Like other early Italian monoplanes, the C.200 suffered from a dangerous tendency to go into a spin. Early production C.200 aircraft showed autorotation problems similar to those found in the Fiat G.50 Freccia, IMAM Ro.51, and the AUT 18. At the beginning of 1940, a pair of deadly accidents occurred due to autorotation. Both deliveries and production were halted while the "Regia Aeronautica" evaluated the potential for abandoning use of the type, as the skill involved in flying the C.200 was considered to be beyond that of the average pilot. The problem was a product of the profile of the wing. Castoldi soon tested a new profile, but a solution to the autorotation problem was found by Sergio Stefanutti, chief designer of SAI Ambrosini in Passignano sul Trasimeno, based on studies conducted by German aircraft engineer Willy Messerschmitt and the American National Advisory Committee for Aeronautics (NACA). He redesigned the wing section according to variable (instead of constant) profile, which was achieved by covering parts of the wings with plywood.