Originally Posted by
LTC8K6
IIRC, we can see in some crash photos that there is very little or no fan tip damage. The damage which stopped the engines was perhaps gear box or fuel or oil line damage.
Repeating myself here, but not wanting to force people to read (or re-read) all 60+ pages:
There is a picture posted (many pages back) of the CFM56-5 gearbox installation - at the six o'clock position on the fan case. Given the force of the cowling impacts on the runway, it's highly likely the gearbox casing fractured (it's a large casting, so relatively brittle in impact). This would have resulting in a very rapid loss of nearly all the engine oil. The gearbox apparently didn't fail catastrophically - that would have failed the engine driven fuel pump which would have caused the engine to quit almost immediately.