Related Objects of Interest: add-on;dynotail;ok , add-on;lps;ok , add-on;lps;worn or burnt , add-on;markings;cog , add-on;markings;lifting point , add-on;markings;text , add-on;serration;ok , leading edge;erosion;coating or lep only , surface;contamination;dirt , leading edge;erosion;continuous or deep