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Institute for Aviation Military Technology HL-1 / HL-2
 The Ministry of Defense and the High Command of Vietnamese Air Force assigned the Institute for Aviation Military Technology to manufacture the HL-1 trainer in January 1981.
The HL-1 was designed based on the Pilatus P3 of Switzerland, Zlin 526 of former Czechoslovakia and Yak 18 of the former USSR.  HL-2 was the second prototype.
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