Both were made with a structure of side members in profile and ribs in square section tube covered in painted canvas.

In 1927 the airline company Società Italiana Servizi Aerei (SISA), a company owned by the brothers Callisto and Alberto Cosulich as well as the CRDA, had begun to operate on the route that joined the Italian Trieste with Budapest, capital of the then Kingdom of Hungary.

In anticipation of an increase in demand from the air transport market with the possibility of making new connections to Central and Eastern Europe and in particular the opening of a route capable of connecting Trieste airport - Ronchi dei Legionari or, alternatively, the new Noghere airport, then under construction near the village of Zaule, in Vienna to continue to Budapest.

The project, the first of the CRDA-CANT that was not a seaplane, was supervised by the engineer Raffaele Conflenti, who at that time held the position of chief designer and director of the technical office of the company of Monfalcone, which took experience gained in the creation of the CANT 22 hydro line.

In 1929 a cell was created for static tests but the prototype, serial number NC.136, managed to be registered (I -ABLA) only on 11 July 1932.