GOODWAY, AL, USA
N6941Z
PIPER PA-25-235
DURING AN AERIAL APPLICATION FLIGHT, THE LEFT WING SEPARATED AND THE AIRCRAFT HIT THE TOP OF A HOUSE. EXAMINATION OF THE WING REVEALED A FATIGUE FRACTURE IN THE WING'S LOWER SPAR CAP. METALLURGICAL EXAMINATION OF THE FRACTURE REVEALED THAT IT ORIGINATED ON OPPOSITE SIDES OF A RIVET HOLE. INTERGRANULAR CORROSION WAS FOUND AT ONE OF THE HIGH CYCLE FATIGUE FRACTURE ORIGINS. THE OPPOSITE FRACTURE ORIGIN HAD BEEN MECHANICALLY MUTILATED. IN AUG 1977, ALL-METAL WINGS WERE INSTALLED ON THE AIRPLANE PER A SUPPLEMENTAL TYPE CERTIFICATE.
THE IN-FLIGHT SEPARATION OF THE LEFT WING WHICH FAILED BECAUSE OF A CORROSION INDUCED FATIGUE FRACTURE.
Source: NTSB Aviation Accident Database
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