NTSB Identification: MKC85IA131.
The docket is stored on NTSB microfiche number 28307.
Scheduled 14 CFR TRANS WORLD AIRWAYS
Incident occurred Tuesday, June 11, 1985 in ST. LOUIS, MO
Aircraft: LOCKHEED L-1011, registration: N31013
Injuries: 219 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.

WHILE ON AN IFR APPROACH TO LAND AT STL AND THE PLT INITIATED FLAPS. THE NO.3 OUTBOARD FLAP VANE SEPARATED FROM ITS MOUNTING AND FELL TO THE GROUND. UPON SEPARATION THE FLAP VANE STRUCK THE LEADING EDGE OF THE TRAILING EDGE FLAP KNOCKING A HOLE IN THE SKIN. THE SUBSEQUENT LANDING WAS UNEVENTFUL. EXAMINATION OF THE FLAP VANE ATTACH FITTING REVEALED IT FAILED IN FATIGUE FOLLOWED BY AN OVERLOAD SEPARATION. THERE HAVE BEEN 14 RECORDED CASES OF FAILURE OF THE FLAP VANE ATTACH FITTINGS WITH 9 REPORTED SEPARATIONS FROM THE AIRCRAFT.

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

FLIGHT CONTROL,FLAP ATTACHMENT..FATIGUE

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

FLIGHT CONTROL,FLAP ATTACHMENT..SEPARATION

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