The hole on the right side of UAL 811, Boeing 747 when cargo door popped open and was torn away. This is the hole the 300 knot wind enters and tears nose off.

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Boeing 747 nose picts right side cargo door
811 picture
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AD Airworthiness Directive 79-17-02
Airworthiness Directive Amendment to 89-05-54 amending 88-12-04
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Airworthiness Directive 88-12-04 Boeing 747
More pictures of UAL 811 cargo door hole
Cargo door accidents