The Plane That Should NOT Have Been Flying | The Crash Of Sunway Airlines Flight 4412
Uploader: Mini Air Crash Investigation
Original upload date: Wed, 25 Nov 2020 00:00:00 GMT
Archive date: Sun, 28 Nov 2021 16:59:11 GMT
IL76 Image: Alan Lebeda
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This is the story of Sunway airlines flight 4412. The Il76 i
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s a soviet workhorse and to this day it is used in militaries around the world and as a cargo plane. Ive said it before and Ill say it again the soviet union knows made some beautiful planes and the IL76 Is no exception. This particular IL76, was owned and operated by Sunway, a georgian airline, Georgia the country not the state. The plane flew from the UAE to Jinnah international airport in karachi, pakistan on the 27th of november 2010 at 10 am UTC carrying a boeing 747 enigne. The next day that is the 28th of november the plane was being prepped for take off, Today the plane would be hauling relief materials to khartoum international airports in sudan and so the plane was loaded up with tons and tons of tents. Between 8 21 and 8 24 pm UTC the 4 engines roared to life.
After the crew were satisfied with the way their engines were running they extended the flaps and slats to their take off positions. The plane was good to go, the crew did have some trouble starting engine number 4 on a few previous flights, but not today. At 8:43 and 53 seconds the plane started down runway 25 L of karachi's Jinnah international airport and the plane was airborne. As the plane climbed away it started a slight left bank, The crew checked in with ATC “1255, good day MGC22..” their transmission was cut short. On board a crisis was developing the high pressure compressor in the number 4 engine was shutting down, the crew also had a fire warning on engine number 4. The plane was now 1.24 miles away from the runway and it was at 328 feet in altitude.
A few seconds after engine number 4 failed the plane started to bank right, The pilots were commanding a left roll with the ailerons and the spoilers, but the right bank persisted. In a few seconds the plane was banked to the right by 14 degrees. Engine number 4 was now idling. But the plane continued to bank, now at 32 degrees of bank, the IL76 reached an altitude of 500 feet and it began to descend. As it descended the bank grew worse now at 70 degrees to the right. At this point the plane was unrecoverable and it crashed into housing being built for the pakistani navy near karachi airport. 8 people on board and 4 people on the ground did not make it.
Looking at the wreckage of the plane it was clear that the plane hit the ground in a hard right bank. The wreckage also told them that the there were not flight control issues with the plane as the flight control linkages were all still intact even after the crash, but as they soon discovered not all of the plane was there at the crash site, along the flight path from runway 25L and the crash site they found the shattered battered innards of an IL-76 engine, Engine number 4 had failed as the plane took off from karachi. Parts like shafts, compressor blades and cowlings had fallen off the plane as it tried to climb out. Finding out what happened to Engine number 4 might hold the clue to what happened to sunway flight 4412.
They found that the Low pressure compressor stage disk was the first part to fail, and when that part failed it damaged the right wing of the plane. The damage punctured a fuel tank and that started an inflight fire. The flaps on the right wing of the plane also sustained damage. However the Low pressure second stage disk was lost during the investigation so they couldn't test it extensively to figure out how it failed.