English: An illustration of the wing root of the Martin 2-0-2 aircraft operating as Northwest Orient Airlines Flight 421 that crashed on 29 August 1948 due to structural failure of the wings.
From image description: "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'."
{{Information |Description={{en|1=An illustration of the wing root of the Martin 2-0-2 aircraft operating as Northwest Orient Airlines Flight 421 that crashed on 29 August 1948 due to structural failure of the wings. From image description: "Schematic se
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