What happened
N101AA, operating as American Airlines Flight 192, was initially cleared to land on Runway 21R at Chicago O'Hare International Airport. However, due to a reported landing gear problem with a preceding aircraft, air traffic control redirected Flight 192 to use Runway 21C instead. The first officer, who was piloting the aircraft during the approach, executed a side-step maneuver to align with the new runway.
The aircraft touched down significantly beyond the ideal touchdown zone on the 8,500-foot runway. According to post-accident data, the plane had approximately 5,037 feet of runway remaining at the moment of contact. The flight crew reported that operations appeared normal during the initial rollout phase. However, once the aircraft's speed dropped below 80 knots, it failed to decelerate as expected.
Despite the crew's efforts to utilize both wheel brakes and reverse thrust, they were unable to bring the aircraft to a stop within the available runway length. The aircraft overran the end of the paved surface.
The investigation
Investigative analysis focused on the aircraft's performance capabilities relative to the runway conditions at the time of the accident. Data obtained during the inquiry indicated that the runway surface was icy. Reference to the aircraft's official performance handbook revealed that the required stopping distance for an MD-83 series aircraft on an icy runway would exceed 5,100 feet.
Given that only 5,037 feet were available after touchdown, the physical constraints of the environment made a safe stop impossible. The discrepancy between the available runway length and the necessary stopping distance under those specific weather conditions was the primary mechanical factor identified.