Aerodynamic forces acting on the wing resulted in an uncommanded retraction of the outboard slats. As the engine separated from the aircraft, it severed hydraulic lines that lock the wing's leading-edge slats in place and damaged a 3-foot (0.9 m) section of the left wing's leading edge. The National Transportation Safety Board (NTSB) found that as the aircraft was beginning its takeoff rotation, engine number one (the left engine) separated from the left wing, flipping over the top of the wing and landing on the runway. With 273 fatalities, it is the deadliest aviation accident to have occurred in the United States.

All 258 passengers and 13 crew on board were killed, along with two people on the ground. On the afternoon of May 25, 1979, the McDonnell Douglas DC-10-10 operating this flight was taking off from runway 32R at O'Hare when its left engine detached from the wing, causing a loss of control, and the aircraft crashed less than one mile (1.6 km) from the end of the runway. Loss of control caused by engine detachment and hydraulic failure, due to improper maintenance Ĥ2☀′35″N 87★5′45″W / 42.00972°N 87.92917°W / 42.00972 -87.92917 ( accident site) Īmerican Airlines Flight 191 was a regularly scheduled domestic passenger flight in the United States from O'Hare International Airport in Chicago, Illinois, to Los Angeles International Airport in California. Flight 191 after takeoff, missing its left engine, leaking fuel and hydraulic fluid

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