On December 4, 1984, a Let L-410 (registration CCCP-67225) operated by Aeroflot - Russian International Airlines was involved in an aviation accident near Kostroma, Russia during takeoff. 10 people were killed. Investigators recorded the probable cause as: The exact cause of the accident could not be determined with certainty as investigations were hampered because the aircraft was not equipped with CVR/FDR. This summary draws on records from the Bureau of Aircraft Accidents Archives (B3A).
A twin-engine aircraft crashed shortly after takeoff from Kostroma Airport, killing all 10 on board. Investigators believe the pilot lost control due to spatial disorientation from a horizontal gyro malfunction.
Incident Overview
On the day of the accident, a twin-engine aircraft departed Kostroma Airport at 0809 local time on a flight to Ivanovo. The aircraft carried eight passengers and two pilots. After takeoff, while climbing in marginal weather conditions, the crew was instructed by air traffic control to report once reaching an altitude of 1,800 meters. However, the crew failed to respond. The aircraft subsequently entered an uncontrolled descent and crashed in a wooded area located 11 kilometers north of the airport. The impact destroyed the aircraft and killed all ten occupants.
Investigation and Probable Cause
The official investigation into the accident determined that the exact cause could not be established with certainty because the aircraft was not equipped with a cockpit voice recorder (CVR) or flight data recorder (FDR). Nonetheless, investigators believe that the pilot-in-command lost control of the airplane after suffering spatial disorientation. This disorientation was attributed to the malfunction or dysfunction of the horizontal gyro. The investigation was hampered by the lack of recorded flight data.
Frequently asked questions
What happened in the 4 Dec 1984 Let L-410 accident near Kostroma, Russia?
A twin-engine aircraft crashed shortly after takeoff from Kostroma Airport, killing all 10 on board. Investigators believe the pilot lost control due to spatial disorientation from a horizontal gyro malfunction.
Were there any fatalities in the 4 Dec 1984 Let L-410 accident?
The accident was fatal, resulting in 10 fatalities.
What aircraft was involved and where did it happen?
The accident on 4 Dec 1984 involved a Let L-410, registration CCCP-67225, operated by Aeroflot - Russian International Airlines, at Kostroma, Russia.
What was the probable cause of the accident?
The exact cause of the accident could not be determined with certainty as investigations were hampered because the aircraft was not equipped with CVR/FDR. Nevertheless, it is believed that the pilot-in-command lost control of the airplane after he suffered a spatial disorientation caused by the…
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