On 15 March 1938, a major re-equipment and expansion program of the French Air Force, known as "Plan V", was approved. While there had been intentions to order a more capable twin-engine aircraft, these were not ready for production, thus the Potez 631 and 633 were retained for this production program, which first involved 207 twin-engined day-and-night fighters along with 449 daytime light bombers. On 25 March 1938, the order for the Potez 633 was increased to 125 bombers, which were also requested to be three-seaters. The Potez 633 orders were subsequently cancelled, ordering additional Potez 631 aircraft in their place; further orders of the Potez 631 were placed to allow for the speedy withdrawal of the troublesome Potez 630. Between January and June 1940, an average production rate of 100 aircraft per month was maintained.