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From the pylon but leaving the pylon attached to the wing. at the time, engineers from several airlines were using a shortcut. they found if the pylon and engine were removed in one piece, they could change the engine more quickly. >> they just dropped the entire unit from the wing. changed the component and put it all back together. in theory it sounded great, on paper it looked good. >> it's when maintenance workers are reattaching the engine and pylon eight weeks before the crash the soon to be fatal mistake is made. if the airline had followed manufacturer requirements, workers would have ...

Went right into the ground. everything in its path was blown into a sheet of flame. >> initially, ntsb investigators are baffled what could have caused a failure of this magnitude. >> this is all that's left of american airlines flight 191, as far as it got on its way to los angeles. >> they sift through the wreckage and look to the plane's two flight recorders for clues. within days of the crash, it began to zero in on a part called the pylon. it has a 13-inch crack they believe was caused by fatigue prior to the crash, which maintenance inspections had missed. what exactly is a pylon? aviati...

They could change the component, put it all back together. in theory it sounded great, on paper it looked good. >> it's when maintenance workers are reattaching the engine and the soon to be fatal mistake is made. if the airline had followed manufacturer requirements, workers would have simply reattached the engine to the pylon using a specialized machine, recommended by the manufacturer. but because they've removed the massive engine/pylon assembly together, now it has to be replaced as one unit. using a forklift, workers inadvertently crack the top section of the pylon called the flange as t...

Angeles. >> they sift through the wreckage and look to the plane's two flight recorders for clues. within days of the crash, it began to zero in on a part called the pylon. it has a 13-inch crack they believe was caused by fatigue prior to the crash, which maintenance inspections had missed. what exactly is a pylon? aviation consultant john cox showed us at evergreen international, an airplane maintenance and storage facility outside tucson, arizona. >> you can see the pylon assembly, on which the engine rests on the pylon and it's attached to the wing. >> it looks like an arm that the engine ...

Crash that the soon-to-be fatal mistake is made. if the airline had followed manufacturer requirements, workers would have simply reattached the engine to the pylon using a specialized machine, recommended by the manufacturer. but because they've removed the massive engine/pylon assembly together, now it has to be replaced as one unit. using a forklift, workers inadvertently crack the top section of the pylon called the flange as they try to fit the assembly back on to the plane. >> because they were using a forklift to try to hold this heavy engine up while they put these two big bolts in pla...