This milestone represents the first flight of the 3rd prototype  of the re-launched Yan-An 2 helicopter program. The aircraft was a two-seat light helicopter, the Yan'an-2 fuselage was a semi-monocoque pod-and-boom construction on tricycle landing gear.

 Source: Chinese Aircraft: China's Aviation Industry since 1951, Yefim Gordon and Dmitry Kommissarov, Published by Hikoki Publications Ltd, 2008, Page 269