Accident Board Findings

The NTSB determined that the probable cause of this accident was "...the asymmetrical stall and the ensuing roll of the aircraft because of the uncommanded retraction of the left wing outboard leading edge slats and the loss of stall warning and slat disagreement indication systems." This resulted from maintenance-induced damage leading to the separation of the number 1 engine and pylon assembly at a critical point during takeoff. The separation resulted from damage by improper maintenance procedures, which led to failure of the pylon structure.

The NTSB issued 23 findings regarding this accident. The findings dealt variously with the:

  • Separation of the engine pylon from the wing

  • Loss of electrical and hydraulic power to flight controls

  • Flight crew procedures

  • Performance of improper maintenance procedures

  • Lack of redundancy in the stall warning system

  • Lack of mechanical locks in the high lift system

Select this link to view the detailed NTSB findings. Select this link to view the entire NTSB report.

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