as MP-6-2M17 if floats were attached. Variants ANT-7The OKB designation of the project and prototype, powered by two BMW VI V-12 engines. R-6(R – Razvyedchik – reconnaissance) reconnaissance version, powered by two Mikulin M-17F V-12 engines. first flight 1929, trials 1930. KR-6(KR – Kreiser Razvyedchik – cruiser reconnaissance) escort fighter version 1934, powered by two Mikulin M-17 V-12 engines, fitted with two PV-2 machine guns and a second gunner. KR-6PAlternative designation of the MR-6 floatplane version. MP-6 2M-17(Morskoj Paassazhirskii – seaplane passenger transport) Civil floatplane version, powered by two Mikulin M-17 V-12 engines.. PS-7 2M-17(Paassazhirskii – passenger transport) Civil transport version PS-7 2M-17, cargo and passenger transport, first versions open cockpit, one version enclosed. MR-6(Morskoj razvyedchik – maritime reconnaissance) R-6, torpedo bomber version, 1932. P-6(Paassazhirskii – passenger transport) Civil cargo and passenger transport version. R-6 LimuzinNine-seat civil transport version with a closed cockpit and a seven-seat cabin with glass windows and a luggage compartment. Powered by two BMW VI V-12 engines. First flown in July 1933, the sole R-6L crashed on 5 September 1933 as a result of a maintenance error. ANT-18Ground attack version with two Mikulin M-34 engines, armor protection, and two dorsally-mounted machine guns. Operators Military operators Soviet Air Force Soviet Naval Aviation Civil operators Aeroflot Avia Arktika Accidents and incidents June 23, 1941: A Dalstroi Aviation PS-7 crashed on takeoff from Chokurdakh after the left float struck a submerged log; all five on board survived, but the aircraft was written off. October 19, 1943: A Dalstroi Aviation PS-7 crashed on takeoff from Zyryanka owing to improper luggage loading caused by crew error; all 12 on board survived, but the aircraft was written off. Specifications (R-6) See also References Bibliography Duffy, Paul & Kandalov, Andrei. (1996) Tupolev, The Man and His Aircraft. Warrendale, Pennsylvania: Society of Automotive Engineers. 1920s Soviet and Russian military reconnaissance aircraft ANT-07 World War II Soviet reconnaissance aircraft Aircraft first flown in 1929 Twin piston-engined tractor aircraft