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The C 24 was originally supposed to participate in the German Air Race under the command of Lt. Hans Jeschonnek, but in fact, Dipl.-Ing. Albrecht Spieß flew the aircraft in the competition. Unfortunately, the D-675 only managed just under a third of the prescribed total distance and thus ranked among the "also-rans" in the overall standings. This was due to two reasons: Firstly, for unknown reasons, the aircraft only made it as far as Bremen in the first round of the air race (May 31 - June 1), so pilot Spieß – together with his Caspar colleague Sido in the C 26 D-674 – decided to immediately move on to the second round on June 2, which, however, meant he was missing several kilometers of the first and second rounds in the final tally. Even more serious, however, was the fact that the D-675 had to be withdrawn for good during the third circuit because it was forced to make an emergency landing near Großrinderfeld (24 km southwest of Würzburg) shortly after takeoff on June 4th and was severely damaged in the process. Spieß was lucky; he remained unharmed. The battered airframe was transported back to Travemünde by railcar. At the Caspar factory, the aircraft was repaired and simultaneously rebuilt according to the instructions of the DVL (German Aviation Association): The control cables were rerouted, the engine mount was modified, the struts were reinforced, the bracing was improved, and dual controls were installed. On August 17, 1925, the first test flight took place, and after a few minor modifications, the aircraft flew to Berlin-Adlershof on August 28 to be accepted by the DVL. At the beginning of September 1925, the D-675 was sold to the Chemnitz Aviation and Aircraft Association and transferred to Chemnitz. Under pilot Erich Lehmann, the aircraft immediately participated in the 1925 Saxony Flight Competition, which took place on September 19 and 20 and had Chemnitz as its start and finish point. The C 24's luck was not on its side in this competition either: On September 19... Pilot Lehmann had to make an emergency landing in Burkau (west of Bautzen) due to oily spark plugs and spend the night there. The following day, the D-675 continued its cross-country flight but did not reach the finish line because it had to make another emergency landing due to a broken rocker arm. Since the necessary spare part could not be found in time, the aircraft was eliminated from the competition and finished in the "also-rans" in the final standings.