I had this problem and this is what i did to fix it:
1) Go to Options -> Controls -> Ka-50 III
2) Right click each n every column (Ex: Keyboard, Your Controllers, Mouse...) and click "Clear Combo"
3) Remember, do that for ALL the controllers + keyboard & mouse...
4) Click OK n exit the game!
5) Log back in/open the game again...
6) Right click each n every column (Ex: Keyboard, Your Controllers, Mouse...) and click "Reset Combo to Default"
7) Exit the game again...
8 ) Log back in/open the game... GG, it works now...
PS: youll need to set the Axis again...fine tune em!