WINGS. (Refer to figure 4-1.) 4-3. DESCRIPTION. Each all-metal wing is a semicantilever, semimonocoque type, with two main spars and suitable ribs for the attachment of the skin. Skin panels are riveted to ribs, spars and stringers to com plete the structure. An all-metal, piano-hinged ail- eron, flap and a detachable wing tip are mounted on each wing assembly. Asingle metal fuel tank is moun- ted between the wing spars at the inboard end of each wing. The leading edge of the left wing may be equipped with landing and taxi lights (thru 1970 Models) Colored navigation lights are mounted at each wing tip.