On 11 July 2011, Angara Airlines Flight 9007, an

Antonov An-24 The Antonov An-24 (Russian/ Ukrainian: Антонов Ан-24) (NATO reporting name: Coke) is a 44-seat twin turboprop transport/passenger aircraft designed in 1957 in the Soviet Union by the Antonov Design Bureau and manufactured by the Kyiv ...

turboprop passenger aircraft on a domestic service from

Tomsk Tomsk (, ) is a types of inhabited localities in Russia, city and the administrative center of Tomsk Oblast in Russia, on the Tom (river), Tom River. Population: Founded in 1604, Tomsk is one of the oldest cities in Siberia. It has six univers ...

Surgut Surgut ( rus, Сургу́т, p=sʊrˈgut; Khanty: Сәрханӆ, ''Sərhanł, Сө̆ркут, sörkut'') is a city in Khanty-Mansi Autonomous Okrug, Russia, located on the Ob River near its junction with the Irtysh River. It is one of the fe ...

, Russia,

ditched In aviation, a water landing is, in the broadest sense, an aircraft landing on a body of water. Seaplanes, such as floatplanes and flying boats, land on water as a normal operation. Ditching is a controlled emergency landing on the water surf ...

into the

Ob River The Ob (; ) is a major river in Russia. It is in western Siberia, and with its tributary the Irtysh forms the world's seventh-longest river system, at . The Ob forms at the confluence of the Biya and Katun which have their origins in the Alta ...

, after suffering an engine fire. Seven of the 37 people on board died.

Accident

Angara Airlines Joint Stock Company, JSC Angara Airlines () is an airline based in Irkutsk, Russia. It is named after the Angara River. As with all Russian airlines since 2022, it is banned from flying into European Union, EU airspace. Overview Established in ...

flight IK9007 (also designated as Tomsk Avia flight SP5007), took off from

Bogashevo Airport Tomsk Kamov Airport () is an airport that serves Tomsk, Russia. It is located approximately 20 km south-east of Tomsk city center, near the village of Bogashevo in Tomsky District of Tomsk Oblast. In 2018 airport was renamed to commemorate ...

in Tomsk at 10:10 local time (

UTC+7 UTC+07:00 is an identifier for a time offset from UTC of +07:00. In ISO 8601 the associated time would be written as . It is 7 hours ahead of UTC, meaning that when the time in UTC areas is midnight (00:00), the time in UTC+07:00 areas would ...

) on 11 July bound for

Surgut International Airport Surgut Airport , also listed as Surgut North Airport, is an airport in Khanty-Mansi Autonomous Okrug, Russia, located north of Surgut. It services medium-sized airliners. In 2018, Surgut Airport handled 1,758,310 passengers. In May 2019, the ai ...

, with 4 crew and 33 passengers on board. At around 11:36, while the aircraft was cruising at , a

magnetic chip detector A magnetic chip detector is an electronic instrument that attracts ferromagnetic particles (mostly iron chips). It is mainly used in aircraft engine oil and helicopter gearbox chip detection systems. Chip detectors can provide an early warning of ...

signalled the presence of particles in the port (left) engine's oil system. The captain decided to continue the flight, but 8 minutes later a burning smell filled the cockpit and the fire alarm on the port engine briefly activated. The engine was throttled back but not shut down, and the

bleed air Bleed air in aerospace engineering is compressed air taken from the compressor stage of a gas turbine, upstream of its fuel-burning sections. Automatic air supply and cabin pressure controller (ASCPC) valves bleed air from low or high stage engine ...

supply was closed. The crew initiated a diversion to

Nizhnevartovsk Airport Nizhnevartovsk Airport () is a major airport in Russia Russia, or the Russian Federation, is a country spanning Eastern Europe and North Asia. It is the list of countries and dependencies by area, largest country in the world, and ext ...

, and at 11:52, following a sudden drop in the oil pressure and the onset of severe vibrations, the crew realised that the engine was indeed on fire, at which point the engine was shut down and the fire suppression system activated. However, the fire did not extinguish, and the crew elected to ditch immediately into the nearby

. The An-24 came down at 11:56 near

Strezhevoy Strezhevoy () is a town in Tomsk Oblast, Russia, located on the shores of the Ob River's canal. Population: History It was founded in 1966 as a settlement near the village of Strezhevoy and was granted town status in 1978. Administrative and m ...

, approximately south-east of Nizhnevartovsk. Due to the shallow water and the presence of undulations in the river bed, the aircraft was severely damaged in the ditching. Seven of the 37 people on board were killed. Nineteen people were treated for injuries.

Aircraft

The accident aircraft was an

Antonov An-24RV The Antonov An-24 (Russian/ Ukrainian: Антонов Ан-24) (NATO reporting name: Coke) is a 44-seat twin turboprop transport/passenger aircraft designed in 1957 in the Soviet Union by the Antonov Design Bureau and manufactured by the Kyiv, ...

with registration RA-47302. Manufactured in 1975, at the time of the accident it was 36 years old and had accumulated over 48,000 flight hours. It was powered by two

Ivchenko AI-24 The Ivchenko AI-24 turboprop aircraft engine was designed and developed in the late-1950s by the Ivchenko-Progress, Ivchenko design bureau and manufactured thereafter by Motor Sich. It was designed to power Antonov's successful An-24, An-26 and ...

turboprop engines.

Investigation

The

Interstate Aviation Committee The Interstate Aviation Committee (IAC; ) is an executive body of the Civil Aviation and Airspace Use Council of the Commonwealth of Independent States (CIS) and was formed in 1991 Commonwealth of Independent States The Commonwealth of Independent States (CIS) is a regional organization, regional intergovernmental organization in Eurasia. It was formed following the dissolution of the Soviet Union, dissolution of the Soviet Union in 1991. It covers an ar ...

opened an investigation into the accident. Both the

cockpit voice recorder A flight recorder is an electronic recording device placed in an aircraft for the purpose of facilitating the investigation of aviation accidents and incidents. The device may often be referred to colloquially as a "black box", an outdated nam ...

and the

flight data recorder A flight recorder is an electronic recording device placed in an aircraft for the purpose of facilitating the investigation of aviation accidents and incidents. The device may often be referred to colloquially as a "black box", an outdated nam ...

were recovered and examined. In August 2011, the West Siberian Transportation Prosecution Office announced that maintenance of the aircraft was found to be not compliant with Russian regulations, and that maintenance checks for the magnetic chip detector were noted in the aircraft's technical log but were never carried out. Two officials of Angara Airlines were charged. In December 2013, the MAK released its final report. It found that the engine fire had originated with the failure of a support bearing of the compressor rotor, possibly due to a manufacturing defect or an incorrect reassembly of the engine after maintenance. The report also cited as contributing factor the captain's apparent reluctance to shut down the affected engine despite various abnormal indications, which allowed the fire to develop and become inextinguishable.

References

External links

Final accident reportArchived
– Interstate Aviation Committee * {{Portal bar, Aviation, Russia Aviation accidents and incidents in Russia in 2011 Accidents and incidents involving the Antonov An-24 Airliner accidents and incidents involving ditching Airliner accidents and incidents caused by in-flight fires July 2011 in Russia Airliner accidents and incidents caused by engine failure