Il-12 crash in Alma-Ata
Aeroflot (Kazakh Directorate of the Civil Air Fleet, 151st aviation detachment) Ilyushin Il-12 · Maintenance violations, crew error
From Alma-Ata to Vnukovo, Moscow
Event
- Event typeAccident: someone killed or seriously injured, or the aircraft substantially damaged (NTSB definition). Incident: an occurrence that affected or could have affected safety, short of that. Glossary
- Accident
- Event fatalities
- 1 · all aircraft and ground
- Ground fatalities
- Unknown
- Occupants
- Unknown
- Survivors
- 18
- InjuriesFatal: death within 30 days. Serious: over 48 hours in hospital within a week, most broken bones, severe bleeding, nerve or organ damage, or serious burns. Minor: anything less. Glossary
- 6
- OperationWhat kind of flying it was, grouped by the rules it flew under: airline (US Part 121), air taxi and commuter (Part 135), general aviation (Part 91 and similar), military or government. Glossary
- Airline
Ilyushin Il-12
- Aircraft type
- Ilyushin IL-12
- Category
- Airplane · from aircraft type
- RegistrationThe aircraft's tail number, such as N12345 or G-ABCD. Registrations are reissued, so the same one years apart can be a different aircraft. Glossary
- CCCP-L1320
- Onboard fatalities
- 1
- Route
- From Alma-AtaTo Vnukovo, Moscow
Cause areas
- Aircraft › Aircraft handling/service
- Aircraft › Aircraft power plant
- Personnel issues › Psychological
From the investigation findings the Wikipedia article reports, sorted into the NTSB's cause areas with AI assistance.
Not plotted · Not plotted: the Wikipedia article gives no coordinates, and its site names no town or airport that matches exactly.
From the Wikipedia article
On Sunday 5 December 1954 an Il-12 of the Aeroflot company crashed in Alma-Ata, killing 1 person.
Crash
The aircraft was operating passenger flight 98 from Alma-Ata to Moscow with the first intermediate landing in Karaganda, and it was flown by a crew consisting of the commander (PIC) G. V. Markov, co-pilot A. I. Kukushkin, flight engineer G. I. Pereverzev and flight radio operator D. I. Sterlingov. Flight attendant N. G. Bondak worked in the cabin. In total there were 14 passengers on board. Training of the co-pilot was also included in the flight assignment. Although under the conditions of a scheduled flight it should be conducted only from the right seat, the commander on his own authority seated the co-pilot in the left seat, himself sitting in the right. Departure was to take place at 19:45 (16:45 Moscow time), but owing to an equipment fault it was postponed by an hour. At 17:45 flight 98 took off from Alma-Ata airport.
In the sky at that time there were scattered clouds, a light north-westerly wind, haze, visibility was 4 kilometres, and the air temperature was -25 °C. Soon after take-off, at 20:47, the aircraft reported: "Take-off completed, everything is in order on board". But when the Il-12 had climbed at a speed of 200 km/h to a height of 100—120 metres, the co-pilot saw flames on the left engine and reported a fire to the crew. The commander also saw the reflections of the flames, clearly visible in the darkness, and when the flight engineer also confirmed them, he gave the command to feather the left propeller. The commander, intending to knock down the flames, also put the airliner into a sideslip to the right with a vertical speed of 3—4 m/s, as a result of which he lost about 20—30 metres of height. Then at a height of 70—80 metres the propeller feathered, and the bright flames stopped. The commander then began a left turn to approach for landing at Alma-Ata airfield. At 20:48 the crew reported to the controller: "Flying on one engine", after which communication was cut off.
Since the aircraft continued to descend, the commander gave the command to the flight engineer: "boost on the right engine!", which was done. The asymmetric thrust began to turn the airliner to the left, which created considerable loads on the rudder. Feeling that deflecting the rudder to the right (to compensate for the moment) required considerable effort, the commander ordered the flight engineer to take off the boost, and the co-pilot not to interfere and to watch the instruments. After receiving the command, the right engine was brought to rated power, which did not stop the aircraft's descent. The commander then gave the command to increase the power of the right engine, but the forward speed dropped to 170—180 km/h, and the loss of height did not stop. The commander then decided to land at the Pervomayka military airfield, located along the flight route.
