Did you read the article?  He didn't land initially. He did further investigation. And for all any of us know he followed the exact procedures set forth by Beechcraft, the FAA and his company.  The most important thing is that he handled the situation in a way where everybody walked away without injury. How do you know there was any flight deck indication?  Sometimes you DO feel things that aren't right and you make decisions based on experience. Just because you've never heard of something doesn't mean it doesn't actually happen.