The airliner received the registration number CCCP-Л1789 and was transferred to the Main Directorate of Civil Air Fleet under the Council of Ministers of the USSR, which assigned it to the 64th (Vnukovo) aviation squad of the Moscow territorial administration of the civil air fleet.

[1] On 27 October, while operating a passenger flight from Moscow, aircraft L1789 arrived in Novosibirsk, where the crew changed.

In Krasnoyarsk itself, variable upper stratocumulus clouds with a lower limit of 600 to 1,000 meters, occasional snow, northwest wind 6–9 m/s, gusts up to 12 m/s, visibility from 4 to 10 kilometers were expected.

However, at 23:50, the AMS in Krasnoyarsk received data that the wind was northwest and at 2,000 meters reached a speed of 130 km/h, meaning the plane was drifting not to the north but to the south.

This error occurred because trainees were sitting behind the radio direction finders in Krasnoyarsk, as the regular staff of 11 people had been sent to serve in the Soviet Army.

The fact that the previous two Il-12 flights from Irkutsk to Krasnoyarsk veered south of the route and arrived late did not raise concerns.

Then, around 00:02–00:04, the aircraft reported to Krasnoyarsk: approaching, 2,700 meters, fuel 2,600 liters, enough, Novosibirsk will accept me, I will fly over.

The Krasnoyarsk airport command and control center dispatcher then began calling board L1789, but there was no response.

In June 1955, seven months later, a hunter on Mount Sivukha (elevation 1,807 meters, 54°30′25″N 94°41′10″E / 54.50694°N 94.68611°E / 54.50694; 94.68611) and in the upper reaches of the Mana River accidentally discovered the wreckage of the aircraft.

In the summer of 2010, an expedition of 10 people arrived at Mount Sivukha in GAZ off-road vehicles and installed a memorial cross at the crash site.