Aeroflot flight 1661

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Aeroflot flight 1661
Antonov An-24B, Aeroflot AN1089475.jpg

Aeroflot aircraft of the same construction

Accident summary
Accident type Collision with an object in the air
place 20 km southeast of Toguchin , Soviet Union
date April 1, 1970
Fatalities 45
Survivors 0
Aircraft
Aircraft type Antonov An-24B
operator Aeroflot
Mark CCCP-47751
Departure airport Novosibirsk-Tolmachevo Airport
Stopover Emelyanovo Airport
Destination airport Bratsk airport
Passengers 40
crew 5
Lists of aviation accidents

On April 1, 1970, a 3-year-old Antonov An-24 B crashed on the inner-Soviet scheduled flight Aeroflot flight 1661 from Novosibirsk via Krasnoyarsk to Bratsk on the first section, killing all 45 passengers.

Inmates

The crew consisted of a flight captain , a first officer , a flight engineer , a navigator and a flight attendant . There was an ice hockey team among the passengers .

course

The An-24 took off at 3:42 a.m. local time and climbed in a left turn to 1,500 m and continued to climb on the planned course. When the plane reached an altitude of 4,200 m, the reported pilots in the air traffic control . At 3:53 am they received clearance to climb to 6,000 m. When the air traffic controller made radio contact at 4:10 a.m., he received no answer.

The partially burned debris was found in a field 20 km southeast of Toguchin and 142 km east of the departure airport.

Weather

The weather in this area on that day was very cloudy (10 points or an coverage of 8/8), with the clouds having a lower limit of 900 m and an upper limit of 11,000 m.

root cause

The debris of two weather balloons from the weather service and the cockpit were found outside the main wreck. This included the windshields and parts of the aircraft nose that housed the aircraft's radar ; they showed signs of collision with a solid object in the air. Investigators concluded that the aircraft was climbing through the clouds in the nightly darkness at an altitude of 5,400 m into a weather balloon. The pilots lost control and the aircraft went into a dive , in which both wings and the entire tail unit broke off at an altitude of 2,000 m and a speed of 700 km / h . The remainder of the fuselage hit the ground at 4:07 a.m., 25 minutes after take-off, at a horizontal speed of 300 km / h and a vertical speed of 216 km / h.

Similar accidents

On January 21, 1973, another An-24 had an accident under similar circumstances (see Aeroflot flight 6263 ).

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