated and 196 built. USN designation JRC-1 Navy light transport version of the UC-78 with two Jacobs -9 engines, 67 delivered. RCAF designations Crane Mk.I 640 T-50s with minor equipment changes. Crane Mk.IA 182 AT-17As delivered to RCAF under lend-lease. Operators Brazilian Air Force (operated 39 from 1943 to 1956) Royal Canadian Air Force (operated 822 from 1941 to 1949) No. 3 Service Flying Training School RCAF (SFTS) — Calgary, Alberta No. 4 SFTS — RCAF Station Saskatoon No. 10 SFTS — RCAF Station Dauphin No. 11 SFTS — RCAF Station Yorkton No. 12 SFTS — RCAF Station Brandon No. 15 SFTS — RCAF Station Claresholm No. 1 Flying Instructor School — RCAF Station Trenton No. 2 Flying Instructor School — RCAF Station Vulcan/RCAF Station Pearce No. 3 Flying Instructor School — RCAF Station Arnprior Central Flying School — RCAF Station Trenton Queen Charlotte Airlines Air Force of Costa Rica (operated one in 1948) Ethiopian Air Force (operated two from 1946 to 1965) French Air Force and French Navy (operated eight from 1943 to 1951) Guatemalan Air Force (received one in 1949) Haiti Air Corps (operated four from 1943 to 1995) Nicaraguan Air Force (received two in 1947) Yemeni Air Force (operated three from 1950 to 1958) Republic of China Air Force (operated 15 from 1946 to 1950) Peruvian Air Force (operated nine from 1945 to 1958) LOT Polish Airlines