What happened
On August 8, 2011, an An-12AP, registration RA-11125, was operating charter flight LN-9209 as part of a commercial cargo service. The flight was operated by Avis-Amur Airlines and involved a route from Komsomolsk-on-Amur (Khurba) to Keperveyem, with a scheduled refueling stop at Magadan (Sokol). The aircraft was carrying various consumer goods, food products, automotive parts, and medicines, but contained no dangerous goods.
The crew consisted of nine individuals, including a pilot-instructor performing a qualification check on the second pilot, a pilot, a co-pilot, a navigator, a flight engineer, a radio operator, a flight operator, and two specialists performing operational maintenance. Additionally, two passengers were present in the aircraft's escort cabin. Pre-flight preparations and crew readiness checks were completed on August 7-8, 2011, by the senior pilot of the An-12 division of Avis-Amur Airlines.
The investigation
Technical maintenance for the flight was conducted at Komsomolsk-on-Amur between August 7 and August 8, 2011, in accordance with established maintenance protocols. The crew arrived at the airport on August 8, 2011, and successfully passed pre-flight medical examinations between 20:14 and 20:30 local time without any noted issues.