A stall occurs when a vehicle dependant on wings fails to achieve the requisite lift . This happens when the vehicle does not move at least 5 squares horizontally in a round. Jets and propellers stop functioning, and the vehicle must attempt to glide. To pull out of a stall, the pilot must succeed in a DC 8 pilot check as a 4SA. The DC decreases by 1 point every round after the vehicle begins to stall.