Bloch MB.131 in German Service

Although based on the previous MB.310 design, the Bloch MB.311 was a more modern and aerodynamic design. The first prototype flew on August 12, 1936, followed by a second prototype on May 7, 1937. This second aircraft added a fifth crewman, relocated the dorsal turret, and added a ventral turret.

During 1937 the Société Avions Marcel Bloch became part of the Société Nationale de Constructions Aéronautiques du Sud-Ouest (SNCASO). A total of 141 machines were delivered to the French Air Force (including the reworked MB.131, 132 and 133 prototypes).

The MB.131 fared poorly against the Luftwaffe. Used for unescorted long range reconnaissance missions many were shot down. As a result, starting in October 1939, aside from a few aircraft in the GR I/36 and II/36 units, they were withdrawn from the front line and relegated to training units.

At the Armistice, 53 were inventoried in unoccupied France and in 1942, the Germans captured 21 that were then scrapped. Photos of French operated aircraft can be found here.