American Airlines 191
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aircraft. The No. 1 and No. 3 hydraulic system's extension and retraction lines and the followup cables for the left' wing's outboard slat drive actuators were severed. Thirty-five of the 36 leading edge slat tracks were examined.. The examination disclosedOpen official document at PDF page 15NTSB AAR-79/17: American Airlines DC-10-10 N110AA, Chicago