I usually start any mission from the ramp with cold engine, however i cannot get any of the cannons to operate at all if starting from the ground. And when i start any mission from mid-air the guns ready lights are already on and the only thing needed is to flip the safety cover. The power switch to the guns is on, ammo in the boxes and all three are reloaded. No difference between hot or cold start on the ramp or runway. Any ideas?