An upper stair landing frames into an MC12 channel stringer sized per plan, utilizing a C4 channel stiffener and a quarter-inch thick connection plate secured with a three-quarter-inch machine bolt and three-sixteenth-inch fillet welds. A lower alternate stair landing connection to MC12 channel stringers is framed with a quarter-inch thick plate fastened by three three-quarter-inch diameter machine bolts and three-sixteenth-inch fillet welds.
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