1.1 本规程旨在为使用AM生产零件的航空行业分配零件分类。 1.2 本规程适用于ISO/ASTM中定义的所有AM技术 52900 用于航空。 1.3 本规程旨在为下游文件中的AM部件建立度量。 1.4 本实践并不旨在为任何下游流程建立标准，而是建立这些流程可以使用的度量。 1.5 部件分类度量可用于AM航空部件的工程、采购、无损检测、测试、鉴定或认证过程。 1.6 本实践中的分类方案建立了一致的方法，以定义和传达与AM航空部件相关的故障后果。 1.7 本惯例不旨在取代适用法规或政策的要求和定义，包括但不限于 附件A1 . 1.8 表A1.1- A1.3 将现有法规和指南与本文建立的四个部分类别保持一致。然而，这种对齐不应被解释为现有法规之间的对齐。 1.9 材料或工艺，或两者，通常不影响零件故障的后果，因此，本文件中定义的分类方案可在AM之外使用。 1.10 本标准的用户不应假设监管机构认可本标准为公认的合规性。 1.11 本标准并不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。 1.12 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 practice is intended to be used to assign part classifications across the aviation industries that use AM to produce parts. 1.2 This practice is applicable to all AM technologies defined in ISO/ASTM 52900 used in aviation. 1.3 This practice is intended to be used to establish a metric for AM parts in downstream documents. 1.4 This practice is not intended to establish criteria for any downstream processes, but rather to establish a metric that these processes can use. 1.5 The part classification metric could be utilized by the engineering, procurement, non-destructive inspection, testing, qualification, or certification processes used for AM aviation parts. 1.6 The classification scheme in this practice establishes a consistent methodology to define and communicate the consequence of failure associated with AM aviation parts. 1.7 This practice is not intended to supersede the requirements and definitions of the applicable regulations or policies, including but not limited to the ones listed in Annex A1 . 1.8 Tables A1.1- A1.3 align the existing regulations and guidance with the four part classes established herein. However, this alignment should not be construed as an alignment of the existing regulations to each other. 1.9 The material or process, or both, in general does not affect the consequence of failure of a part, therefore the classification scheme defined in this document may be used outside AM. 1.10 The user of this standard should not assume regulators’ endorsement of this standard as accepted mean of compliance. 1.11 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. 1.12 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.