This is what I mean the controversy
According to AVIC's records
October 14th, 1966 the replication task of An 24 was offically named by project Y-7
and the work was given to AVIC Hongdu (now known for manufacturing K-8 and JL-10)
by that time Hongdu was attempting to replicate the IL 14M and failing to improve and enlarge its size（AKA abandoned project Y-6）
March 1968 all design drawings, technical conditions, and process equipment design drawings and process specifications have been finally determined and Preparing to manufacture the prototype
October 25, 1968 All Y-7 projects taken over by XAC（unkonwn reason but clearly caused by politics ）
December 25, 1970 Two weeks after the first aircraft was assembled, Y-7 successfully took its maiden flight
It is obvious that if the information provided by AVIC is reliable, the overall system progress of Z-6 is faster than the AN-24 replication project
and WZ5 has a factory code of 792, and this engine first appeared in the preliminary engineering demonstration of Z-6 as an available power in August 1966
The timeline highly overlaps, but is not completely consistent and belongs to different factorys
that's all i found
i am also curious about the history of this turboshaft engine which made by AVIC Harbin 120 factory
According to AVIC's China Aviation News
Z-6 shares 43% element parts with Z-5/Mi-4 and 26% finished products
spec under
View attachment 122679
Finally, it seems that the authorities do not care at all about the preciousness of these histories
bit disgusting
