In the summer of 1939 the aircraft factory number 1, built a series of trial-15bis M-25B TC of 10 copies for the passage of military trials.
In the summer of 1939 the aircraft factory number 1, built a series of trial-15bis M-25B TC of 10 copies for the passage of military trials. The sides of the fuselage behind the exhaust nozzle turbocharger these aircraft sheathed steel sheet duralumin casing continued for cockpit