本SAE推荐规程确立了实现预期目的所需的试验程序和最低性能标准，适用于集材机、抓斗集材机和履带式集材机（用于树木采伐）。在所有可能的情况下，满足这些性能标准的结构可能不会为操作员提供完整的保护，但在合理的操作情况下，它们有望将操作员受伤的可能性降至最低。本文件中的性能要求和测试标准源自对在各种实际操作条件下执行预期功能的操作员保护的调查。本文件旨在建立一种一致的、可重复的方法，用于评估集材机、抓斗集材机和履带上用于树木采伐的操作员保护结构（OPS）。 操作员保护结构是一种结构/外壳，其主要目的是最大限度地减少操作员因鞭打树苗、树枝、刺伤（矛状物体）和折断绞车缆绳等危险而受伤的可能性，对操作员的能见度、舒适度和其他危险的保护产生的不利影响最小。

This SAE Recommended Practice establishes the test procedures and minimum performance criteria necessary to fulfill the intended purpose and is applicable to Skidders, Grapple Skidders, and Crawlers when used in the harvesting of trees.Structures meeting these performance criteria may not provide complete operator protection under all conceivable circumstances, but they are expected to minimize the possibility of operator injury under reasonable operating situations.The performance requirements and test criteria included in this document are derived from investigations on operator protection that has performed the intended function in a variety of actual operating conditions.This document is intended to establish a consistent, repeatable means of evaluating Operator Protective Structures (OPS) on skidders, Grapple Skidders, and Crawlers when used in the harvesting of trees. Operator Protective Structures are structures/enclosures whose primary purpose is to minimize the possibility of operator injury from hazards such as whipping saplings, branches, jill-poking (spear-like objects), and snapping winch lines with the least adverse effect on operator visibility, comfort, and protection from other hazards.