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Keywords: Martin202-wing root fittings.jpg Schematic section of separation of lower flange showing fatigue area and also sudden increase of depth of flange 'a' to approximately twice the depth as indicated by 'b' Civil Aeronautics Board Accident Investigation Report Northwest Airlines Inc Winona Minnesota August 29 1948 http //dotlibrary specialcollection net/ Civil Aeronautics Board US Government 1949-06-29 PD-USGov Northwest Orient Airlines Flight 421 |