It was to be armed with three 30 mm (1.2 in) cannon with 75 rounds per gun and was to be capable of carrying air-to-ground rockets as well as 200 kg (440 lb) of bombs.

Its fully loaded weight was to be 4,850 kg (10,690 lb) and it was to be ready to be submitted for State acceptance trials in March 1955.

[1] The prototype was completed in December 1954 and it passed all the necessary ground tests by 10 February 1955 when it was cleared to begin flight trials.

However, the Ministerstvo Aviatsionnoy Promyshlennosti (Ministry of Aviation Industry (MAP)) denied Yakovlev authorization to begin flight tests as it favored competing designs from Sukhoi and Mikoyan-Gurevich.

[1] Data from Gordon, et al., OKB Yakovlev: A History of the Design Bureau and its AircraftGeneral characteristics Performance Armament