1.1 本规范涵盖越野摩托车和全地形车（ATV）骑手使用的头盔的性能要求。 1.2 符合联邦规定的第218号FMVSS应作为符合本ASTM标准的一部分进行记录。 1.3 本规范提供了额外的性能要求，包括全面部覆盖头盔（如果头盔配备下巴杆）下巴杆的位置稳定性和性能标准。 1.4 本标准不要求头盔提供完整的面部覆盖。 1.5 这是一项性能规范，无意限制设计。 1.6 本规范的所有测试和要求应符合测试方法 F1446 ，除非另有说明。 1.7 禁止部分使用本标准。任何符合本规范的声明都必须证明产品完全符合本规范的所有要求。 不符合本规范任何一项要求的产品被视为不符合本标准，销售时不得有任何迹象表明其符合本标准的部分要求。 1.8 设计符合本标准和其他标准的头饰可经制造商认证后使用。 1.9 以国际单位制表示的数值应视为标准值。本标准不包括其他计量单位。 1.10 以下安全警告适用于本文所述的化学、机械或物理或其组合的测试方法，并专门针对执行测试的人员（旨在向他们提供在进行测试时采取适当预防措施的通知）: 本标准并非旨在解决与其使用相关的所有安全问题（如有）。 本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.11 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。

1.1 This specification covers performance requirements for helmets used by off-road motorcycle and All-Terrain Vehicle (ATV) riders. 1.2 Compliance with the federally mandated FMVSS No. 218 shall be documented as part of compliance with this ASTM standard. 1.3 This specification provides additional performance requirements including positional stability and performance criteria for chin bars on full-facial coverage helmets if the helmet is equipped with a chin bar. 1.4 This standard does not require that helmets provide full facial coverage. 1.5 This is a performance specification and is not intended to restrict design. 1.6 All testing and requirements of this specification shall be in accordance with Test Methods F1446 , except where noted herein. 1.7 Partial utilization of this standard is prohibited. Any statement of compliance with this specification must be a certification that the product meets all of the requirements of this specification in its entirety. A product that fails to meet any one of the requirements of this specification is considered to have failed this standard, and should not be sold with any indication that it meets parts of this standard. 1.8 Headgear designed to comply with this and other standards may proclaim uses as certified by the manufacturer. 1.9 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.10 The following safety caveat applies to the chemical, mechanical, or physical, or a combination thereof, test methods described herein and is meant specifically for those performing the tests (in an effort to provide them with notice to take the appropriate precautions when conducting the tests): This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.11 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.