MC21全復材主翼是和奧地利FACC合研的，FACC是中航集團公司的全資控股公司。C919的全復材主翼會在其第二發展階段中實現。

Russia’s United Aircraft Corp. (UAC)  subsidiary Aerocomposit has developed the carbon-fiber wing for the MS-21 in cooperation with FACC and Diamond Aircraft, another Austrian company. That wing completed fatigue testing at the government aeronautical engineering institute TsAGI near Moscow last spring. 

The MS-21 wing has since been sent to TsAGI for static testing. Program managers for the widebody are looking at their options in acquiring tooling that needs to be ordered early, says an industry official in the U.S. Their requirements are consistent with the large-scale use of composites that Slyusar describes.

Comac considered developing a composite wing for the C919, but ultimately decided against it because Comac want to put C919 into the market the sooner. It is proposed that the carbon-fiber wing for the C919 will come out in the phase II development of C919. Avic, Comac’s airframe supplier, owns Austrian composites specialist FACC.