NTSB Identification: FTW84IA400.
The docket is stored on NTSB microfiche number 27043.
Incident occurred Saturday, September 15, 1984 in DFW AIRPORT, TX
Aircraft: McDonnell Douglas DC-10-10, registration: N124AA
Injuries: 3 Uninjured.

NTSB investigators used data provided by various sources and may not have traveled in support of this investigation to prepare this aircraft incident report.

THE ACFT EXPERIENCED SEPN OF THE RGT WING #3 LEADING EDGE SLAT WHILE DESCENDING FOR AN APCH. AN INVESTIGATION REVEALED THAT ON 7/5/84, THE COMPANY PERFORMED A 'C' CHECK INSPECTION OF THE ACFT. AT THIS TIME A RGT WING #3 LEADING EDGE SLAT RETRACT ALUMINUM PULLEY, P/N 1969-132, WAS REPLACED WITH A PHENOLIC PULLEY, P/N 1969-172. THE DC-10 PARTS ILLUSTRATED CATALOGUE SPECIFIES THAT AN ALUMINUM PULLEY BE INSTALLED ON THE #3 LEADING EDGE SLAT RATHER THAN THE PHENOLIC PULLEY BECAUSE FLT LOADS ON THE #3 SLAT EXCEEDED THE DESIGN LOAD OF THE PHENOLIC PULLEY. METALLURGICAL EXAMINATION OF THE FAILED PULLEY & CABLE INDICATED EVIDENCE OF AN OVERLOAD FAILURE. INSPECTION OF OTHER COMPANY DC-10'S REVEALED AT LEAST 3 OTHER ACFT HAD PHENOLIC PULLEYS INSTALLED IN THE #3 SLAT POSITION.

The National Transportation Safety Board determines the probable cause(s) of this incident to be:

FLIGHT CONTROL,SLAT ATTACHMENT..IMPROPER

The National Transportation Safety Board determines the probable cause(s) of this incident to be:

MAINTENANCE,INSTALLATION..IMPROPER..COMPANY MAINTENANCE PERSONNEL

The National Transportation Safety Board determines the probable cause(s) of this incident to be:

FLIGHT CONTROL,SLAT ATTACHMENT..FAILURE,TOTAL

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