At a height of 15—20 metres the Il-12 approached the airfield, but then the commander saw that there was a ravine about 100 metres wide in front of him. Fearing that he would not clear this ravine, the commander turned the airliner 90° to the left in the direction of residential buildings. Losing height in the process, the Il-12 during the manoeuvre struck with its right wing a guard hut standing at the edge of the ravine, and then knocked down several small trees and two telegraph poles. The airliner, with its right engine running, then landed "on its belly" (with the landing gear retracted), slid about 160 metres and at 20:55 (17:55 Moscow time) crashed into a brick shed and a cement rubbish pit of a military unit. From the impact the forward part of the fuselage, including the cockpit, was destroyed up to frame 15, the centre section with the wings was deformed, and the tail section (from frame 33) was torn off. As a result of the accident the flight attendant was killed, and the flight crew (4 people) and 2 passengers were injured.
Investigation and cause
Investigation
As it was possible to establish, before this departure aircraft L1320 had undergone the 25-hour form of maintenance, and the work carried out was of low quality. When the crew began to accept the aircraft after completion of the work, the flight engineer discovered that the left propeller would not feather, and also that the autopilot and the radio compass were not working. When these defects had been rectified, the senior shift foreman and the quality control (OTK) inspector went home, and an aircraft technician and a mechanic remained to release the airliner. Then, when the engines were switched off at the loading area, the flight engineer heard a hissing in the left engine, so he decided to check the serviceability of the air self-starter valves on the cylinders. He and the aircraft technician found poor tightening of the valve body and the air supply tube at the air self-starter valve of cylinder 10, so they removed and disassembled the body. Next the two of them made sure that the defect had been rectified, so the aircraft technician put the valve back. But in doing so he mistakenly turned the valve stem nut upside down and did not lock it, and the flight engineer did not check the assembly. As a result, during the climb this valve burned through, and this happened with the engine at rated power, so a strong and bright flame arose. It was this flame that the crew took for a fire.
Causes
Burn-through of the air self-starter valve of cylinder 10 of the left engine owing to poor maintenance, taken by the crew …
Translated into English with AI assistance from the Russian Wikipedia article “Катастрофа Ил-12 в Алма-Ате” (revision 154541730, retrieved 2026-09-19) by its authors, under CC BY-SA 4.0. Extracted as plain text: references, tables, images and some sections are left out; the translation may contain errors, and long articles were cut to their first 700 words. Read the article
Sources
Russian Wikipedia article: Катастрофа Ил-12 в Алма-Ате
- Article
- Катастрофа Ил-12 в Алма-Ате
- Translation
- Into English with AI assistance; names of linked operators and aircraft types from Wikidata. It may contain errors.
- Revision
- 154541730 · 2026-08-19 · retrieved 2026-09-19
- Wikidata
- Q16488139
- Licence
- Text CC BY-SA 4.0, by the article's authors; Wikidata CC0; town positions GeoNames (CC BY 4.0)
Where each value comes from
- Record
- ru Wikipedia article "Катастрофа Ил-12 в Алма-Ате" (page 4587747, revision 154541730), translated into English with AI assistance
- Date
- Wikipedia infobox: date
- Place and country
- Wikipedia infobox: site
- Map position
- none
- Aircraft, operator and route
- Wikipedia infobox: aircraft type, registration, operator, origin and destination; route airports from the linked airport articles' Wikidata codes (OurAirports)
- Operation
- operator is an airline according to Wikidata
- Fatalities
- Wikipedia infobox: aircraft fatalities
- Ground fatalities
- not stated in the Wikipedia infobox
- Summary
- Wikipedia infobox: summary
Source notes (1)
- Wikipedia · Facts from the Russian Wikipedia article's infobox, translated into English with AI assistance, not checked against an investigation report. Independent review pending.