Date & Time:
Aug 9, 2011 at 1434 LT
Komsomolsk-on-Amour - Magadan - Keperveyem
Captain / Total hours on type:
Copilot / Total hours on type:
Aircraft flight hours:
Aircraft flight cycles:
Aircraft was performing a cargo flight from Komsomolsk-on-Amur to Keperveem with an intermediate stop in Magadan. It carried 17,58 tons of various cargo, two passengers and a crew of nine. Enroute, crew informed ATC about a fuel leak and an engine failure. While cruising at a height of 1,000 metres, aircraft hit tree and crashed, killing all eleven occupants. This Antonov AN-12 was the oldest aircraft in commercial use in Russia.
The probable causes of the crash were:
Following the inflight shut down of engine number one and feathering of the number one propeller the longitudinal (roll) control of the aircraft was lost due to load-bearing properties of the left wing and possible damage to the left hand aileron control wiring resulting in the aircraft's uncontrolled excessive roll to the left and subsequent impact with terrain. The fire started in the tail section of the #1 engine nacelle and spread forward and onto the wing. The fire was most likely fed by fuel leaking from a fuel line connection to the low pressure fuel pump at engine #1, the fuel most likely ignited due to contact with hot engine parts. Due to the disintegration of the aircraft and fire damage it was not possible to establish the location of fuel leaks and the cause with certainty. The inability of the fire suppression system to extinguish such a fire in its early stages as well as the lack of checklists/guidelines in the aircraft's flight manual for fuel leaks inside the engine nacelle contributed to the delay of more than 2 minutes to shut the engine down. The mountainous terrain underneath the aircraft, low level overcast cloud and lack of time due to continued fire did not permit the crew to select a proper site for an emergency landing.