On February 25, 1970, an Ilyushin II-14 (registration CCCP-61637) operated by Aeroflot - Russian International Airlines was involved in an aviation accident near Ust-Maya, Russia during takeoff. 5 people were killed. Investigators recorded the probable cause as: The right propeller developed negative thrust during initial climb. This summary draws on records from the Bureau of Aircraft Accidents Archives (B3A); 8 related events involving the same aircraft type or operator are linked below.
During a night positioning flight, a right propeller malfunction caused negative thrust shortly after takeoff. The aircraft crashed in a forest, killing all 5 crew members.
Accident
On a night positioning flight from Ust'-Maya to Yakutsk, the aircraft departed with its center of gravity outside the forward limit of the weight and balance envelope. Shortly after takeoff, a malfunction caused the right propeller to develop negative thrust. The resulting asymmetric forces occurred at an altitude too low for the crew to counteract. The aircraft crashed into a forest 1,350 meters behind the runway threshold and 310 meters to the right of the extended runway centerline. All five crew members on board were killed.
Probable Cause
According to the official investigation, the probable cause of the accident was that the right propeller developed negative thrust during the initial climb.
What happened in the 25 Feb 1970 Ilyushin II-14 accident near Ust-Maya, Russia?
During a night positioning flight, a right propeller malfunction caused negative thrust shortly after takeoff. The aircraft crashed in a forest, killing all 5 crew members.
Were there any fatalities in the 25 Feb 1970 Ilyushin II-14 accident?
The accident was fatal, resulting in 5 fatalities.
What aircraft was involved and where did it happen?
The accident on 25 Feb 1970 involved an Ilyushin II-14, registration CCCP-61637, operated by Aeroflot - Russian International Airlines, at Ust-Maya, Russia.
What was the probable cause of the accident?
The right propeller developed negative thrust during initial climb.
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