Cover illustrates the issue's lead story.
This story predates the cover drawn to illustrate it by over a dozen years. Spring 1957 and fall 1970, respectively. Both are reprints to this 1981 issue.
One of the stories referred to collectively as "The Brittle Mastery of Donald Duck", a series of stories by Carl Barks where Donald is the-best-there-is at something... until he's not, usually involving some disaster.