John Schmidt submitted this photo and note: “Commemorative Air Force members Ron Bombeck, crew chief Dan Bombeck, and pilot Jeff Knutson inspect the Pratt and Whitney R-985 on the nose of the Minnesota Wing’s Oshkosh-award-winning BT-13 in the hangar at South St. Paul Airport (KSGS). Winter maintenance has begun, and it’s an excellent time to see the warbirds, with inspection panels off, as crews of volunteers prepare the airplanes for another air show season.”
Source: general aviationPicture of the Day: Winter maintenance