Use of horizontal members of the end frames of metal scaffolds as safe access.

OSHA interpretation letter responding to a query on 29 CFR 1910.29(a)(3)(viii) and 1910.28(a)(12). It states that end-frame horizontal members may serve as access if manufacturer-designed as ladder access, with rung spacing not exceeding 12 inches and uniform, and treats 13.75-inch spacing as a de minimis violation.