Aviation accident in the Soviet Union
The 1969 Vnukovo Airport Il-18 crash was a plane crash at Vnukovo Airport on 26 August 1969. Of the 101 people on board, 16 were killed.
Aircraft.
The Il-18B aircraft, with tail number 75708 (factory number 189001705, serial number 017-05), was manufactured by the MMZ "Banner of Labor" on 26 December 1959.
By 23 January 1960, the aircraft entered service with the 235th Separate Aviation Detachment. On 23 July 1961, it was used to transport the first cosmonaut, Yuri Gagarin, to Egypt. On 12 October 1961, the aircraft was transferred to the Polar Aviation Administration. On 11 January 1968, the aircraft was assigned to the Vnukovo Aviation Detachment of the Moscow Civil Aviation Administration.
By the time of the crash, the aircraft had logged a total of 12,023 flight hours and 4,367 landings.
Flight.
The aircraft was operating flight 1770 on the route Sochi—Moscow—Norilsk. It was piloted by a crew from the 65th Flight Detachment: Captain Anatoly Khomchenko, Co-pilot Viktor Brakhnov, Navigator Valery Voronkov, Flight Engineer Ivan Mukhin, and Radio Operator Olga Petrova. Flight attendants Inna Gorelova and Natalia Terekhova worked in the cabin. After takeoff from Sochi Airport and reaching cruising altitude, the aircraft maintained an altitude of . There were 94 passengers on board.
As the aircraft approached Moscow in the evening, the captain instructed the radio operator to read the checklist for descent and landing. The radio operator then read the checklist up to the "Landing Gear" item, as the other items had to be performed after the landing gear was extended during the approach. At 20:18, the aircraft began its descent from 7,800 meters to 5,100 meters toward Serpukhov; weather and air traffic conditions were normal. According to the standard approach procedure, the landing at Vnukovo Airport should have followed a rectangular pattern. However, the captain was determined to take a shortcut to descend to the correct altitude by the third turn, thus avoiding the rectangular pattern. As a result, the Il-18 descended at a vertical speed of 28 m/s, nearly three times the allowable 10 m/s, which violated the limitations specified in the flight operations manual (FOM).
During further descent, the aircraft leveled off at 1,200 meters and reached the calculated point when the controller instructed a 30° turn to ensure the necessary landing interval. However, they did not specify the position of the other aircraft. The crew, in a state of agitation due to the rush for landing, began searching for the other aircraft and thus forgot to perform one of the critical steps in the landing preparation: lowering the landing gear. This oversight was additionally possible due to the deactivation of the warning siren for the retracted landing gear; this had been allowed by the Civil Aviation Administration's regulations, as the warning siren could prevent crew members from hearing each other. However, deactivating the siren also disabled the landing gear position indicator lights which shared the same circuit breakers with the audible system (although the gear position could still be monitored by the indicators on the instrument panel). As a result, the warning system was never reactivated.
After completing the fourth turn and aligning with the final approach, the captain forgot to instruct the flight engineer to read the remaining checklist items. The flight engineer, in turn, also forgot and did not check the landing readiness, thus failing to notice that the landing gear was still retracted. After passing the outer marker, the crew did not report landing readiness, but the tower controller, not waiting for the required report, still cleared the aircraft to land on the runway.
Accident.
At 20:31, the Il-18 landed on its belly, due to the retracted landing gear, at Vnukovo Airport. Upon impact with the runway, the propeller blades began breaking and flying in all directions, including into the fuselage. Blade fragments punctured the fuselage skin and damaged the hydraulic lines, as well as electrical wiring. The leaked AMG-10 hydraulic fluid then ignited, causing a fire that began spreading through the cabin. The aircraft skidded 1,180 meters down the runway before coming to a stop. The pilots, still unaware of what had happened, activated the engine fire suppression systems, forgetting about the passengers in the cabin. The navigator then rushed to the cabin and found it filled with smoke. Together, with the flight attendants and passengers, the navigator opened the front and rear entrance doors and two of the four emergency exits.
Unaware that the landing had been on the belly and believing that the landing gear was extended, the navigator and flight attendants tried to hold back the passengers, fearing they might be injured by falling from a high height. However, the panicking crowd pushed the flight attendants outside. In the evening darkness, the evacuation was chaotic and took more than three minutes. Contrary to the "women and children first" rule, women with children were among the last to leave, according to the navigator. No one counted the evacuated passengers, so it remained unclear how many people were still inside. Meanwhile, the crew members in the cockpit escaped through the windows.
Airport emergency services arrived at the crash site only 15–20 minutes later and soon extinguished the fire. Both passenger cabins were heavily burned, but none of the survivors suffered burns, and even their clothing showed no signs of fire exposure. Nonetheless, 16 passengers died in the incident: two men, ten women, and four children. All died from smoke inhalation, with 15 perishing at the rear of the second cabin and one at the front of the first.
Causes.
The main cause of the crash was the improper performance of their duties by the captain and the flight engineer during the preparation and execution of the landing; such procedures are defined in the FOM and the crew's standard operating procedures during approach. This led to the landing being carried out with the landing gear retracted. The immediate cause of many of the fatalities was smoke inhalation resulting from a fire that started when AMG-10 hydraulic fluid ignited due to an electrical short circuit in the aircraft's wiring.
The following factors also contributed to the crash:
References.
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