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'Real Housewives of NY' star Carole Radziwill's boyfriend is recovering after he was lucky enough to walk away from a small plane crash.

Adam Kenworthy and his 65-year-old dad -- who was flying the plane -- made a crash landing Thursday in Iowa. Law enforcement tells TMZ ... Adam's father reported engine problems shortly before the plane went down on a hillside.

Carole tells TMZ Adam was released from the hospital a few hours after the crash, and his mom says he suffered a few abrasions but will be fine.

Adam posted a video to his Instagram Thursday from what we're guessing is the same plane that went down later in the day.