Aeroflot Flight 227 (1969)

Aeroflot Flight 227 was a scheduled scheduled passenger flight in the Soviet Union between Roshchino and Nizhnevartovsk. On 13 October 1969, during landing at Nizhnevartovsk Airport, the flight's Antonov An-24B crashed, resulting in 24 fatalities.
Aircraft
The Antonov An-24 with registration 47772 (serial number 79901404) was produced by the Antonov plant in 1967. At the time of the accident, the airliner had accumulated a total of 2,756 flight hours and 2,298 landings.
In Nizhnevartovsk, there were clouds with a base at 350 meters and visibility of 3,500 meters. The first approach was unsuccessful, and at 17:19, the crew went around for another attempt. At 17:26, the captain reported to the controller that they were ready for landing and confirmed visual contact with the runway. While on final approach, the aircraft rolled right and at 1,100 meters from the runway threshold (190 meters to the outer marker), and 50 meters to the right of its centerline, it struck the ground among small trees, subsequently breaking apart and partially burning. The accident resulted in the deaths of the First Officer, flight attendant, and 22 passengers.<ref name="airdisaster.ru" />
Causes of the accident
The commission members could not reach a consensus, leading to two different conclusions regarding the causes.
Conclusion of the Ministry of Civil Aviation
The occurrence of negative thrust from the propellers during the landing descent phase was due to the throttle lever being set to 12° by the fuel control lever indicator (a design flaw in the aircraft). The attempt to correct this by increasing the engines to takeoff power and retracting the landing gear was unsuccessful due to the low altitude. The crew did not violate the Flight Operations Manual.<ref name="airdisaster.ru" />
An error in estimating the altitude and distance from the runway during the final approach led to a descent below the normal glide path, followed by a stall during an attempted go-around upon realizing the dangerously low altitude. The stall was caused by extending the flaps to 17° instead of 38° as per the FOM.<ref name="airdisaster.ru" />

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