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 Kyiv, Ir ...

turboprop passenger aircraft on a domestic service from

Tomsk Tomsk ( rus, Томск, p=tomsk, sty, Түң-тора) is a city and the administrative center of Tomsk Oblast in Russia, located on the Tom River. Population: Founded in 1604, Tomsk is one of the oldest cities in Siberia. The city is a n ...

to Surgut, Russia, ditched into the

Ob River } The Ob ( rus, Обь, p=opʲ: Ob') is a major river in Russia. It is in western Siberia; and together with Irtysh forms the world's seventh-longest river system, at . It forms at the confluence of the Biya and Katun which have their origins ...

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

Accident

Angara Airlines JSC Angara Airlines (russian: ЗАО «Авиакомпания «Ангара») is an airline based in Irkutsk, Russia. Overview Established in 2000, it operates on behalf of its owner, the Irkut Corporation aircraft repair factory out of Ir ...

flight IK9007 (reported also as flight SP5007) took off from

Bogashevo Airport Tomsk Bogashevo Airport (russian: Аэропорт Богашёво) is an airport that serves Tomsk, Russia. It is located approximately 20 km south-east of Tomsk city center, near the village Bogashevo in Tomsky District of Tomsk Oblast. ...

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, 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 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 (ASCPCs) valves bleed air from high or low stage engine compressor sections. Lo ...

supply was closed. The crew initiated a diversion to

Nizhnevartovsk Airport Nizhnevartovsk Airport (russian: Аэропорт Нижневартовск) is a major airport in Russia located 4 km northwest of Nizhnevartovsk Nizhnevartovsk ( rus, Нижневартовск, p=nʲɪʐnʲɪˈvartəfsk) is a city ...

, 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, 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 Kyiv, Irku ...

with

registration Register or registration may refer to: Arts entertainment, and media Music * Register (music), the relative "height" or range of a note, melody, part, instrument, etc. * ''Register'', a 2017 album by Travis Miller * Registration (organ), th ...

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 design bureau and manufactured thereafter by Motor Sich. It was designed to power Antonov's successful An-24, An-26 and An-30 aircraft se ...

turboprop engines.

Investigation

The

Interstate Aviation Committee The Interstate Aviation Committee (IAC; russian: Межгосударственный авиационный комитет, МАК) is an executive body of the Civil Aviation and Airspace Use Council of the Commonwealth of Independent States ( ...

(IAC/МАК) of the

Commonwealth of Independent States The Commonwealth of Independent States (CIS) is a regional intergovernmental organization in Eurasia. It was formed following the dissolution of the Soviet Union in 1991. It covers an area of and has an estimated population of 239,796,010. ...

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 as a "black box", an outdated name which has ...

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 as a "black box", an outdated name which has ...

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 2011 2011 disasters in Russia Accidents and incidents involving the Antonov An-24 Airliner accidents and incidents involving ditching Aviation accidents and incidents in Russia Airliner accidents and incidents caused by in-flight fires July 2011 events in Russia Airliner accidents and incidents caused by engine failure