A development of the AIR-2 in parasol monoplane configuration, it used an identical fuselage, powerplant, landing gear and tail. Finance for construction was provided by Osoaviakhim. The aircraft was ready in the Summer of 1929 and on September 6 pilots Filin and Kovalkov (at the time students of the VVA, as well as a designer), flew nonstop from Mineralnye Vody to Moscow covering 1835km with average speed 166.8km/h, setting another International Record for Yakolev's aircraft.
Engine: 1 x Walter, 44kW Max take-off weight: 762 kg / 1680 lb Empty weight: 392 kg / 864 lb Wingspan: 11.0 m / 36 ft 1 in Length: 7.1 m / 23 ft 4 in Height: 2.4 m / 8 ft 10 in Wing area: 16.5 sq.m / 177.60 sq ft Max. speed: 146 km/h / 91 mph Cruise speed: 125 km/h / 78 mph Ceiling: 4200 m / 13800 ft Crew: 2