规定了用于评估窄轨拖拉机驾驶员座椅前部防滚翻保护结构的试验程序和最低性能标准。它适用于驾驶员控制的拖拉机，但不包括土方设备。它包括动态和静态测试程序。包括翻滚保护结构的理论分析，该结构将提供与物理测试同等的性能。

Specifies test procedures and minimum performance criteria for evaluating roll-over protective structures mounted in front of the driver's seat on narrow-track tractors. It applies to driver-controlled tractors, but does not cover earthmoving equipment. It includes procedures for both dynamic and static testing. A theoretical analysis of roll-over protective structures, which would provide equivalent performance to physical testing, is included.