The aircraft was registered with the number CCCP-Л1863 and assigned to the 107th (Baku) aviation detachment of the Azerbaijan territorial administration of the civil air fleet.

At 03:07, the aircraft reported entering the airport's airspace at an altitude of 2,400 meters between cloud layers and requested approach and landing conditions.

In such conditions, the crew had to follow a rectangular route and penetrate the cloud cover, descend to 150 meters, align with a course of 243°, then make the fourth turn and pass the OMP with the IMP, perform a visual approach on course 63° to runway 24 by a left-hand circuit.

[2] From the outset, the crash was noted for its strange nature: performing a visual flight, the aircraft began a strong deviation to the right between the fourth turn and the OMP as if the crew were not in control.

At this time, there was continuous stratiform rain cloud cover at 163 meters, mist, and visibility of up to 4 kilometers, meaning that the weather conditions given the crew's training could not have caused the crash.

[2] When the bodies of the crew members were examined, a round wound 5 centimeters deep with burn marks around the edges was found on the left thigh of the commander, Mandrykin.

However, a more detailed examination of the wreckage revealed five round holes, 10 and 35 millimeters in diameter, located in the skin and partition of the cockpit and the left control panel of the engine management.

[2] The commission decided to conduct an examination to prove that the metallic objects found in the commander's body were a bullet fired from a firearm.

Based on these findings, a petition could be filed with the Ministry of Defense of the USSR to close the military range located in the rectangular approach route area on course 243°, as regular firing drills, both day and night, were held there, creating a clear threat to the safety of aircraft flying over the range.