Ditching: Angara Airlines Flight 9007

Eleven years ago this week, an Antonov An-24 aircraft, registration RA-47302 and operated by Angara Airlines, made an emergency landing in the Ob River in Russia. The aircraft was on domestic passenger service from Tomsk Bogashevo Airport (TOF) to Surgut International Airport (SGC) in Russia. Let’s take a closer look at why the plane crashed into the Ob River.

The flight

On July 11, 2011, Angara Airlines flight number 9007 took off from Bogashevo Airport (TOF) located in the Russian region of Tomsk, just 19 km (11.8 miles) east of Nizhnekamsk, in the Tatarstan. The Antonov plane left TOF at 10:10 a.m. local time and began its two-hour, 15-minute journey to Surgut International Airport located in the Khanty-Mansi Autonomous Region about 544 miles to the northwest. of TOF. There were a total of 37 people on board, including 33 passengers and four crew members.

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Just over 90 minutes into the trip, Flight 9007 was cruising at an altitude of 6,000 meters (19,700 feet) when the flight engineer reported that the metal shavings in engine oil light went out. was on for engine number one. . Noting the anomaly, the captain ordered the mechanic to closely monitor all the parameters of engine one (left or port engine) and continued the flight.

Approximately eight minutes later, strong burning odors were detected in the cockpit, prompting the flight crew to reduce power on the affected engine and close the air bleed valve. At the same time, the co-pilot asked the controller for a diversion to the neighboring Nizhnevartovsk aerodrome. The controller approved the request at 11:45 a.m. and ordered Flight 9007 to descend to 4,800 meters (15,700 ft).

As the crew began to descend, the oil pressure in Engine 1 also began to drop at an alarming rate. The flight engineer issued verbal alerts to the captain, but the pilot decided not to shut down the engine. At 11:52 a.m., the aircraft was experiencing severe vibration while descending from 3,600 meters (11,800 ft). The crew looked out the cockpit side window and noticed that the left engine was on fire. Eventually the engine was cut, but it was too little too late for the pilots of Flight 9007.

The plane was nearly 80 km (50 miles) from the alternate airport and the crew had no choice but to make an emergency landing. They chose to abandon the 36-year-old Antonov An-24 in the Ob River, where it was badly damaged after hitting the shallow river bed.

Final report

The Russian Interstate Aviation Committee (MAK) began investigating the incident and published a detailed report of its findings in December 2013. Seven of the 37 people on board lost their lives, while 19 others died. been injured.

In its report, MAK noted that the engine malfunction may have developed due to the depressurization of the ventilation system caused by the “destruction of the centrifugal breather”. MAK notes that the captain’s reluctance to shut down the faulty engine, the crew’s late detection of the fire, and the failure to take timely action to extinguish the fire were the main contributing factors to the accident. from Angara Airlines. flight 9007.