Osoaviakhima

Polikarpov U-2

The crew departed Kazan Airport on a local flight. On short final, at a height of about 30-35 metres, the airplane collided with an Aeroflot Tupolev ANT-9 registered CCCP-L150 that was completing a local test flight. It appears that on final, the Polikarpov was flying above the ANT-9 and cut his track before the collision occurred. The Polikarpov dove into the ground and was destroyed. Both pilots were seriously injured and died two hours later. The Tupolev continued for few seconds before it crashed near the runway, coming to rest broken in two. All 11 occupants were slightly injured.

Polikarpov U-1

The airplane departed Moscow on a local training flight with two pilots on board. En route, the crew encountered engine problems and was able to make an emergency landing near Tushino. Mechanics were called to make a check of the engine but nothing particular was noted and the crew was cleared for takeoff. Nevertheless, the captain took off with a mechanic on board to proceed with in-flight tests. Shortly after takeoff, at a height of about 100-150 metres, the airplane entered an uncontrolled descent and crashed, killing both occupants.