You can view hidden or hard to see damage on the aircraft fuselage skin. For example, lighting strikes on skin edges or fasteners, scratches in the skin or upper clad layer, rivet heads sanded flush, scribe lines.
Additionally, there may be mandatory or scheduled inspections that are also required such as AD (Airworthiness Directives) to inspect lap joints for scribe lines. (scribe lines are where a sharp point like a knife is used to remove paint, decals or sealant and damages the fuselage structure; if found the potential repair can be vast)”
By – Esat ÖZTÜRK (Licenced Aircraft Maintenance Engineer B1 )
