Engine Failure Leads to Forced Landing of Mi-2M Helicopter in Russia

No fatalities • РФ, ХМАО, Тюменская область, в 5 км севернее п. п. Уват

An engine failure during a pipeline survey flight forced the pilot of an Mi-2M helicopter to perform an emergency landing near Uvat, Russia.

On August 6, 2018, an Mi-2M helicopter, registration RA-15629, operated by OOO 'Aviaкомпания "Velthal - Avia"' was conducting a flight to survey an oil pipeline and prepare maps for an upcoming aerial survey. The flight involved several legs, including a takeoff from the 'Nagorny' landing site following a refueling stop at the 'Osinnik' landing site.

Six minutes after departing from the 'Nagorny' landing site, the aircraft's left engine unexpectedly shut down. The pilot-in-command made the decision to perform a forced landing at a landing site selected from the air. There were no injuries or fatalities reported following the incident.

The investigation into the failure of the GTD-350 engine on RA-15629 determined that the engine shut down due to a malfunction in the electromagnetic valve. Specifically, the third core of the valve jammed in the open position.

Technical analysis revealed that the jamming was caused by foreign metallic particles entering the gap between the valve core and the coil housing. These particles originated from the end surfaces of the valve core and the associated coil due to improper mechanical processing during the manufacturing stage.

Probable cause

The engine failure was caused by the jamming of the electromagnetic valve core in the open position, resulting from the ingress of metallic particles into the valve housing caused by poor manufacturing processes.

Frequently asked questions

What happened in the 2018-08-06 Ми-2М accident near РФ, ХМАО, Тюменская область, в 5 км севернее п. п. Уват?

An engine failure during a pipeline survey flight forced the pilot of an Mi-2M helicopter to perform an emergency landing near Uvat, Russia.

Were there any fatalities in the 2018-08-06 Ми-2М accident?

No fatalities were recorded in this accident.

What aircraft was involved and where did it happen?

The accident on 2018-08-06 involved a Ми-2М, registration RA-15629, operated by ООО «Авиакомпания «Вельталь - авиа», at РФ, ХМАО, Тюменская область, в 5 км севернее п. п. Уват.

What was the probable cause of the accident?

The engine failure was caused by the jamming of the electromagnetic valve core in the open position, resulting from the ingress of metallic particles into the valve housing caused by poor manufacturing processes.

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