Aeroflot Flight 315 (1960)

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Aeroflot Flight 315 (1960)
An-10 in Monino.jpg

Aeroflot aircraft of the same construction
Accident summary
Accident type Loss of controllability due to icing
place Lviv Airport , Ukrainian SSRUkraine Soviet Socialist RepublicUkrainian SSR 
date February 26, 1960
Fatalities 32
Survivors 1
Aircraft
Aircraft type Soviet Union 1955Soviet Union Antonov An-10 A
operator Soviet Union 1955Soviet Union Aeroflot
Mark Soviet Union 1955Soviet Union CCCP-11180
Departure airport Moscow Vnukovo Airport , Russian SFSRRussia Soviet Federal Socialist RepublicRussian SFSR 
Destination airport Lviv Airport, Ukrainian SSRUkraine Soviet Socialist RepublicUkrainian SSR 
Passengers 25th
crew 8th
Lists of aviation accidents

On February 26, 1960, an Antonov An-10 crashed on the inner-Soviet scheduled flight Aeroflot flight 315 from Moscow to Lviv , killing 32 of the 33 occupants.

plane

The aircraft concerned was an Antonov An-10A ( aircraft registration number : CCCP-11180 , serial number : 9401801 ), which was completed on November 30, 1959 and since its first use on January 24, 1960, had completed 109 operating hours and was last 6 days before the accident in the factory.

course

The An-10 was scheduled to fly four flights that day; first from Kiev to Lviv, then from Lviv to Moscow, from Moscow to Lviv and finally from Lviv to Kiev. The crew was changed in Moscow. The An-10 then took off for the third flight at 14:38 and rose to a cruising altitude of 7,000 m. At 16:35, the pilots reported the flight into the airspace of Lviv and shortly afterwards at 16:48 initiated the descent to 4,000 m on the instructions of the air traffic controller . At 16:42 the pilot gave the pilot the instruction to descend to 2,400 m and the landing conditions. The pilots adhered to the given approach pattern and reported that they had passed the outer marker at an altitude of 200 m . The controller saw the aircraft and ensured that the approach was being carried out correctly and asked about the landing gear and whether the propellers were firmly set. This was confirmed and the controller gave clearance to land. The An-10 broke through the cloud cover and the pilots fully extended their flaps (by 45 °). As a result, the nose dropped to a height of 90-100 m. Initially, the pilots were able to intercept the aircraft in 60–70 m, which then went into a dive . It struck at 16:57 with its nose tilted downwards by 20-25 ° ( pitch angle ) in swampy terrain, 1,400 m from the runway threshold and slid 150 m further, breaking apart without catching fire. 3 passengers were found alive at the scene of the accident, one of whom died on the way to the hospital and another died in the hospital. One man (born 1927) was the only one who survived seriously injured.

Investigations

Just one year before another An-10 was on the same flight on approach to Lviv in similar circumstances accident , the true cause was not found. Tests showed that the design of the An-10 in icing conditions made it prone to lowering its nose with its flaps extended and diving into a dive, which was the cause of the two accidents. This happened because under such circumstances the angle of attack on the horizontal stabilizer reached supercritical values. In addition to the design, the accident also involved the fact that the landing flaps were extended disproportionately quickly (by 35 ° in 8 s) and pilots pulled less hard on the control horn to counteract the downward pitching moment when they extended the flaps. Due to the low altitude, the aircraft could not be intercepted in time.

consequences

The flight manual was changed after the two accidents in such a way that it prohibited the flaps from being extended by more than 15 ° in icing conditions. The de-icing system for the horizontal stabilizer has also been improved.

swell