Incident Overview

Date: Sunday 29 July 2007
Aircraft Type: Antonov An-12BP
Owner/operator: ATRAN-Aviatrans Cargo Airlines
Registration Number: RA-93912
Location: 4 km from Moskva-Domodedovo Airport (DME) – ÿ Russia
Phase of Flight: En route
Status: Destroyed, written off
Casualties: Fatalities: 7 / Occupants: 7
Component Affected: Aircraft Engine (Specifically Engine No. 4 and Engine No. 3)Aircraft Engine (Specifically Engine No. 4 and Engine No. 3)
Investigating Agency: MAKMAK
Category: Accident
Narrative
On October 26, 2023, an An-12 aircraft, registration RA-93912, crashed during a cargo flight from Moscow to Komsomol’sk-on-Amur, resulting in significant damage and destruction. The aircraft was en route to Gagarin Aircraft Manufacturing Association in Komsomolsk-on-Amur (KnAAPO) with intermediate stops at Omsk and Bratsk. The flight commenced at 04:15, and the crew commented on the presence of birds in the area. After takeoff, the aircraft taxied to runway 32C for departure. Approximately six minutes after takeoff, the navigator reported a safe speed and gained 10 meters of height. Subsequently, the aircraft experienced a loss of altitude and airspeed, culminating in a right bank of over 100 degrees, leading to a collision with trees and subsequent burning. Weather conditions at the time of the incident included 1010.2 hPa, a temperature of 14øC, a dewpoint of 13øC, a relative humidity of 94%, a wind speed of 1 m/s, and visibility of 100 m in fog.On October 26, 2023, an An-12 aircraft, registration RA-93912, crashed during a cargo flight from Moscow to Komsomol’sk-on-Amur, resulting in significant damage and destruction. The aircraft was en route to Gagarin Aircraft Manufacturing Association in Komsomolsk-on-Amur (KnAAPO) with intermediate stops at Omsk and Bratsk. The flight commenced at 04:15, and the crew commented on the presence of birds in the area. After takeoff, the aircraft taxied to runway 32C for departure. Approximately six minutes after takeoff, the navigator reported a safe speed and gained 10 meters of height. Subsequently, the aircraft experienced a loss of altitude and airspeed, culminating in a right bank of over 100 degrees, leading to a collision with trees and subsequent burning. Weather conditions at the time of the incident included 1010.2 hPa, a temperature of 14øC, a dewpoint of 13øC, a relative humidity of 94%, a wind speed of 1 m/s, and visibility of 100 m in fog.

Description

The An-12 was prepared for a cargo flight from Moscow (DME) to Komsomol’sk-na-Amure Airport (KXK) with intermediate stops at Omsk (OMS) and Bratsk (BTK). The takeoff weight was 60500 kg with a 25,7% MAC, which was within limits. The airplane transported 9043 kg of aircraft related materials to the Gagarin Aircraft Manufacturing Association in Komsomolsk-on-Amur (KnAAPO). The engines were started at 04:01. Six minutes later the airplane taxied to runway 32C for departure. As they were lining up the crew commented on the presence of birds in the area. The aircraft took off from Domodedovo Airport runway 32C at 04:15. At 04:16:17 the navigator reported “Safe, ten”, indicating that the airplane had a safe speed and had gained 10 m of height after takeoff. The undercarriage was then retracted. At 04:16:32, at a height of 70-75 m and an airspeed of 295 km/h (159 kts) there was a sound of an engine surge. The propeller of engine no. 4 autofeathered. Practically simultaneously the propeller of engine no. 3 also autofeathered. The airplane lost altitude. In attempting to maintain altitude, the airspeed dropped. In a right bank of more than 100ø, the aircraft struck trees and disintegrated and burned in a forest, about 4 km from the runway end. Weather at 04:30 local time was reported as: 1010.2 hPa, temperature 14C, dewpoint 13C, rel. humidity 94%, wind speed 1 m/s, visibility 100 m in fog. CONCLUSION (translated from Russian): The crash of aircraft An-12 RA-93912 occurred as a result of severe banking and the subsequent collision of the airplane with terrain as a result of a decrease in the airspeed with two feathered engines on the right wing (ca 250-260km/h). The deflection of the rudder and ailerons was insufficient for countering the turn and bank. A decrease in the velocity of the flight of aircraft to the critical value was caused by the deficiency in the available thrust of the two engines (No. 1 and 2) developing takeoff power and by the slipping attitude when the crew attempted to maintain level flight after a practically simultaneous engine No. 3 and 4 cutoff at a height of 70-75m and a speed of about 295 km/h as a result of a collision with birds.

Primary Cause

Severe banking and subsequent collision with terrain caused by a decrease in airspeed with two feathered engines on the right wing (ca 250-260 km/h). The insufficient thrust of the two engines, combined with a slipping attitude, resulted in the aircraft’s inability to maintain level flight.Severe banking and subsequent collision with terrain caused by a decrease in airspeed with two feathered engines on the right wing (ca 250-260 km/h). The insufficient thrust of the two engines, combined with a slipping attitude, resulted in the aircraft’s inability to maintain level flight.

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