[1] Ordered by the Polish Ministry of Transport as a fast mail-plane, the prototype flew for the first time in September 1933 and was the first P.Z.L.

Several tests made at the Institute of Aviation in 1935–1936 showed that the plane had poor performance and was uneconomical to operate.

27 consisted of a welded steel tube fuselage and tail-unit covered with fabric and a wooden 2-spar wing.

Three 130 hp (97 kW) de Havilland Gipsy Major I engines were fitted, one in the nose and two in strut-mounted nacelles under the high-set wings.

to have a revised wing fitted to alleviate problems with insufficient stiffness and poor lateral stability.