From Austro-Hungarian Army Aircraft of World War 1 (Haddow, Scheimer)
Aviatik D.I Series 338 Aircraft have an interesting story.
"By the middle of 1918, output of the new 225 hp Daimler engine had reached a level sufficient to supply two production fighters, the Albatros D.III(Oef) series 253 and the Aviatik D.I series 338. Contracts for a total of 294 Aviatik D.I fighters powered by the 225 hp engine were awarded to Aviatik, Lohner, Lloyd and WKF. These aircraft had strengthened wings and engine bearers, and were armed with twin guns mounted at eye level.
As part of the contract dated 18 May 1918, Aviatik built a pre-production batch of eight D.I series 338 fighters for evaluation. These were numbered 338.01 to 338.08. Shortly thereafter, Flars ordered 100 production fighters numbered 338.21 to 338.120 (numbers 338.09 to 338.20 remained unused). The pre-production machines arrived at Aspern in June-July 1918 for flight trials. Engine cooling posed a vexing problem. The nose radiator originally fitted to aircraft 338.01 was replaced by twin Hefa side radiators to improve cooling efficiency and forward visibility. Various other side radiators and an Oefam airfoil radiator (tested in aircraft 338.07) were rejected in favor of a block radiator mounted on the upper wing leading edge which became the production standard.
Two fighters, 338.03 and 338.04, participated in the Fighter Evaluation held on 9-13 July at Aspern. The climb trials performed with aircraft 338.03 were interrupted when the side radiators began to boil over at altitude, but enough data was obtained to demonstrate a remarkable climb rate, second to none. Tested against a captured Sopwith Camel, aircraft 338.06 was faster and showed equal maneuverability with ability to perform sharp turns without altitude loss. In August 1918, aircraft 338.01 and 338.02 were dispatched to Flik 1/J at Igalo for service trials. Here take-off for interception occurred only after enemy aircraft were positively reported or visually sighted. Since it was a task suitable "only for the most rapid climbing and fastest fighter," the fast-climbing D.I series 338 was the ideal aircraft. Flik 1/J commander Oberleutnant
Bela Macourek and Offizierstellvertreter
Julius Arigi were both credited with two victories while flying a series 338 fighter. Production fighters began to reach the Front in September 1918, but only very few saw combat service in the waning days of the war.
After the crash of aircraft 338.89 which killed Aviatik test pilot Feldwebel Franz Tordik on 16 October 1918, investigation discovered a faulty aileron-pulley support. On 29 October appropriate modifications were ordered on the 34 completed fighters: 338.01 to 338.08, 338.21 to 338.35 and 338.86 to 338.96 and those in production. The reasons for the non-consecutive production run is not known. At the war's end, the resident inspection officer accepted 27 completed series 338 fighters at the factory; the remaining 23 were almost complete. Series 338 production was scheduled to end in December 1918.
Postwar plans calling for the Aviatik D.I series 338 to equip the Austrian air arm were forbidden by the treaty stipulations. Acceding to Czechoslovakian demands, 24 series 338 fighters and ancillary equipment were loaded on freight cars for shipment in December 1918. But the Austrian demobilization office did not grant an export permit until mid-January 1919. By then the fighters, damaged by weather exposure and theft, had only scrap value."