After delivery to the Regia Aeronautica on 5 November 1940 the fate of the prototype is not known, possibly being transferred to Germany for evaluation, it was also rumoured to have been captured by British forces, but it is more likely that it was destroyed in a raid after its transfer to Orvieto.
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With no production orders forthcoming, despite the prototype being returned to the Umbra factory at Foligno for modifications on 20 February 1940 and a second flight test series from 5 November 1940, no improvement was demonstrated over fighters already in production so the A.U.T.18 was abandoned.
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