Copper alloy casting, qq-c-390, alloy d4, type 1 or 2, conditionas cast, 19.970 in o.D, 0.562 in thk, 3 tapped through holes equallyspaced on 19.250 in bolt circle, 12 drilled through holes, 24 degapart on 19.250 in bolt circle, penetrant inspect in accordancewith mil-i-6866, type 1, method-a