PA 23-250 NG Upper Trunnion Assy. PN#31768-003 By JT Evans | September 27, 2013 - 12:28 pm |September 27, 2013 Inquiry, Sales - Piper Parts Click Image to Enlarge: Tagged 31768-003, Nose Gear Trunnion, PA 23-250, Trunnion. Bookmark the permalink.