AMS4278C Aluminum Alloy, Alclad Sheet 5.6Zn - 2.5Mg - 1.6Cu - 0.23Cr (Alclad 7075-O) Annealed, Fine Grained

AMS4278C is the result of a Five-Year Review and update of this specification with changes to prohibit unauthorized exceptions (see 3.3.1.2.1, 3.6, 4.4.1, 5.1.1, and 8.4), add provisions for the use of AS6279 (see 3.7), update Title to reflect -O temper, Scope (see 1.1) to align nominal thickness range with tables in Section 3, relocate Definitions (see 2.4), update Applicable Documents (see 2 and 3.3.2) and Ordering Information (see 8.6), renumber Cladding Thickness (see 3.3.3) for clarity, and allow the use of the immediate prior specification revision (see 8.5).