1.1 本规范解决了小型飞机设计中与结构耐久性相关的适航要求。该材料是通过国际通用航空专家的公开共识开发的。该信息是通过关注1级到4级普通类别飞机创建的。所述内容可以更广泛地适用；申请人有责任证明更广泛的适用性作为一种特定的遵守手段。 1.2 申请人有意提供此信息作为设计批准的合规手段，必须寻求其各自监督机构的指导（例如，适用民航当局（CAA）公布的指导，包括中提到的指导 附录X2 指导材料）关于其可接受的用途和应用。有关监督机构已接受本规范（全部或部分）作为符合其法规要求（以下简称“规则”）的可接受手段的信息，请参考ASTM Committee F44网页（www.astm.org/Committee/F44.htm）。 附件A1 将符合ASTM标准的方法映射到EASA CS-23，修正案5或更高版本，以及FAA 14 CFR 23，修正案64或更高版本，23.2240的结构耐久性要求。 1.3 单位— 本文件可以以国际单位制单位、英文工程单位或两者兼而有之呈现信息；每个系统中陈述的值不一定是精确等价的；因此，为确保符合标准，每个系统应独立使用，两个系统的值不得合并使用。1.4 本标准无意解决与其使用相关的所有安全问题（如果有的话）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践，并确定法规限制的适用性。 1.5 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。

1.1 This specification addresses the airworthiness requirements related to structural durability for the design of small aeroplanes. The material was developed through open consensus of international experts in general aviation. This information was created by focusing on Levels 1 through 4 Normal Category aeroplanes. The content may be more broadly applicable; it is the responsibility of the applicant to substantiate broader applicability as a specific means of compliance. 1.2 An applicant intending to propose this information as Means of Compliance for a design approval must seek guidance from their respective oversight authority (for example, published guidance from applicable Civil Aviation Authorities (CAAs), including the guidance noted in Appendix X2 , Guidance Material) concerning the acceptable use and application thereof. For information on which oversight authorities have accepted this specification (in whole or in part) as an acceptable Means of Compliance to their regulatory requirements (hereinafter referred to as “the Rules”), refer to ASTM Committee F44 webpage (www.astm.org/COMMITTEE/F44.htm). Annex A1 maps the Means of Compliance of the ASTM standards to EASA CS-23, amendment 5, or later, and FAA 14 CFR 23, amendment 64, or later, Structural Durability requirements of 23.2240. 1.3 Units— This document may present information in either SI units, English Engineering units, or both; the values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined. 1.4 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. 1.5 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.