Investigators believed that the mos

Investigators believed that the most likely sequence of events that led to the separation of the engine pylon was "(1) a fracture initiated by a fatigue crack of the shear face of the inboard midspar fuse pin," the report said, " ... followed by (2) a sequential failure of the outboard lug of the inboard midspar fitting. Then (3), the outboard shear face. Finally (4), the inboard shear face of the outboard midspar fuse pin. The subsequent pylon engine separation occurred during the flight out of Schiphol Airport at 6,500 feet and at an IAS [indicated airspeed] of 367 knots.