The plane was a further development of
Potez 43 family, tracing its roots from
Potez 36. An airframe changed little from Potez 43, main difference were stronger engines. A prototype
Potez 58 first flew on 7 March 1934. In September 1934 the first serial variant
Potez 580 was flown, powered with 120 hp radial engine Potez 6B. There were built 80 of this variant. An air ambulance variant was also evaluated. There were next built several small-series variants, differing with the last digit in designation. The second variant built in a significant series was
Potez 585 – 108 built. Mixed construction
strutted high-wing
monoplane. Rectangular two-spar wing, with rounded ends, supported with V-shaped spars. Wings were equipped with
slats on 1/3 span. Closed cabin with three seats. Radial engine in front, with a
Townend ring, two-blade propeller. Conventional fixed
landing gear, with a rear skid, wheels in teardrop covers. ==Operational history==