The third JT8D engine , which is located at the end of the fuselage , or body of the plane ( called engine 2 ) , gets air from an opening at the front of the tail of the plane from an S-shaped duct that brings the air to the opening of the engine . The middle engine ( engine 2 ) at the very rear of the fuselage gets air from an inlet ahead of the vertical fin through an S-shaped duct .