Most people think of planes as a fast and efficient way to get to a place farther away than what a car can take them. But, what most people don’t know is that there are engineering design problems. One of which happened to Aeroflot Flight 8641.
In June 28, 1981, AeroFlot Flight 8641 encountered an engineering design problem. Unfortunately, it ended horribly and the crash killed everyone on board which was a total of 132 people. The plane crashed near Mozyr, Belarus. This opened the people’s eyes about the Yak-42s. All Yak-42s were suspended from service until the design defect was solved and tested.
Yakovlev is a plane company out of Russia.In 1965, Yakovlev built the Yak-40. Then in the early 1970s the Yak-42 was designed and built. The designers are working on a new plane design called the Yak-44. The Yak-42 is a medium size jet airliner. AeroFlot Flight 8641 was the first crash with this plane because of the design failure. This crash was the first and deadliest crash including the Yak-42. No one knew about the design defect until the investigation on why the plane lost control and crashed.[1]
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During the investigation, it was found that the whole tail of the plane detached due to metal fatigue on the jackscrew. [3]The metal on the jackscrew was melted, which made it deform and cause a weak spot in the tail. The pressure of the air and speed of the plane started cracking and breaking the tail off, which cause the plane to dive down to the ground and crashed killing everyone on board.
The designers were a group from the company, Yakovlev. They were blamed for the crash because they didn’t take precautions on metal fatigue issue in the prototypes[4]. After the crash, the designers had to fix the problem before sending any more planes up into the air. So, the designers had to find a way to stop metal fatigue.
New precautions were put into place on how to keep the jack screw from melting.[6] The designers needed to know parts of structural engineering, mechanical engineering, and material science.[7] They needed to know how to keep the stress below the fatigue level and also, needed to know how to make the plane efficient when one part fails the whole plan does not fail.[8] They also had a part life[9]. This is when a part got used to a certain amount of time it got replaced with a new one. And lastly, the plane was checked for cracks and when a crack gets to a certain length the part is replaced.
The jackscrew is made out of cast iron. This cast iron’s melting point is 2060-2200 degrees fahrenheit or 1127-1204 degrees celsius. The solution of the new design is how to divert the heat from the jackscrew or change the material of the jackscrew or the materials around it to keep the jackscrew cooled of[10]f.
The design of the Yakovlev Yak-42 was the cause of the crash. The designers had to make a new design to solve the problem that happened to AeroFlot Flight 8641. There were also new precautions put into place to prevent crashes or issues with the plane. New part lifes were also introduced to keep the planes running for longer and to keep old parts off the plane to cut off the chance of it failing and causing a crash.
https://en.wikipedia.org/wiki/Jackscrew
https://en.wikipedia.org/wiki/Fatigue_(material)
https://www.revolvy.com/main/index.php?s=Aeroflot%20Flight%208641
https://en.wikipedia.org/wiki/Aeroflot_Flight_8641
http://www.theinfolist.com/php/SummaryGet.php?FindGo=Yakovlev%20Yak-42
http://www.airvectors.net/avyak40.html
Aeroflot flight 8641
Jackscrew
https://en.wikipedia.org/wiki/Jackscrew
Metal fatigue
https://en.wikipedia.org/wiki/Fatigue_(material)
https://www.revolvy.com/main/index.php?s=Aeroflot%20Flight%208641
Jackscrew mechanism in the aircraft’s tail
The aircraft lost control and dove into the ground
https://en.wikipedia.org/wiki/Aeroflot_Flight_8641
Killed all 132 people on board
When
June 28, 1982
Where
Near Mozyr, Belarus
How
Jackscrew mechanism in the aircraft’s tail
What happened after
All yak-42s were shut down until the problem as fixed
Yakovlev Yak-42
The tailplane detached from the plane
http://www.theinfolist.com/php/SummaryGet.php?FindGo=Yakovlev%20Yak-42
Rubric rating submitted on: 12/21/2016, 11:56:36 AM by stephanie.russell@bryanisd.org
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Rubric rating submitted on: 12/21/2016, 12:14:40 PM by stephanie.russell@bryanisd.org
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