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'Real Housewives of New York' star Carole Radziwill's boyfriend stayed calm and collected after surviving a plane crash ... and even made the 911 call.

Adam Kenworthy and his dad crash-landed in a two-person plane in Iowa last week, and in the call -- obtained by TMZ -- Kenworthy says his knee is in bad shape. However, you can hear Adam's 65-year-old dad in a lot of pain ... as Adam does his best to keep him calm.