The F.K.50 was a cantilever high-wing cabin monoplane with a fixed wide track tailwheel landing gear.

It was powered by two Pratt & Whitney Wasp Junior T1B engines and had a conventional single fin and rudder.

The first was a straight conversion of the F.K.50; the second would have been powered by 830 horsepower (620 kW) Bristol Mercury VIS radial engines.

[1] The three aircraft operated a regular service between Swiss destinations and onwards to Lyons and Marseilles and charter flights to Paris and London.

[1] The second to be built, the aircraft crashed on landing 25 kilometers from Basle Airport on 10 September 1937 with the loss of three lives.