Ground loops can damage the undercarriage and wingtips of an aircraft. Several extreme incidents of ground loop have resulted in fatalities.

In the case of the 1947 crash of Pan Am Flight 121, Captain Michael Graham, one of the surviving passengers, said that the landing would have been successful had an engine on the port wing not dug into the ground, dragging the plane in that direction in a ground loop and breaking it in two.

Ground loops may occur

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