« Reply #44 on: November 20, 2025, 12:31:51 pm »
The left pylon aft mount's forward and aft lugs were both found fractured near their 2 o'clock (inboard fracture) and 9 o'clock (outboard fracture) positions when in the aft-looking-forward frame of reference (see figure 7). The fractured and separated upper portions of the forward and aft lugs were found adjacent to runway 17R. The left wing clevis, aft mount spherical bearing, and aft mount attachment hardware were found with a portion of the left wing at the accident site. The bolt, spherical bearing, and associated hardware remained attached to the wing clevis. The spherical bearing outer race had fractured circumferentially, exposing the ball element (see figure 8).
(snip)
After initial cleaning of the fracture surfaces, examination of the left pylon aft mount lug fractures found evidence of fatigue cracks in addition to areas of overstress failure. On the aft lug, on both the inboard and outboard fracture surfaces, a fatigue crack was observed where the aft lug bore met the aft lug forward face. For the forward lug's inboard fracture surface, fatigue cracks were observed along the lug bore. For the forward lug's outboard fracture surface, the fracture consisted entirely of overstress with no indications of fatigue cracking. The forward top flange of the aft mount assembly was examined for indications of deformation or pre-existing fractures, but no indications were found. The spherical bearing was removed from the wing clevis for further evaluation
Metal fatigue in the left engine pylon.

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