Sr2 Ece R66 Bus Skin -

A corroded skin loses 50% of its tensile strength. For SR2 compliance, all cut edges must be sealed with zinc-rich primer. Between the skin and the frame, use a non-conductive barrier tape if mixing metals (steel frame, aluminum skin) to prevent galvanic corrosion.

The skin-to-frame connection must be dual-resistant (shear and peel).

Historically, bus skins were considered "non-structural." They were thin aluminum or mild steel sheets riveted or welded to a frame. They kept out rain and looked pretty. In an SR2 ECE R66 design, the skin is a stressed member. sr2 ece r66 bus skin