Сразу прошу извинить, что на английском. Ну очень лень переводить

Вы уж сами как-нибудь, ОК?
Это - выдержка из главы нового справочника "Soviet Transports 2004"
On the first of March 1971 an agreement was concluded in Warsaw between Soviet and Polish governments regarding development and production of new aviation 'products' including agricultural aircraft, light helicopters and sailplanes. The USSR had not manufactured any specialised agricultural aircraft after transfer of An-2 production to Poland excepting a small number of An-2Ms. As a consequence, the development of the M-15 was authorised together with associated agricultural and ground-support equipment. The Soviet government indicated a requirement for 3000 aircraft and an agreement was signed on 2nd December 1971 for large-scale production.
Design of the M-15 was undertaken at PZL-Mielec by Soviet consulting engineer R.A.Ismailov and Polish designer K.Gocyla. The specialised agricultural equipment was jointly developed by the Aviation Institute in Warsaw and the Soviet Research Institute of Special & Utility Aviation at Krasnodar.
To test power-unit and equipment the Aviation Institute drastically modified an An-2 as LALA-1 (Latajace Laboratorium-1 = Flying Laboratory-1) which first flew on 10th February 1972. The M-15 is unique in configuration being a jet-powered biplane and a mock-up was approved in June 1972. A prototype which used wings and undercarriage from the An-14, was designated LL-M15 (Latajace Laboratorium-M15) and was first flown on 27th May 1973. The full-size mock-up wore the spurious marks CCCP-1972. The first 'real' M-15 was flown on 9th January 1974.
A prototype reported as 1SP01-07 with spurious marks 'SP-1974' was shown at a Polish industrial exhibition in Moscow in 1974 commemorati…
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