PARTIAL FAILURE OF A WING RIB DUE TO EXFOLIATION CORROSION AND INADEQUATE INSPECTION OF THE AIRCRAFT BY COMPANY MAINTENANCE PERSONNEL.
— NTSB Determination
AFTER AN UNEVENTFUL LANDING WHILE TAXIING, THE CAPTAIN NOTICED THAT A SECTION OF THE LEFT WING WAS BENT UP. EXAMINATION OF THE AIRPLANE REVEALED THAT RIB NO. 19 IN THE LEFT WING FAILED CHORDWISE MIDPOINT BETWEEN A ROW OF RIVETS AND NUTPLATES ON THE LOWER ATTACH ANGLE DUE TO EXFOLIATION CORROSION. THE FAA APPROVED 50-HOUR INSPECTION REQUIRES VISUAL INSPECTION OF THE ATTACH ANGLE AND BOLTS BUT DOES NOT REQUIRE REMOVAL OF THE WING TIP.
AFTER AN UNEVENTFUL LANDING WHILE TAXIING, THE CAPTAIN NOTICED THAT A SECTION OF THE LEFT WING WAS BENT UP. EXAMINATION OF THE AIRPLANE REVEALED THAT RIB NO. 19 IN THE LEFT WING FAILED CHORDWISE MIDPOINT BETWEEN A ROW OF RIVETS AND NUTPLATES ON THE LOWER ATTACH ANGLE DUE TO EXFOLIATION CORROSION. THE FAA APPROVED…
The accident on 1993-10-07 involved a Douglas DC-3C, registration N781T, at San Juan, PR.
PARTIAL FAILURE OF A WING RIB DUE TO EXFOLIATION CORROSION AND INADEQUATE INSPECTION OF THE AIRCRAFT BY COMPANY MAINTENANCE PERSONNEL.
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