Date & Time:
Jul 11, 2011 at 1155 LT
Captain / Total hours on type:
Copilot / Total hours on type:
Aircraft flight hours:
Aircraft flight cycles:
While cruising to Surgut at FL197, pilot informed ATC that left engine fired and decided to divert to Strezhevoy Airport. As fire spread to the left of the engine, captain decided to make an emergency landing in the Ob River, few km from airport. Aircraft hits water surface, broken in two and came to rest in shallow water. Seven passengers were killed.
The Interstate Aviation Committee (MAK) released their final report in Russian concluding the probable causes of the accident were:
The catastrophe of the AN-24 RA-47302 occurred when ditching became necessary due to a fire in the left hand engine's nacelle. The destruction of the aircraft and loss of life was caused by collision with underwater obstacles that the crew could not anticipate or avoid.
The fire in the left hand engine nacelle was caused by the fracture of a centrifugal breather releasing an air-fuel emulsion into the engine compartment as well as a delayed reaction to shut the engine down by the crew following an magnetic chip detector indication together with indications of oil pressure fluctuations, a burning smell and a low oil pressure indication.
A delay in indicating engine vibrations to the crew as result of degradation of the engine vibration sensoring equipment, most likely caused by changes of the rotor speed of the engine as result of the aft bearing failure of the compressor rotor and/or misalignment of the sensor, which probably influenced the decision of the crew to shut the engine down with a delay.
Cause of the fracture of the centrifugal breather was the destruction of the impeller due to prolonged exposure to hot air-fuel emulsion due to the failure of the aft compressor rotor support bearing.
It was not possible to determine the cause of the destruction of the aft compressor rotor support bearing due to significant secondary damage. Most likely the destruction was caused by misalignment such as:
- incorrect assembly of support parts mating with the compressor rotor during on-condition engine repairs
- or deviations from required geometry of support parts mating with the compressor rotor.
Contributing factors were
- psychological unpreparedness of the captain to shut the engine down due to lack of experience with the aircraft on one engine inoperative
- late detection of the fire and as a consequence late attempts to extinguish the fire, it was however not possible to establish why the fire was detected late due to lack of objective information about the performance of the fire alarm systems.