It refuses to fire...
The plane is a Polykarpov I-16 (Cannons)
Checked via a fired EH (names are the same in the FDF readme):
Weapon = "FDF_airShVAK2x20"
Muzzle = "FDF_airShVAK2x20"
Mode = "FDF_airShVAK2x20"
Ammo = "FDF_airShVAKammo"
I tried :
plane fire ["FDF_airShVAK2x20"]
Nothing
plane fire ["FDF_airShVAK2x20","FDF_airShVAK2x20"]
Nothing happened
plane fire ["FDF_airShVAK2x20","FDF_airShVAK2x20","FDF_airShVAK2x20"]
Nope
plane fire ["FDF_airShVAK2x20","FDF_airShVAK2x20","FDF_airShVAKammo"]
An errormessage : no entry 'config.ccp/CfgWeapons.FDF__airShVAKammo'
:-\