This specification has been declared "NONCURRENT" by the Aerospace Materials Division, SAE, as of February, 2005. It is recommended, therefore, that this specification not be specified for new designs. "NONCURRENT" refers to those specifications which have previously been widely used and which may be required on some existing designs in the future. The Aerospace Materials Division, however, does not recommend these specifications for future use in new designs. This specification covers an alclad aluminum alloy in the form of sheet and plate. These products have been used typically for formed structural parts which will be subsequently heat treated and which are required to exhibit maximum corrosion resistance, but usage is not limited to such applications.