Aeroflot Flight 315 (1960)

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Aeroflot Flight 315 (1960)
SSSR-11205 An-10.jpg
An Antonov An-10 similar to the accident aircraft
Accident
Date26 February 1960 (1960-02-26)
SummaryTail icing, loss of control
Sitenear Snilow Airport
Aircraft
Aircraft type Antonov An-10A
Operator Aeroflot
Registration CCCP-11180
Flight origin Vnukovo International Airport
Destination Snilow Airport
Occupants33
Passengers25
Crew8
Fatalities32
Survivors1

Aeroflot Flight 315 (1960) was a regularly scheduled passenger flight operated by Aeroflot from Vnukovo International Airport in Moscow to Lviv Airport in Lviv, Ukraine; at the time, both were in the Soviet Union. On 26 February 1960, the An-10 operating this flight crashed short of the airport runway while on final approach. 24 passengers and eight crew members were killed, one passenger survived.

Contents

The Air Accident Investigation Commission concluded the cause of the accident was a combination of design flaw and icing.

Accident

Flight 315 departed Vnukovo Airport at 14:38 Moscow time, and was cleared to climb to 7,000 meters. At 16:35 as the airliner approached Lviv the crew received clearance to descend to 4,000 meters. Weather was reported as a cloud base of 150-200 meters in icing conditions with visibility at three km. The descent was normal and the pilot reported reaching the marker beacon at an altitude of 200 meters, the flight was then cleared to land. When the aircraft penetrated the cloud base the crew switched to visual flight rules (VFR). While descending through 95 meters the flaps were set to 45 degrees and the Antonov began a rapid pitch down. The crew briefly regained control but the nose pitched down again and at 16:57 impacted the ground 1,400 meters short of the runway with pitch down attitude of 20-25 degrees. [1]

Aircraft

Construction of the AN-10 involved, serial number 9401801-18-01, was completed at the Voronezh aircraft factory on 24 January 1960 and it was transferred to the civil air fleet. At the time of the accident, the aircraft had sustained a total of 109 flight hours.

Investigation

Because the aircraft was in operation for only six days after release from the factory the Air Accident Investigation Commission decided it was unlikely that mechanical failure was the root cause of the accident. The evidence gathered from the investigation of Flight 315 on 26 February 1960 three months earlier was further scrutinized. Testing eventually revealed that icing of the horizontal stabilizer created a supercritical angle of attack, that caused a sudden pitch down of the aircraft when the flaps are lowered to the maximum setting of 45 degrees. A contributing factor was the speed with which the flaps deployed. 35 degrees in eight seconds was deemed disproportionally rapid. To abate this concern ice protection systems for the stabilizer were improved and selection of flaps beyond 15 degrees in known icing conditions was disallowed. [1]

See also

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References

  1. 1 2 "Friday 26 February 1960". aviation-safety.net. Aviation Safety Network. Retrieved 28 July 2019.