 Armament was a single Schwarzlose machine gun, which owing to difficulties in synchronising the Schwarzlose, was fitted in a fairing on the upper wing, firing over the propeller.Despite these handling problems, the aircraft was ordered by Austro-Hungary as the D.I.A total of 122 D.Is were built, with 50 built by Hansa-Brandenburg in Germany - powered by 110 kW (150 hp) Austro-Daimler engines - while a further 72 were built under license by Phönix in Vienna, powered by 138 kW (185 hp) Austro-Daimler engines.