1.1 本规范涵盖了“小型”飞机适航和设计的环境系统方面的国际标准。 1.2 设计批准申请人必须就本规范作为认证计划的一部分的使用，寻求其各自CAA机构的个别指导。有关哪些CAA监管机构已接受本规范（全部或部分）作为遵守其小型飞机适航法规（以下简称“规则”）的一种方式的信息，请参阅ASTM F44网页（www.ASTM.org/COMMITTE/F44.htm），其中包括CAA网站链接。 附件A1 将本规范中描述的合规方式映射到EASA CS-23修正案5或更高版本，以及FAA 14 CFR第23部分修正案64或更高级别。 1.3 以国际单位制或英寸-磅单位表示的值应单独视为标准值。每个系统中所述的值不一定是完全等效的； 因此，为确保符合标准，每个系统应独立使用，两个系统的值不得组合。 1.4 本标准并不旨在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，并确定监管限制的适用性。 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 covers international standards for the environmental system aspects of airworthiness and design for “small” aircraft. 1.2 The applicant for a design approval must seek the individual guidance of their respective CAA body concerning the use of this specification as part of a certification plan. For information on which CAA regulatory bodies have accepted this specification (in whole or in part) as a means of compliance to their Small Aircraft Airworthiness regulations (hereinafter referred to as “the Rules”), refer to the ASTM F44 webpage (www.ASTM.org/COMMITTEE/F44.htm), which includes CAA website links. Annex A1 maps the Means of Compliance described in this specification to EASA CS-23, amendment 5, or later, and FAA 14 CFR Part 23, amendment 64, or later. 1.3 The values stated in either SI units or inch-pound units are to be regarded separately as standard. 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.