The valve from this tank to the central oil pump did not close completely, causing a large amount of water to enter the other tanks during pressurization, a violation that nearly killed the crew.Īccording to Circular No. Fortunately, no one was injured, but the helicopter could only remain at the accident site.Ī careful examination of the helicopter wreckage by the accident investigation committee found that fuel and lubricant workers at Tarko-Sale airfield had pumped water to pressure test a fuel tank without notifying crew members.

Due to the large landing speed, the Mi-6 was severely damaged. The pilot had to make an emergency landing in a swamp about 60 kilometers southeast of the airport. Unexpectedly, 5 minutes after takeoff, both engines failed, and the flight altitude was 150 meters. On August 8, 1981, after the Mi-6 helicopter was refueled at Tarko-Sale Airport in Tyumen Region, the lifting material took off to prepare for the delivery of supplies for the oil exploration team.

It was put into operation from January 1964 to August 1981 and had been flying safely for 17 years when the accident occurred. The Mi-6 helicopter, with the fuselage number CCCP-21899, rolled off the production line at the Soviet Union's 168th Plant (now the Russian Rostov Helicopter Union 'Rostvertol') on October 14, 1963.

What is cccp on heli