FC3 just contains campaigns for the aircraft that come with it.
MiG-29, SU-27, SU-33, SU-25, F-15, and the A-10
There are probably some KA-50 missions and campaigns in the downloads section here:
https://www.digitalcombatsimulator.com/en/files/?arrFilter_pf%5Bfiletype%5D=&arrFilter_pf%5Bgameversion%5D=78&arrFilter_pf%5Bfilelang%5D=&arrFilter_pf%5Baircraft%5D=&arrFilter_CREATED_USER_NAME=&set_filter=Filter&set_filter=Y
Hope that helps.