|Aircraft registration number||RA-25607|
|Place of aircraft departure|
|Airport of departure|
|Intended Airport of arrival|
|Accident site||in Kargasoksy district of the Tomsk region|
|Aircraft owner||"Gazpromavia" aviation enterprise" Ltd|
|The date of the completion of the investigation (report)||21.12.2016|
|Number of fatalities||0|
|Degree of aircraft destruction||aircraft substantially damaged|
report_ra-25607.pdf (3.42 MB)
|Works type||Aerial works|
The accident with Mi-8 RA-25607 helicopter owned by "Gazpromavia" aviation enterprise" Ltd occurred in Kargasoksy district, Tomsk region (RF) on July 14, 2013. Three crew members and 14 passengers were on board. According to the preliminary information first officer and passengers suffered injuries of various degrees of severity, the rotorcraft was partially destroyed.
The Interstate Aviation Committee has assigned the Investigation team of the accident in accordance with the Russian Aviation Legislation. The Investigation team has started its work.
Flight recorders of Mi-8T RA-25607 helicopter involved in the accident in the Tomsk region (RF) on July 14 were delivered to the Interstate Aviation Committee on Julyn18.
The Interstate Aviation Committee experts carried out activities on data recovery and readout on July 18-22, 2013.
All FDR and Navstar receiver recorded data was copied and transferred to the Investigation team for further analysis.
All read voice data contained on MC-61 tape recorder reels detected at the accident site does not refer to helicopter operation on July 14, 2013.
Most probably the accident with Мi-8Т RA-25607 helicopter was caused by crew uncoordinated actions during take-off resulted in helicopter accelerated left rotation and its ground impact.
Contributing factors could be:
• PIC helicopter control intervention without providing information to the rest of the crew;
• partial loss of situational awareness and/or spatial disorientation in helicopter accelerated left rotation.
Hazard factors were identified in course of the investigation: autopilot connector contamination due to its leakage and specific operating performance wide-range scatter of RA-60B actuator prototype in control directional axis (in compliance of each particular prototype with requirements) which in certain conditions can significantly increase inflight emergency situation risk. However no aeronautical equipment failure evidence which could effect emergency flight result were identified.
The appropriate safety recommendations based on the investigation results were developed.