The SCAN 20 was designed to meet a French Air Ministry requirement for a small flying-boat trainer.

The SCAN 20 was a high-wing cantilever monoplane flying-boat with strut-mounted floats under each wing.

It had twin fin with rudders on a raised tailplane and an enclosed cockpit with side-by-side seating for two.

The prototype had a single 425 hp (317 kW) Béarn 6D inline engine strut-mounted above the wing.

An order for 30 aircraft with a more powerful engine was placed for the French Navy but only 23 were delivered.