On 25 April 1936, the Potez 630-01, equipped with a pair of 580 hp Hispano-Suiza 14, conducted its maiden flight from Méaulte, Picardy. Initially, the prototype was equipped with an experimental feature in the form of a braced horizontal stabilizer that incorporated no dihedreal. On 6 May 1936, the prototype suffered some damage due to a hard landing following the mid-air loss of a propeller blade. On 3 August 1936, after receiving repairs, the Potez 630-01 was transferred to Villacoublay Air Base, Île-de-France; it was soon refitted with an alternative tail arrangement similar to later production aircraft and long-stroke landing gear. On 20 November 1936, flight testing of the prototype resumed; it was shortly thereafter delivered to the "Centre d'Essais de Matériels Aériens" (CEMA) for official tests.