Investigation Summary
Flight 9949 was a scheduled passenger service operating in the Ust-Yansky district. The flight departed Deputatsky at 23:51 local time, approximately 51 minutes behind schedule, after the crew received a meteorological forecast they deemed acceptable for VFR operations. Seven minutes after takeoff, the crew made their final radio contact with dispatch. While en route, the weather deteriorated significantly. Rather than returning to Deputatsky or diverting, the Pilot in Command (PIC) continued the flight, eventually descending below the safe altitude for the mountainous region in an unauthorized attempt to maintain visual contact with the ground. The helicopter collided with a 45-degree rocky slope at an elevation of 650 meters, specifically striking the terrain with its tail crutch and main landing gear wheels at a high pitch angle. The Interstate Aviation Committee (MAK) found that the PIC lacked the necessary proficiency and skills for Instrument Flight Rules (IFR) operations, a deficiency that had not been identified by the Federal Air Transport Agency (FATA) during the licensing process. Furthermore, the investigation highlighted systemic failures within Polar Airlines, including inadequate crew training for mountainous operations and a failure to provide the crew with detailed flight route and altitude data available in the official flight plan.
Final Conclusions
The Interstate Aviation Committee (MAK) concluded that the accident was caused by the PIC's non-compliance with Visual Flight Rules, specifically the failure to return to the departure aerodrome when weather conditions deteriorated. Contributing factors included unsatisfactory crew training regarding altitude profiles in mountainous terrain, poor standard operating procedures, and the airline's failure to communicate specific flight plan data to the crew. The investigation also noted that the Ground Proximity Warning System (GPWS) was not utilized; had it been active and the crew properly trained in its use, the accident might have been prevented. Passenger fatalities were exacerbated by loose luggage and mail in the cabin, the non-use of safety belts, and improper seating arrangements for children.
Video Analysis
Эвакуация пострадавших — Footage showing the evacuation of survivors from the remote mountainous crash site of the Polar Airlines Mi-8 in the Sakha Republic.
If playback is blocked, the owner has disabled embedding — use the link above.
Airframe & Maintenance
Systems & Failure Modes
GPWS
The Ground Proximity Warning System was installed but not turned on or utilized by the crew during the flight.
MS-61 CVR
A cockpit voice recorder using wire bobbins; the units recovered were damaged by fire and failed to provide relevant audio for the investigation.
SDK-8 system
The flight data recording system, which suffered fusion traces and mechanical damage, rendering the memory module unreadable.
Interesting Facts
- 01The helicopter struck the mountain at a high pitch angle, evidenced by tail crutch and main gear marks without nose gear contact.
- 02The crash site was located at an altitude of 650 meters on a ridge reaching 772 meters.
- 03The specified safe pressure height for the flight segment was 1300 meters.
- 04The MS-61 cockpit voice recorder bobbins recovered from the site contained no data from the accident flight.
- 05The FDR memory module was found to be beyond repair due to high-temperature exposure from the post-crash fire.
- 06One passenger initially survived the impact but later died from their injuries, bringing the total fatalities to 24.
Safety Actions & Advisories
Crew Training Enhancements
Source ↗MAK recommended mandatory preliminary flight training for all personnel regarding altitude profiles and ground elevation in mountainous terrain.
GPWS Operational Requirements
Source ↗Recommendations were made to ensure appropriate crew training on the active use of Ground Proximity Warning Systems during all phases of flight.
Cargo and Passenger Safety
Source ↗The investigation prompted a review of regulations regarding the securing of mail and cargo in passenger cabins and the enforcement of safety belt use.